The 7805. The pick coil responds to the wheel rotation and triggers the CDI to generate the high voltage pulses at the same rate as the wheel rotation. I removed the resistance at the base of 2N3055 , since the led itself drops the base voltage to about 0.75v , which is good enough for the transistor. [11] The power rating (in free air at 25C) is also subject to variation, from 500mW to 625mW; the latter now being the most common. The BC547 variant rarely is available in the "C" gain group, and the BC549 rarely in the "A" gain group. WebHistory and usage. The circuit shown in the following link worked very nicely for me: You can make this circuit exactly as it's shown and then compare it with your designs and check why this one works and your designs don't.I think the gate trigger could be the culprit. Ok, but in that case both the xformers should be changedbecause the output from the first would the input for the 2nd. i found a 60Ohms resistor will this work?http://www.allelectronics.com/category/530300/resistors/power-resistors/1.html. to provide the wanted PPS. The short low voltage pulse drives an SCR which discharges or dumps the capacitor's stored voltage into the primary of an ignition transformer or coil. Examples are given for NPN transistors 2N2222, 2N3055, 2N3904, BC547, TIP31, TIP31A, TIP31C, TIP41, TIP41A, TIP41C and PNP transistors 2N3906.. Formulas and math used for the transistor base resistor Hi, you can build the one that's shown in the above article, it's a universal type and is suitable for all 2/3 wheeler vehicles. Transistor Database. I used 2N3055 , because I use 3 (12V 40A) heavy duty relays in parallel for the three phase connection. Thanks for ur rply sir i did a another one and connected it and it was working. The type was registered by Motorola Semiconductor in the mid-1960s, together with the complementary PNP type 2N3906, and represented a significant performance/cost improvement, with the plastic TO-92 case replacing metal cans. We can assume the circuit built by Mr. Vincent to be correct since it is responding well at lower RPMs, and failing at higher RPMs. if you have any difficulty with the testing of the circuit, do feel free to post it here, I'll try to solve it out for you. However the voltage from the alternator cannot be directly fed to the ignition coil because the source may be low in current, therefore we employ a CDI unit or a capacitive discharge unit for collecting and releasing the alternator power in succession in order to make the output compact and high with current. Im thinking of using high power mosfets instead because of their lower drive demands, and higher operating voltages. Please check and confirm, if I have understood your circuit correctly. It was introduced in the early 1960s by RCA using a hometaxial power transistor process, transitioned to an epitaxial base in the mid-1970s. In both the designs, the cathode of the SCR goes directly to the ground. This question is brought about because of the rarity of factory replacements and the high cost of aftermarket replacements. Peak output current: The TO220 version of 7805 delivers 1A with a normal heatsink, but it could deliver up to 1.5A by mounting it to What would be the minimum voltage needed for the trigger? Web2N3055/D 2N3055(NPN), MJ2955(PNP) Preferred Device Complementary Silicon Power Transistors Complementary silicon power transistors are designed for generalpurpose switching and amplifier applications. Cross Reference Search. You can upload the image in any free image hosting site and provide the link, Ill check it. You can very easily build a 12V high current pulse generator using an IC 555 PWM circuit as shown in the following diagram: Let me know if you have any further questions! Will it be okay, to use it with a 555 astable oscillator at 50-60Hz + TIP31C? WE will surely wait for the new article. I cannot see the following post (+ posts after this) in your blog despite of repeated reloading of the page: Thank you Swagatam + Abu-Hafss Thank you Guys for replying so quickly to my question!Abu-Hafss- Are you asking for a picture of the magneto itself or a picture of the coil and how it is wrapped under the protective sheathing? WebThe 2N3055 is a silicon NPN power transistor intended for general purpose applications. If only the 2nd is changed, the input wattage would remain the same and hence the output would remain the same. The high voltage is rectified and the resultant DC charges a high voltage capacitor. Thank you David for posting your question and trusting my knowledge. Al final del tutorial encontraras el datasheet LM317. Hi Swagatam Thanks for all your help. Hi Steve, yes the 5V will serve as the triggering voltage from the hall effect, and the 220V AC from the alternator can be used for the CDI. I'm gonna give this a try, If it doesn't work at least I'll have fun trying it . Silicon NPN Power Transistor Siemens Semiconductor G 2N3055: 83Kb / 4P: Hi Swagatam Im just trying to work out how to obtain the 12 volt signal from the pulser coil of a Yamaha DT200LC to input to your CDI unit. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. I take it the first diagram in correct and the schematic is wrong? Hi! This does not happens every time. What is the gauge of the wire that you have used? In this post we discuss the circuit for a simple, universal capacitive discharge ignition circuit or a CDI circuit using a standard ignition coil and a solid state SCR based circuit. WebThe 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. For that particular reason, the output is around 600V as long as the input voltage is between 12V-30V !!! If this circle shaped part has four legs then it could be a bridge rectifier.. Sir I want to make all Indian bike cdi unit can u provide me all solution like making n testing source.9015693522. may be the 1N4007 are not able to handle the high speed pulses and not conducting quickly to charge the capacitor fully.you can try replacing all the 1N4007 diodes with BA159 and check the response. WebPenulis: Drs.Hendro Hermanto,MT., , Penelaah: Rugianto, SPd., MT., , Pusat Pengembangan dan Pemberdayaan ), or a direct way to reply to a particular post. 12v car subwoofer amplifier circuit diagram pdf.Led display digital Voltmeter 500W low cost 12V to 220V inverter Metal Detector 2N3055 Power Amplifier Low pass filter - Subwoofer 200W audio amplifier Basic UPS Power Supply 100W RMS Amplifier LED Torch High And Low Voltage Cut Off With Time Delay. When a trigger is applied the SCR dumps the charge across the ignition coil primary. This website is using a security service to protect itself from online attacks. To connect to the CDI unit, I removed the capacitor + diode and connect the mosfet+coil directly to HV input of the CDI unit. The 2N2222 is considered a very hi swagatam, can we replace the bt151 with a 2n3055 instead? Anyway, I understood your required CDI is 2-wired self-triggered type used on motor-bicycles. One more point.When I switch on the circuit the LED connected to the pin#3 of 555 would indicate the oscillation. WebThe 2N3055 is a silicon NPN power transistor intended for general purpose applications. can you please show and explain a circuit diagram for a scooter cdi that has the ability for advancing the ignition sparking for when the engine speeds up, Sorry, I do not have a CDI circuit with an ignition advancing feature, @Marcelo Sorry, but no such luck. /Sren. Thanks! The voltage at primary is 24VAC but the voltage at the secondary is less than a volt! Features DC Current Gain hFE = 2070 @ IC = 4 Adc CollectorEmitter Saturation Voltage VCE(sat) = 1.1 Vdc (Max) @ IC = 4 Adc Thanks Desmond, glad you liked and bookmarked this site! No doubt about it, and you can easily do it by assembling the little number parts indicated in the diagram, and simply hook them up with your bike's electrical. While searching for pdf schematics and details of the GP7 I discovered a guy called mimi2008 who did a redesign of the original Trace Elliot GP7 PCB board, he moved a few components Sure! hi sir,i want to build this circuit,but my question is how can i connect this,,is it alternator ang magneto are the same?i found a magneto coil to rectifier on my bike,where i connect this from your circuit?pls, yes alternator refers to the magneto in your bike. Referring to the above capacitor discharge ignition circuit diagram, we see a simple configuration consisting of a few diodes, resistors, a SCR and a single high voltage capacitor. Forum Themen Beitrge Letzter Beitrag; Guten Tag lieber Besucher! . you can try the following circuit,but could be difficult for you considering that you are very new in this field: https://www.homemade-circuits.com/2013/10/universal-multi-spark-enhanced-cdi.html. I have a 12V 70 amp alternator in the car. no lights or no battery, just want it to run on a field its an ac unit. /Sren. For SCR, 2P4M also work perfectly in 50-100cc bikes. Im from Germany (Bavaria) Cant translate English on the PC. 2) As far as the 100mA transformer is concerned, I simply followed your circuit. The type was registered by Motorola Semiconductor in the mid-1960s, together with the complementary PNP type 2N3906, and represented a significant performance/cost improvement, with the plastic TO-92 case replacing metal cans. However, as reported on Feb. 15th, when I fed 136V thru CDI to the new coil the voltage dropped to 40V and there were no sparks. I am quite gifted mechanically but alas, electrickery has me by the shorts. Silicon NPN Power Transistor Siemens Semiconductor G 2N3055: 83Kb / 4P: The engine cranks and all works except I do not have spark. WebThe 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. WebLM317 LM339 MAX232 NE555 LM324 8051 7805 2N3055 LM358 2N2222 74LS138 TDA7294 TL431 IRF540 1N4148 G45A. I wana ask you one question.And question isDo you built any plasma ignition circuit?As you know plasma ignition very much powerful spark.and its circuit takes dc HV from battery. While searching for pdf schematics and details of the GP7 I discovered a guy called mimi2008 who did a redesign of the original Trace Elliot GP7 PCB board, he moved a few components figure its beginning, but perhaps my lack of understanding of SCR (Q1) requires spoon feeding. 5V will be enough for triggering the SCr, but the other supply which is supposed to go to the capacitor and the ignition coil must be around 60 to 100V, otherwise the spark strength can get affected causing inefficient combustion of the engine. Therefore more higher voltage will result strong spark. The set up was tested on table, and therefore the trigger voltage is acquired from a 12V 50Hz AC. The CDI unit is having 400V capacitor whereas, the boost circuit is producing 610V. Cross Reference Search. I apologizes all this circuitry stuff is pretty new to me.thank you for your dedication and your willingness to share your vast knowledge! Electronic advance, more current etc.Thanks very much. I think nothing should be omitted in the circuit since the design is tested professionally in automobiles with perfect results, so I wont recommend modifying anything in the design. If I happen to find anything useful will surely let you know. Poorly designed circuit, or a case of the money guys wanting the engineers to cheapen a better design. I have looked all over and can not find a replacement module so this is a last option. Is it an option? Hi I have a honda xr200 1981 the cdi is buggered will I need to get another one or is there a way to bypass this? For this I need a pulse generator high current low pulse generator which is described by other providers with ultra-short pulse generator. HI Swaga, just wondering the BT151 leg configuration>the BT151 Chip number label facing us: 1st leg-cathode(positive out) , 2nd leg-anode (positive enters), 3rd leg-gate..is this correct? I hope you can wait for a few days. In that case, you can use your points and the capacitor together with a 100/5W resistor, in place of the trigger coil. Click to reveal If you have any ideas that will help please blueprint the for mentioned schematics, I will be more than grateful for any help. It is a transistor type of enduring popularity. Will this schematic work on it? Transistor Equivalents for the substitution of modern. Very informative and appreciate the detailed component list. En este tutorial veremos el circuito LM317 para configurarlo como una fuente variable de 1.25V a 30V. Its numbering follows the JEDEC standard. Its mean this SCR BT151 competible for 15000 RPM, Dear sir,My bike is honda cd 125 and its 10000 rpmand its ignition build for 10000 rpm.i am customize engine for 15000 rpm and its require improved ignition.does above circuite use for this 15000 rpm. Enquiries suggest that it is the capacitor and that the early capacitors failed because they dried out, is this still a problem. On the picture I sent you the link for it shows a YL and YL-BK leaving the magneto but does not show where they go. Here is the link to q screenshot of the ignition circuit. here is a link to one like mine i found on ebay. how to make a adjustable cdi for 180cc 4 stock or can i modify the existing, Hi Do you have a CDI circuit that will work for my +ve earth motorcycle which will run from 12 volt battery and points. C4 is a non-polar capacitor, the circuit is intended for all 2 or 3 wheeler automobile engines, if your system similar to these engines then it'll surely work. However you will need a pickup coil triggering for the operations, so you may contact a qualified mechanic to get it installed in your bike too. Since 1999 Welcome to over 500 posts and to over 50 articles on amplifiers, tube-based preamps, crossovers, headphone amplifiers, single-ended amplifiers, push-pull amplifiers, Circlotron circuit design, hybrid amplifiers, cascode circuits, White cathode followers, grounded-cathode amplifiers, tube series regulators and shunt Hi, the body polarity is irrelevant here. here is a link to one like mine i found on ebay. Al final del tutorial encontraras el datasheet LM317. 25 INVERTER BLOCK DIAGRAM 12v solar inverter battery charger simulation of micro wiring diagram for 600 watt teardown the power from 800va pure sine wave s panel 3 phase controlled drm126 hybrid kit all in one circuit build 200w fuji electric transformer less grid tie without dc to 230v ac wire panels series vs parallel page 2 supply 500w using 5 kw high efficiency fan a , benjamin moore revere pewter kitchen cabinets. Is it like a normally closed circuit between anode to cathode so that while capacitor is charging, anode is grounded through cathode and then the trigger pulse into gate briefly breaks that ground sort of like when points open? Necessary cookies are absolutely essential for the website to function properly. Please Guide me as this is very interesting topic for me). I checked the coil and found that the secondary has very high resistance in M-Ohms, maybe due to the high tension wire, though it worked perfectly in the bike. it would be better to replace it then. Any kind of sound from a solid state circuit is not good, you can check if anything's sparking or arcing at any place within the pCB. increasing voltage or current won't do any good for enhancing the automobile performance because the spark plug gap is too small and will respond equally to a low voltage or a high voltage..The ignition coil and the circuit is already powerful enough, to produce sparks 1/2 inch long.it implies that you could try altering the spark plug gap and make it about 1/2 inch long,,,,this alteration could help the cause..because longer spark would mean longer area covered by the spark inside the chamber influencing bigger explosions. here there are some pictures of my circuit, maybe any one can identify any defect.https://www.dropbox.com/s/1uc9d2llf5a84tg/IMG_20160923_114945.jpg?dl=0https://www.dropbox.com/s/6b7s5617tx9v2mz/IMG_20160923_114950.jpg?dl=0https://www.dropbox.com/s/mscmdgluseyfw2j/IMG_20160923_114954.jpg?dl=0If it is possible I'll continue this afternoon working on it.Thanks. Or do I need to have a bigger transformer? It seems to be quite difficult in getting the 555 boost circuit to work as HV supplier to a CDI. First, the 7805 regulators should be heatsinked so it is capable of dissipating the heat in the worst condition. Understanding Motorcycle Voltage Regulator Wiring, How to Manufacture Automobile Electronic Parts and Earn a Handsome Income, Motorcycle Regulator, Rectifier Tester Circuit, Self Adjusting Automobile Headlamp Circuit, 4 Solid-State Car Alternator Regulator Circuits Explored, Simple Ignition Code Lock Circuit for Automobile Protection, https://drive.google.com/file/d/1IStxAoNOJdPuamQ17LDsBas1guowouHo/view?usp=drivesdk, https://i.ebayimg.com/images/g/1kEAAOxyRHdRzMNq/s-l500.jpg, http://www.allelectronics.com/category/530300/resistors/power-resistors/1.html, https://dl.dropboxusercontent.com/u/20969135/Pulser%201st%20negative.jpg, https://dl.dropboxusercontent.com/u/20969135/Pulser%201st%20positive.jpg, https://www.dropbox.com/s/1uc9d2llf5a84tg/IMG_20160923_114945.jpg?dl=0, https://www.dropbox.com/s/6b7s5617tx9v2mz/IMG_20160923_114950.jpg?dl=0, https://www.dropbox.com/s/mscmdgluseyfw2j/IMG_20160923_114954.jpg?dl=0, Small Signal Transistor(BJT) and Diode Quick Datasheet. Typical output voltage: A typical 7805 delivers 5V. I think the pick-up coil output has something to do with the issue. Thanks! yes according to me 15000 RPM will not be a problem for this circuit since it uses a fast, and advanced SCR for the switching. spark starts at beginning of gate pulse or end of gate pulse? Most have a way to say I need a transistor like this: Vco = 40 to 60V, Ic = 100 to 200mA, TO-92, 100 to 400mhz, NPN, gain 400 to 600,30-Jan-2021 in this video i discussed How to find Equivalent or Substitute of MOSFET or Transistor / SCR / IGBThow to find replacement #equivalent international financial management assignment, why is everyone leaving salem on days of our lives, 2 player games unblocked friday night funkin. it is important I also stress that we endeavor to investigate such devices at these times when the whole world is reliant on the $$$ guzzling oil and no one gives much thought about clean energy concepts seriously, I appreciate your thoughts Mr. Fidel, you are right, somebody must take serious initiative and prove the world about the potentials of these efficient machinesin my free time i would certainly want to go ahead and test one of those. thanks again for your assistance!one more Q: can all of the components that are required for this build be purchased at radio shack? WebEn este tutorial aprenders a configurar su circuito para disear una fuente de voltaje. However you can do one change, just place the diodes with BA159. Thank you. That's all, this would conclude the installing of the explained CDI circuit, I have a need for an ignition system for a 6 cyl 2-cycle engine. And then when I disconnect the transformer, it would resume the oscillation after some time. The voltage being very high in potential starts arcing across the points of the spark plug, generating the required ignition sparks for the ignition process. Hi, without a trigger coil no CDI can work for a motor bike as far as I knowso the above circuit will also not work without a trigger from a pick up coil. The ignition coil, which is very popular and we all have seen them in our vehicles is especially designed for the above stepping up of the input source voltage. The transistor used in this amplifier is a 2N3055 is used as a switch for inducing voltages in response to the input signals into one half winding of the transformer. If i want to use this ignition in a 4 stroke 90 degree V twin, can i just use 2 pickup coils 90 degrees apart, hooked to 2 separate ignition boxes? Hi Swagatam First Let me say I love your site and have bookmarked it. This ignition is done through an electrical process by generating high voltage electrical arcs. Two voltage inputs are fed to the electronic CDI system, one is high voltage from the alternator in the range of 100 V to 200 V AC, other is a low pulse voltage from a pickup coil in the range of 10 V to 12 V AC. I was wondering since it is a wasted spark system in which two plugs fire simultaneously can I build my own cdi to use in place of the ic igniter that was used originally? The 2N2222 is considered a very The pickup box normally has an iron cored coil which is triggered by a magnet fixed with the engine wheel, as the wheel rotates the magnet moves past the pick coil, and this induces a magnetic pulse in the coil, and this pulse output is used as the trigger for the CDI circuit. Now I await your valued comments. Load regulation: The load is typically regulated to within 10mV and less than 50mV. Examples are given for NPN transistors 2N2222, 2N3055, 2N3904, BC547, TIP31, TIP31A, TIP31C, TIP41, TIP41A, TIP41C and PNP transistors 2N3906.. Formulas and math used for the transistor base resistor Herzlich willkommen im Forum fr Elektro und Elektronik. No problem Steve! The following video clip shows the basic working process of the above explained CDI circuit. WebEn este tutorial aprenders a configurar su circuito para disear una fuente de voltaje. Thanks! Required fields are marked *. It is a solid state CDI. Hi sir.Recently I made this circuit on a 2stroke motorbike, 50cc, improved performances for amateur racing. Hello Swagatam, I came to this very helpful blog, while researcing a CDI for a medium displacement two stroke bike, and I have a very high regard for your availability.Could you please elaborate a little, on the last statement of your last reply (July 30).The engine I will hopefully use the CDI is of this kind (high power to weight ratio), so could you hint to the posssible paths to take, to achieve such an improved (battery-less) ignition? Silicon NPN Power Transistor Siemens Semiconductor G 2N3055: 83Kb / 4P: WebAll Transistors Datasheet. You can try the fence charger design and see if it works for you or not. If D1 is blocking voltage to ground, couldnt that be omitted too? i.e. But the problem persists.Thanks. Upon checking the waveform images, I found that increasing speed results in the increase of amplitude or the peak voltage output from the pickup, so how this could be affecting the SCR conduction is something that needs to be diagnosed. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds.It was originally made in the TO-18 metal can as shown in the picture.. The back emf generated across the winding of the transformer is effectively dumped over the speaker generating the required amplifications. WebLM317 LM339 MAX232 NE555 LM324 8051 7805 2N3055 LM358 2N2222 74LS138 TDA7294 TL431 IRF540 1N4148 G45A. 523. simulating the capacitor discharge pattern could be little difficult, however i am assuming the diode to be reversed biased, because practically the circuit is working perfectly so it means everything is right in the circuit. Firs,t I checked the HV supply in a bike, I found it to be 125VAC. Hi Fidel, BT151 is a thyristor, which is completely different from a transistor and therefore the two cannot be replaced with each other.no, I haven't yet tested the bedini charger, however i feel it could be true since it uses a flywheel concept and we all know how efficient a flywheel can be in terms of output vs input power. Devices registered to this Pro Electron number must have the following minimum performance characteristics:[9]. 12v dc to ac inverter circuit diagram pdf that will work with LED light. I have a problem with my Cdi motorcycle ..I want to modified the Cdi because my rpm around 7500 ..I want more ..normally which component I must be to change ? sorry it will be difficult for me to understand and trace your wiring diagram without a practical test, you may have to do it yourself. The resistor is to be connected to 12V from ignition. i do hope someone can help me with this problem ,thank you very much for reading this stephen. I could get only 130V which, if fed into the CDI results nothing. I m very far away thats why i can't get it new one its not available here i m going to import it i gonna bebe so expensive what should you suggest methanks, Hassan, The above CDI is a universal model which is presently being used in reputed Indian motorcycle brands such as Bajaj, and Hero Honda, so you can build this CDI for your motorcycle also and use it for the time being until you find the original version for your specific model. WebLM317 LM339 MAX232 NE555 LM324 8051 7805 2N3055 LM358 2N2222 74LS138 TDA7294 TL431 IRF540 1N4148 G45A. Can i convert it to cdi and use your circuit? Therefore the voltage needs to be stepped up many thousand folds in order to reach the desired arcing level. All Diodes = 1N4007 Coil = Standard two-wheeler ignition Coil. Since the trigger is from a 50Hz source, the sparks can be seen arcing at the rate 50Hz. Examples are given for NPN transistors 2N2222, 2N3055, 2N3904, BC547, TIP31, TIP31A, TIP31C, TIP41, TIP41A, TIP41C and PNP transistors 2N3906.. Formulas and math used for the transistor base resistor Peak output current: The TO220 version of 7805 delivers 1A with a normal heatsink, but it could deliver up to 1.5A by mounting it to In addition, the input voltage should be more than the maximum output voltage of about 3.5V. The SCR specs are too low, it will blow instantly, the triac specs look OK, it can be tried, might work, NTE5466 looks much better, you can definitely try that. This group of NPN transistors share many specifications and characteristic curves, but differ in voltage ratings - the BC546 and BC547 are essentially the same as the BC548 but selected with higher breakdown voltages, while the BC549 is a low noise version, and the BC550 is both high-voltage and low-noise. The triggering signal must come from a pickup coil, or any arrangement that creates a single 5V or 12V pulse in response to each rotation of the wheel. Some models may provide from 4.8V to 5.2V. replacing 2N3055 x 2 with TIP31C x 2 and 12-0-12 200mA transformer. - Transistor C 548 C im I have used a 1uf/450V capacitor instead of 1uf/250V because there is no available 1uf/250V on the store. S8050 is an NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at the ground and will be closed (Forward biased) when a signal is provided to the base pin. others won't last for very long, ignore the ground connection of the CDI, meaning don't connect the indicated line of the CDI with the bike ground or body.and instead connect the two wires from the alternator with the 230V input and the ground line of the CDI. The circuit given above is very much capable of firing 3 to 4 times per second, provided the pickp coil triggers the circuit at this rate. Best regards Desmond Tutu. It is a transistor type of enduring popularity. Hi, I used 1N4004, I think it's equivalent to BA159.Also when, the r.p.m. The driver stage consists of a well balanced high voltage transistor stage which are necessarily positioned for driving the output power mosfets. Web- im Elektroforum - - Elektronik und Elektro. Im guessing this based on the fact the bike will run without a battery fitted so presumably no power is being sent to the pulser coil. 2N2222 might be too feeble to handle the current required to drive three such relays. 2N2222 might be too feeble to handle the current required to drive three such relays. Anyway, I bought a new one same the one shown in your drawing. Can the same voltage from the alternator to run both the capacitive power supply as well as supplying the voltage to the CDI capacitor C4? The action generates a magnetic induction inside the coil and the input from the CDI which is high in current and voltage is further enhanced to extremely high levels at the secondary winding of the coil. Typical output voltage: A typical 7805 delivers 5V. This set-up is based on your article of enhanced CDI for 2-wheelers. Hi Mansoor,, It can be tried but forcing 400V into the coil could make it hot. sine egs002 1000w schematics 3000w. It might work with your bike at low RPM but at high RPM it will fail to synchronize the sparking. Therefore I could not understand much the mechanical modifications you did in your bike. Web2N3055/D 2N3055(NPN), MJ2955(PNP) Preferred Device Complementary Silicon Power Transistors Complementary silicon power transistors are designed for generalpurpose switching and amplifier applications. In an attempt to conserve battery power, what would be the lowest freq that the charging oscillator can operate at to provide full charge at the 3-4 PPS? That's a very interesting and useful link, thanks very much! Hi, i have a honda spada vt250 v-twin engine, i got a problem with my cdi some parts are burn and i dont know the value, do you have any idea with this or do you have some schematic diagram with it..? OK I am glad it's working for you! If you have no experience of programming/burning micro-controllers and want to get the job done without any hassle/frustration, I would suggest you to buy the original or compatible CDI from eBay or AliExpress. The PNP counterparts of the BC546 to BC550 are the BC556 to BC560 respectively, i.e. En este tutorial veremos el circuito LM317 para configurarlo como una fuente variable de 1.25V a 30V. 1/4W, 1/2W, 1W or bigger? Webonsemi supplies a broad portfolio of bipolar NPN, PNP, and complementary transistors, including Low V CE(sat) transistors. kill switch . Typical output voltage: A typical 7805 delivers 5V. what is the maximum voltage can produced by normal bike engine alternator.. like pulsar 150 (2007 model), if alternator is faulty what is the minimum voltage required to produce such arcs? Please see the difference between two wave patterns:https://dl.dropboxusercontent.com/u/20969135/Pulser%201st%20negative.jpghttps://dl.dropboxusercontent.com/u/20969135/Pulser%201st%20positive.jpg. Thanks! I need a cdi circuit for a kymco quannon 125, it burns to me original, I want to replace the burned parts, so I need a circuit of the capacitors, transistors, relays their strengths and specifications. El regulador LM317 tiene distintos circuitos de configuracin. Otherwise you may have to build one of the designs explained in the following post: Okay great. Thanks David, the ebay image is not opening for me. Like for example here in my country is very hard or very expensive to get original or oem parts, so I managed to make the bike rub without a cdi but I feel it is not as precise as it should, and the trial and error cost me a few more parts. Best Wishes Peter. ElecCircuit - All Rights Reserved, a 7805 Variable Voltage Regulator circuit, Experiment TL431 circuits as shunt regulators and more, Experiment increase current of 7805 with 2N3055 transistors, Constant current circuit using transistors, Microcontroller | Digital power supply circuit, 5V 3A using LM350 or LM323, High quality tone control circuit diagram. . 112 i have a problem with a honda 1980 cg125 field bike im trying to fit a cdi to it. If that is the case, you might need to make some modification in the circuit because this circuit is designed to fire on a positive pulse. That is slightly different from the one discussed in this article. the type numbers are higher by ten. Q3) at low revs, if i want to multiple spark, how long for cap to recharge before next pulse? Some manufacturers specify their parts with higher ratings, for example the Fairchild 1997 datasheet (547ABC, Rev B) for the BC547, sourced from Process 10 gave 500mA as the maximum collector current, while their datasheets dated 2002 have dropped the current rating to the standard 100mA. WebThey should not be too small though, as the resistor will be pulled to ground via the diode when the opposite transistor switches on. This transistor is low-cost, widely available and sufficiently robust to be of use by experimenters and electronics So a BC548 might have a current gain anywhere between 110 and 800, but the gain of a BC548A would be within the range of 110 to 220. https://drive.google.com/file/d/1IStxAoNOJdPuamQ17LDsBas1guowouHo/view?usp=drivesdk. I dont think I understood the second part of your question, regarding the lowest frequency of a charging oscillator. you can use this same design which is explained above, because if the RPM is 7500, your pick up coil will generate the triggering signals at this rate which will correspondingly trigger the coil at 7500 pulse rate. That's great! ist time on the internet ! I am not talking about the CDI unit (it is untouched). So drying out of the capacitor may not be possible. Thanks very much , Glad you liked the post! Thanks again! WebA transistor is a semiconductor device used to amplify or switch electrical signals 2N3055 is a silicon npn power transistor, 2N1301 is a pnp germanium switching transistor. I made this like cdi by bigger thyristor and without R4 resostor. I have not measured the output of the magneto to the CDI that comes with this kit but I wish to get the best performance possible. The generated voltage at the secondary of the coil may rise up to the level of many tens of thousands of volts. R5 is operating as a part of a voltage divider bringing the voltage at the gate down to 7.69volts but the BT151 will handle the 12volts from the pickup without needing to drop the voltage. [citation needed]. You mentioned, you are new to electronics. Assuming the (-) get tied to ground? Hello, I have a sea doo and the mpem (multi purpose electronic module) burnt a diode from a stator over charging it. which is better to use a ceramic or ?? white is a mass. that's 12 sparks per 360 degrees of crank rotation. Yes you can use the above circuit for your bike. Thanks you Alvaro, you can definitely use the above design for your bike, it should work. It's one and the same, to me your diagram looks more confusing:) because in my diagram the bridge is well isolated from the transformers and makes it clearer to understand that it's been installed for powering the 555 circuit. (I'm not good at all on that software to make circuit)If u have please share with usRegardsOtto V.Congrats for this page! Answering your question, the shape of the CDI unit is not important. Web- im Elektroforum - - Elektronik und Elektro. And the current from the power supply should also be rated high enough for the CDI coil to respond. you can try the modified version of the above for achieving the timing feature, https://www.homemade-circuits.com/2013/01/make-this-enhanced-capacitive-discharge.html. The CDI unit works perfectly in its place. WebGday RMC, just been having a play with this circuit and thought that 2N3055s are kind of an ugly transistor due to their high base drive demands and low (100V) max operating voltages. The pickup box is magnetic thing inside as metal gets attracted to it. 1) The coil is pulled to ground by the Mosfet and produces a positive voltage spike when the Mosfet turns off. So basically if your bike possesses the above then you could easily exploit the above design in your favor. The BC548 is supplied in a standard TO-92 3-pin package. Would a divide By circuit be a better option? Look the Chinese and Indian CDI : Hi Cleuzio, Reputed Indian brands are one of the best, may be you got a duplicate version. But my question is how do certain cdi's defer from other brands? Junction Temperature maximum 125 degrees Celsius. Transistor Equivalents for the substitution of modern. hi nhark, the problem could be in the circuit assembly or the wiring connections with your bike. Hello friend, I am sorry at the moment I do not have any specific design for the mentioned model, so wont be able to help in this regard. if you need a picture of the coil of the magneto let me know and i will cut off the sheathing on an extra one i have and send you a link. Features DC Current Gain hFE = 2070 @ IC = 4 Adc CollectorEmitter Saturation Voltage VCE(sat) = 1.1 Vdc (Max) @ IC = 4 Adc yes making the magneto stronger would hep generating stronger sparks, so you can either modify the winding or simply procure a mobike magneto and replace it with the existing one. D3 ensures that the left side of the 1.5uF cap will never go more than the voltage drop of D3, around 0.7V negative. WebEn este tutorial aprenders a configurar su circuito para disear una fuente de voltaje. Q1) what exactly is the SCR doing? Also, What kind of capacitor do you use? 1N4007 should work perfectly. I want to know if this cdi will work or not ? WebThey should not be too small though, as the resistor will be pulled to ground via the diode when the opposite transistor switches on. A letter suffix, such as "A", is sometimes used to indicate a newer variant, but rarely gain groupings. projectpoint.in/thumb.php?f=image/data/CFR_1W_56E.jpg&w=400, 60 ohms will work but try to get a CFR type as referred in my above comment, a wirewound type would also work but it's not necessary. 4 pulses/second equals 240 pulses/minute no problem for a motor, or rather, probably not possible to keep a motor idling that low. Im about to construct it but I have a couple of questions I hope you can answer? By the way 11500 RPM looks very high, not sure whether or not this CDI will be able to handle it. En este tutorial veremos el circuito LM317 para configurarlo como una fuente variable de 1.25V a 30V. Since 1999 Welcome to over 500 posts and to over 50 articles on amplifiers, tube-based preamps, crossovers, headphone amplifiers, single-ended amplifiers, push-pull amplifiers, Circlotron circuit design, hybrid amplifiers, cascode circuits, White cathode followers, grounded-cathode amplifiers, tube series regulators and shunt Thanks for sharing this post. The main device which is used as the switching agent in a buck converter could be in the form of a mosfet or a power BJT (such as a 2N3055), which is configured to switch or oscillate at a rapid rate through an integrated oscillator stage with its base or gate. hall effect/ transistor can be used for triggering the SCR, however it's more simply done directly through the AC received from the alternator 12V coil, as depicted across the diagram output terminals. We use cookies on our website to give you the best experience. Transistor Database. you can use 1/2 watt resistors although 1/4 watt would also work. I removed the resistance at the base of 2N3055 , since the led itself drops the base voltage to about 0.75v , which is good enough for the transistor. Hi, 1N4004 is not a high speed diode, but anyway high speed diode may not be required.sorry I mistakenly related the charging of the capacitor with pickup pulse, actually the pick pulse is related to SCR triggering not the charging of the capacitor. I used 50 turns of 21 SWG (0.8mm) on a iron powder toroidal ring. The action you just performed triggered the security solution. Once hooked up and initiated, the High tension wire should start generating the required high voltage for the spark plug. I shall post an article for that CDI but it might take a week or so, as I am bit engaged these days. The output is to be connected to the Pulse Input of a CDI. Hi Abu-Hafss, yes a high speed may not be required since the RPM is not in the kHz range. "A" indicates low gain (110 to 220, typically 180) at 2mA collector current, This page was last edited on 21 July 2022, at 02:38. Hi i am hassam from kashmir . To help you remember the pinout of the NPN and PNP transitors: NPN transistor and PNP transistor with base resistor. This transistor is low-cost, widely available and sufficiently robust to be of use by experimenters and electronics Like I would like to apply this on your article to my yamaha dt125r but my bike is a bit of a transformer because it no longer has many stock parts. However, the problem I reported earlier occurred when the 555 was oscillating with the transformer and the output 136V. Thank you Swagatam Majumdar. Ferrite toroidal rings are the black one whereas the iron powder toroidal rings are made with iron powdermore details could be seen here: http://www.inductors.ru/pdf/Doc496_Ferrite&Powder_Core_Power_Inductors.pdf. Three wires means 12V, 180VAC and common ground. Thanks. First I connected the triggering input to the output of variable frequency oscillator (max. Would you please clarify if your motor-bicycle is for normal usage or for racing? http://www.molla.org/DIY-CDI/SC-DIY-CDI-article-hires.pdf. I have a 2 stroke Yamaha L2GF 110 cc 1970's model that uses points. I need an astable operation that will provide the 3-4 pulses per second without an external trigger. The CDI version explained in the above article is the universal design which can be used for all 2 standard wheelers, Thanks for the prompt reply! WebThe 2N2222 is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It was working fine. -RF, Hi, Thank you, yes it can be, the main capacitor will need to be increased to 2uF/400V or maybe 3uF/400V, Hello Schwagant Build myself a hydrogen generator from Stangle Meyer without the use of chemicals, only with pure water. This resistor provides wetting or whetting current for the points to ensure that there is good contact between the two contact-points when they are closed. As Sawagatam said, it is not suitable because a 220F capacitor would take longer time to charge as compared to a 1F capacitor which would fully charge within nano seconds! Trigger pulse is only 5 volts in my scooter ( oskilloscope ). I referred you the above circuit to indicate how the low current 220V input from an ordinary trafo works perfectly to produce the required 20kv sparks at the output of the CDI coil. In your schematic diagram the pickup connection is single wire but on my generator engine the pickuphas two wire, how will i make the connection ? I have a Indian make yamaha Rx 135 (2stroke) and a TVS apache RTR 160.These bikes have CDi's from the company itself.Is it possible to enhance the performance of these bikes or a matter of any small cc bikes?(P.S. Transistor Database. I am not very sure about it, but you can definitely try it out, can you tell me what voltage i should expect from the small 2 stroke ignitions used in made pales boat cars etc usually 23 cc to 35 ccZenoah or chung yangalso the zenoah engines use a primary and secondary coil where as the CY uses a single coilwhat are the differences between the 2, sorry I have no idea of these bikesnormally a 2 stroke ignition would be able to produce 10kv, you can use a momentary on switch to temporarily ground the signal from the alternator, disabling spark and therefore stopping the motor. So how are you going to handle it, even if you get some working circuit? good morning Swagatam congratulations for the work presented my engine has 2 pistons with 2-stroke operation but does not have a pickup coil trigger it only has alternator ac current it is a system used in all simple moped bikes you can supply the model of the electrical diagram of the CDI? WebPenulis: Drs.Hendro Hermanto,MT., , Penelaah: Rugianto, SPd., MT., , Pusat Pengembangan dan Pemberdayaan Will this work for a Suzuki RM 125? One more thing what is inside that pickup box, does it has any magnetic switch as it is magnectic. At idle the system works ok, but when I try to rise r.p.m. Download the pdf datasheet for ATMEL548 Package SMD or Through Hole ORIGINAL ATMEL548 New original parts. Thank you ps. Or is there a better place to acquire these types of special parts that you guys go to for items such as these? (The CDI has its own diode and capacitor). However the voltage from the alternator cannot be directly fed to the ignition coil because the source may be low in current, therefore we employ a CDI unit or a capacitive discharge unit for collecting and releasing the alternator power in succession in order to make the output compact and high with current. I doubt if the pulser coil on your bike issues negative pulse first, then positive pulse. 60VA input.The output is 600V, so the amperes roughly 100mA. Oh Sorry Swagatam, I overlooked the new "LOAD MORE" bar. I hope now everything is clear. Hi Abu-Hafss,I'll remove the earth symbol so it doesn't confuse the new hobbyists. Yes the above circuit is a standard CDI circuit suitable for all 2 and 3 wheeler, basically it's an Indian, Bajaj 2E Rickshaw CDI circuit. WebHistory and usage. - Transistor C 548 C im Hi Steve, the schematic and the PCB drawing are both exactly the same. The four wires are + and 25V primary coil and + and for the trigger (according to some reading should be 3-5V). Basically, there are two types of CDI unit i.e. The output was 136V. And provide a photo of your circuit? I tried to improve the continuity of the wires, betwen the ignition coil and the capacitor and also mass, with double or triple wires, but I didn't reach any result.Comparing to the oem CDI, the spark if less powerful in this ciruit, I don't know if this could be the reason.Thank you. WebPenulis: Drs.Hendro Hermanto,MT., , Penelaah: Rugianto, SPd., MT., , Pusat Pengembangan dan Pemberdayaan Do you have any ideas that could help me sort out the issue? I think you got confused with my long message. Web2N3055 Datasheet silicon NPN triple diffused type - Toshiba Semiconductor POWER TRANSISTORS(15A,50V,115W), Mospec Semiconductor 2N3055 Datasheet, PDF : Search Partnumber : Match&Start with "2N3055"-Total : 66 ( 1/4 Page) Manufacturer: Part No. Will this circuit works for Honda CR125 1996 2 Stroke (motocross) ? Q2) suppose i want to trigger the SCR with a micro controller (arduino). You can feel free to use the concept in your papers. (TO-220) with 1A of current. The BC548 part number is assigned by Pro Electron, which allows many manufacturers to offer electrically and physically interchangeable parts under one identification. Do not use direct 220V, it can damage the diodes and the scr, you will need to isolate it using two step down trafos connected back to back. Does it work on a 250cc motorcycle?Thank you. https://dl.dropboxusercontent.com/u/20969135/CDI%20HV%20Supply.gif. Im guessing its a Hall Effect sensor and the 12volts is generated by the pulser coils when the pulse magnet passes the sensor, the sensor not having any power supply and one side of the coil goes to ground? do you think that I could open it up somehow and upgrade the components and or repair this thing so it would work? Is there a reason why you did that? These cookies do not store any personal information. 500W Mosfet Inverter 12V To 110V / 220V - Electronic Circuit inverter circuit 12v diagram soldering iron simple 2000w power circuits schematic 1000w transformer ac wiring 230v gr. The BC548 is a part of a family of NPN and PNP epitaxial silicon transistors that originated with the metal-cased BC108 family of transistors.The BC548 is the modern plastic-packaged BC108; the BC548 article at the Radiomuseum website describes the BC548 as a successor to the BC238 and differing from the BC108 in only the shape 1) The coil is pulled to ground by the Mosfet and produces a positive voltage spike when the Mosfet turns off. Thanks in advance. But I could not get any sparks at the spark plug . A letter suffix, such as "A", is sometimes used to indicate a newer variant, but rarely gain groupings. . Because the above design is an universal design and can be used for all regular bikes which are presently running on the roads throughout the world. The 100 volts input is suitably rectified by the diodes and converted to 100 volts DC. The 78L05. Thank you Swagatam + Abu-Hafss Thank you Guys for replying so quickly to my question!Abu-Hafss- Are you asking for a picture of the magneto itself or a picture of the coil and how it is wrapped under the protective sheathing? This output is appropriately arranged across two closely held metal conductors inside the spark plug. I have read a lot about Performance CDi's and want to make one on my own. If you have any circuit related query, you may interact through comments, I'll be most happy to help! I rebuilt the circuit same as yours, only changed the RC components to fixed values to get 51.50% duty cycle and 57.75 Hz frequency. Shouldn't I advise you to point out this important note in your article so that people like me may not get deceived. 2) The timing of the pulse will need to be determined through an oscilloscope and with some trial and error The timing should be such that it allows optimal charging and discharging of the capacitor. it has a twin coil it means you can try making two of the above circuits and integrate the triggers with the relevant pick up inputs and the outputs with two spark plugs. Its a 2 cylinder 2 stroke engine. thanks for the help Alvaro Tolda Lima. Thank you.. Hi, if you can show me the pics of the burnt parts I could try to identify them, if these are diodes then most probably these could be 1N4007 diodesif the size is bigger then it could be a 1n5408 etc. If I were you, I would have assembled on a 2" x 2" veroboard. yes, if there are two spark plugs, then two CDIs can be used. OK, in that case if the charging coil is able to generate around 100V to 200V this can be configured with the points marked 230V, and the pickup output can be connected with the points marked 12Vboth with respect to the ground line. (digikey.com mouser.com etc) They have a search engine for transistors. Every part has some relative function and should not be omitted. Notes: 2) If manual triggering is done with 9V battery/power supply, a faint single spark could be heard at the spark plug but not visible. Some models may provide from 4.8V to 5.2V. the "pinout", uses the same convention used by some - but not all - other TO-92 devices. If we alter some parts change for earn more voltages like 400 V to give ignition coil.like AC alternator 12v and 1amp change to direct DC 12 V battery input and circuit's change diods 1N007 change to 1N 5408 3amp doids.Does it run and genrate more voltages and more power? Right now, I am using 2 x 12V 250mA xformers. Now since the SCR is integrated to the ignition primary coil, the released energy from the capacitor is forcibly dumped in the primary winding of the coil. The above circuit should work with your 66cc bike without any problem. Or do I need to use the circuit that uses a transformer and does not use the AC from the engine? Hi dear Swagatam; Im from Brazil. But all this is some ones idea of what a equivalent is. 1/ In the first graphical design the cathode of the bt151 goes directly to ground but in the circuit diagram below that image the cathode goes to ground via an in4007 diode. Good evening, can I use a 250v 3uf capacitor instead of the 1uf one? They should be diodes with a low forward voltage drop so that the gate will be well discharged and the MOSFET fully off when the other is on. WebGday RMC, just been having a play with this circuit and thought that 2N3055s are kind of an ugly transistor due to their high base drive demands and low (100V) max operating voltages. Can any reader offer assistance? how long of pulse? They should be diodes with a low forward voltage drop so that the gate will be well discharged and the MOSFET fully off when the other is on. The type was registered by Motorola Semiconductor in the mid-1960s, together with the complementary PNP type 2N3906, and represented a significant performance/cost improvement, with the plastic TO-92 case replacing metal cans. While searching for pdf schematics and details of the GP7 I discovered a guy called mimi2008 who did a redesign of the original Trace Elliot GP7 PCB board, he moved a few components 12v car subwoofer amplifier circuit diagram pdf.Led display digital Voltmeter 500W low cost 12V to 220V inverter Metal Detector 2N3055 Power Amplifier Low pass filter - Subwoofer 200W audio amplifier Basic UPS Power Supply 100W RMS Amplifier LED Torch High And Low Voltage Cut Off With Time Delay. This transistor is low-cost, widely available and sufficiently robust to be of use by experimenters and electronics 7805 Datasheet Basic Feature. 21 swg looks OK to me.check the current through the coil and the BJT, this magnitude will actually decide the watts pushed into the ignition coil and will influence the sparks. 3) The HV Supply 4 is based on your article Simplest Inverter with 70% efficiency but this also not worked, I could get less than a volt. I am considering to replace the 2nd transformer with a 6V so that the output is around 400-440V. Im thinking of using high power mosfets instead because of their lower drive demands, and higher operating voltages. Actually I am unable to find an appropriate solution at the moment. Hi Steve, yes the trigger input to the CDI can be through a Hall effect sensor and magnet assembly on the wheel, however, a Hall effect sensor cannot work withpout an external supply. Even if the pick coil is absent, the high alternator output can be suitably dropped and used as the triggering source for the CDI coil. 3) Again, this will need to be measured using an oscilloscope through practical tests. AT22V10-25NM_833. hello. The diodes D1 and D2 are used to discharge the MOSFET gates. WebThis is an AC to AC power. I realise I will need to rectify and regulate the voltage. Since 1999 Welcome to over 500 posts and to over 50 articles on amplifiers, tube-based preamps, crossovers, headphone amplifiers, single-ended amplifiers, push-pull amplifiers, Circlotron circuit design, hybrid amplifiers, cascode circuits, White cathode followers, grounded-cathode amplifiers, tube series regulators and shunt the CDI can be used for all motorcycles as long as it is driven at a standard speed, not at racing levels. It has a pickup coil and a charging coil so this setup will work with 2 opposing firing spark plugs? locate the 200V and the 5 V to 12 V sync pulse coming out from the magneto and connect them with the relevant terminals of the above circuit, also connect the shown outputs with the ignition coil and the coil output with the spark plug.the circuit will start working immediately. But anyway, your connections seems to be OK. To me, the SCR looks doubtful. Hi Geoff, 60 years is a long time, and we cant expect more from an electronic device. The diodes D1 and D2 are used to discharge the MOSFET gates. Its numbering follows the JEDEC standard. WebAll Transistors Datasheet. I am looking to fire a coil 3-4 times a second and will be run on batt power due to location. The Coil is super cool but the mosfet gets little warm. spark advance retard could be a complex affair, I have tried to address this in the following article through a circuit concept, https://www.homemade-circuits.com/2015/05/adjustabe-CDI-spark-advance-retard.html. please consult a motorcycle mechanic for confirming the wiring details.the capacitor is a PPC or MKT type. I think it might be the cdi. 3) As per your above statement if diode & capacitor are crucial then how your enhanced CDI worked without them? [5], The BC548 is a part of a family of NPN and PNP epitaxial silicon transistors that originated with the metal-cased BC108 family of transistors. Nevertheless, wearing out of the capacitor may be possible due to overuse. Hi I have a 2005 suzuki gsxr 400 slingshot gk76 and can't find a cdi in south Africa and need to build my own if you can help whit that please. Thank you, you have been a great help. Advance retard can be done by special circuits with the help of the triggeres obtained from the pickup coil, Hi Swagatam, oops I didnt spot the ground line. Hi siri want high voltage from this circuitlike 300v to 400v.Kindly tell me how tjis possible, Hi Mansoor, the CDI coil in the above circuit is capable of producing 20,000 V and is intended to be used in automobiles. WebThis transistor is designed for audio amplification and wide variety of general purpose uses in electronic circuits, like switching applications.Transistor Equivalent List Transistor Equivalent List TIP120 TIP121 TIP122 Datasheet NPN ON Semiconductor. I used 2N3055 , because I use 3 (12V 40A) heavy duty relays in parallel for the three phase connection. S8050 is an NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at the ground and will be closed (Forward biased) when a signal is provided to the base pin. Hello, I had opened my household generator as it is not starting. The think the CDI coil or any such trafo responds best when bursts of high voltage are dumped in their primary winding instead of a continuous frequency. The back emf generated across the winding of the transformer is effectively dumped over the speaker generating the required amplifications. So what I want is to cut out the electronic module (which includes the cdi) and just use the 2 coils (magneto in top right of the diagram) and built a cdi to power the ignition coil and get spark. WebOverview. from idle.Whith the oem CDI system, it works ok, so the AC generator and pulse signal, I think its ok.To test it, I mounted the circuit on a protoboard to experimental circuits, It could be this the reason? The BC548 is the modern plastic-packaged BC108;[6] the BC548 article at the Radiomuseum website[7] describes the BC548 as a successor to the BC238 and differing from the BC108 in only the shape of the package.
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