Please see the second diagram, you can trigger it through the alternator by connecting the ICs reset input with the alternator pulses. Can you tell me this cdi I can use for yamaharx135? Unfortunately i will be away the next 2 months but as soon as i return i will start. After 3 minutes, the 12V supply to the inverter is diconnected and also the CDI input is linked to the HV from the exciter coil. 1) You note in the schematic, “To Trigger Circuit”. the second circuit is not sparking all the time, it's synchronized with the alternator through its pin4…. I need to know how many motor drive require to run three steeper motor ?? The ignition coil would be already present in the vehicle, it will need to be integrated with the assembled circuit as given. Did you make this project? 2. Something different? If the ECU has 4 (or 6) separate (output) trigger pulses then you would need a simple 1-channel CDI + single coil + spark plug for each cylinder. Firstly I want to say thanks for making your schematics available. Still waiting for the CDI with ferrite core transformer, which you proposed on Oct. 11, 2013. Normally, the two wheelers have 6V batteries. The design which Swagtam has recommended is a 3-phase Fullwave rectifier. The modifications are indicated in red boxes. In a multi cylinder engine there is a distributor which distributes the spark to each cylinder based on the timing set by the rotation of the camshaft. It may work, but will fire much too early for low rpm at tickover. Hi there Swagatam, I plan to retain my existing motorbike cdi and instead insert and adjustable spark delay circuit still triggered by the alternator pulse signal. DC motor 2 enable jumper. I do believe that this is one that you designed for automobiles. yes i can make that no problem 🙂 I have seen some pictures and explanations on other forums etc so just point me in the right direction for the size and type of parts i need, i am staying in Taiwan at the moment so there is a lot of electronic stuff available here!! does the duration of the trigger signal matter? if so what should i set this to? Tools & Supplies are available at Mouser Electronics. Wrap the base with the output wire through a couple of wire turns. But anyway, yes the trafo primary V rating would depend and should match the battery voltage. I need a circuit with 5 joules output energy So I have some questionsHow much power this circuit can provide ?What is the type of transform?is it a pulse transformer?what is the number of transistor device? With our example motor these are red, green, yellow and blue. Connect your motor supply voltage here, maximum of 35V DC. This is important because SCR within the CDI demands the current across its MT1/MT2 to be zero. Also Automotive coils connect using 2 wires normally, one is constant power and the other is the switched signal in this case should one just be earthed? For that particular reason the motorcylces' flywheel are equipped with a small raised metal strip and pick-up coil is installed at a position that it sync with the TDC of piston. For design which allows both inverter and exciter coil, I shall update soon. The triggering should sync with TDC position of the piston. In that case won't the need to be 220v/6v? You will need to determine the A+, A-, B+ and B- wires. getting a 220V trafo in US could be difficult since your country utilizes 120V for the mains….there's a workaround you can try for acquiring 220V from a 120V transformer, you can use a 0-6V/120V transformer instead and the output will be almost 220V provided the circuit is powered with a 12V. No this circuit does not include the "advance" feature. Hello Swagatam, is the trigger pulse from the alternator AC? Reply thank you very much, just copy the parts as indicated in the diagram…the shopkeeper will be able to provide you the correct ones. How can I do this? Can you help with a circuit for my atv , I am not very good in electronics but I have friends who can help me but i need an specific circuit because my cdi doesn t have trigger and work using just electricity from his coil . The system I had is a CDI that is powered by the 12v AC generator and it does not have a pulse signal, I wonder if this circuit can be used to update the one it has, besides that it would have to change for that to work, in the same way that you have it but without the pulse signal and that it only feeds from the generator. The modern CDI is an electronic version of the contact breaker which uses sophisticated electronic parts for generating the required arching across the spark plug terminals. i would like to seek advice from the learned members of the group on the feasibility on this prospective mod. Hi Swagatam Is it possible with AC or DC cdi box circuit output high voltage to run DC or AC motor? Finally, a quick demonstration of our test hardware is shown in the video on this step. without multi-spark feature the whole purpose of the design would become meaningless and it would become as good as an ordinary CDI as given here: https://homemade-circuits.com/2011/12/how-to-make-capacitive-discharge.html. And the magnitude of that voltage is about 180VAC. However the second circuit needs slight modifications, I'll hopefully do it soon. Finally this is demonstrated in the video on this page – using our well-worn tank chassis with two DC motors. It has 200 steps per revolution, and can operate at at 60 RPM. I am an antique auto and motorcycle restorer, and I’m not having an issue with the mechanics, this is my first pcb and I was hoping for critique on that. yes we could just have 2 or 3 totally separate units but i would like to have everything contained in one unit if possible, and im thinking there would be some way to share some of the circuitry…. Abdul, the trigger signal is the 5V timing pulse voltage from the alternator. Yes, this is correct. some questions; on a 6cyl with 3stage CDI this will operate at total spark outputs of up to 400Hz. Hello Edgar, the input at pin4 should be actually from the trigger coil of the alternator, yes the zener diode will make sure that the signals are appropriately stabilized before it reaches the IC. By resistance do you mean a suppressor? If you don’t already have the step and speed value for your motor, find out now and you will need it for the sketch. | ______ output to tip22……………………| Timer module |……|12 v —————- | ……………….. |……| ___ to the scr, or leading scr form of a trigger signal into parallel paths, ………………. Now you will need six digital output pins on your Arduino, two of which need to be PWM (pulse-width modulation) pins. Current isn't much of an issue here because the spark plug gap is so small that even a 500mA trafo would work nicely. hi bro,what is the difference between the alternator ang magneto,rectifier? Share it with us! How can it spark all the time when pin4 of the IC is connected with the trigger signal?? Hi. I control motor through bluetooth modul. how can get out of this hole . Thanks Sandeep, the capacitor will not be affected due to the high frequency, but if the diodes are not rated to handle the high frequency then it could lead to problems….so before installing you can check whether the diodes are appropriately rated or not. Pin#8 and pin#5 connections needs to swapped, same for pin#6 and pin#7 connections, looks like the pin#5 to pin#8 were mistakenly counted in the opposite direction. I will soon correct all the diagrams and make sure all are synchronized with the alternator and the vehicle RPM appropriately. https://dl.dropboxusercontent.com/u/20969135/CDI%20output.gif. Finally, connect Arduino GND to point 5 on the module, and Arduino 5V to point 6 if sourcing 5V from the module. Haha yes I noticed it shortly after I sent that message. Please click the diagram to enlarge it, you'll find the part numbers clearly indicated beside the respective component symbols, if you still have problems please let me know. If you can do that, I will help you for the circuit. Hi, the core of the ignition coil determines how fast it can be triggered, and here the core is able to tolerate well over 100 cycles per second, which is 6k RPM, close to what is needed by you. You need to add a fast recovery diode like UF4007 to convert high frequency AC into DC and then input to CDI. Actually it should be "ignition coil", wrongly written as trigger coil. GND. Great job.I have an HHO installed on my motorbike and I need to retard the spark timing. However, sports/performance bikes or bikes with more than 200cc have DC-CDIs which generates more than 300VDC. First connect each motor to the A and B connections on the L298N module. Having both inductive and capacitive spark discharging simultaneously (using HV diodes to protect inductive circuit) would be great (like MSD Stacker or Pertronix second strike). Hence, for approximately 3 minutes the Inverter will provide HV to the CDI via relay contacts. thanks for your reply so could I use any non polar capacitor such as film capacitor, 105/400V must be non-polar…you can use any type rated at 400V or above, thanks for your reply Is it rated 400V AC or DC. Tengo dudas sobre el valor de las 2 resistencias que van al Triac, me podria decir el valor de la de arriba y de la de abajo. I recommend using a "chopper" style driver like the StepStick, they use current limiting and can work with these types of motors. Joe. My research revealed a circuit titled, “Multi-spark CDI Circuit”. Thanks. The one on the right is with the AC supply from the boost circuit. DC motor 1 enable jumper. If there is an Exciter coil in the stator then it has AC-CDI if not then DC-CDI. hey there,i need to connect four 12v dc motor to motor driver L298N .how can i connect it , or i have two two motor driver for that .pl..answer with proper steps how to connect.thanks in advance. Hi Swag. I am having trouble reading and figuring out some parts. And as Swagatam has mentioned, that 180-250V are more than enough. No change in their performance on the roads. Only a few models have DC-CDIs (with built-in HV inverters) but, their magnitude is also around 200-250VDC. I have the photo of the cdi pcb board but i’m not sure about the component they use on the board. The advantage of this method is that in future, if for any reason your CDI stops working; you simply need to replace the CDI with a new one. Thanks Solomon, this circuit is designed to create sparks only, so I am not sure how the sparks can be used to initiate the generator ignition, because ignition system normally also incorporates a fuel injection system for injecting fuel into the combustion engine for the required combustion. However the motors will not turn until a HIGH is set to the enable pin (7 for motor one, 12 for motor two). This inconsistency ultimately affects the functioning of the CDI and the whole system starts getting hampered,  sometimes even causing the engine to halt. Place the jumpers included with the L298N module over the pairs at module points 7 and 12. I can not tell where the 12v trigger comes into the circuit on the updated circuit. i need to control stepper motor without libraries .. Good tutorial, but could you explain with a simple schema, how to make the correct connection to use a bipolar stepper with this Dual controller? Secondly, those delay/advance are required in Racing/Performance bikes not in commuter bikes. it has a single cdi wire feeding the twin coils . Thanks so much. As far as using 12V for the spark is concerned, I am afraid that won't be possible and you would require an ignition coil for that which would in turn require an intermediate step-up transformer for raising the 12V from the battery or the magneto to approximately 100V for the ignition coil primary and for initiating the sparks across its high tension cable end. Moreover, you would also need some modifications in wiring and ignition switch. We use cookies to ensure that we give you the best experience on our website. I am not sure about it, you may have to consult this with a qualified auto mechanic. I can use two ignition coils in parallel or do I need to isolate them some way? Would it be possible for ease of assembly to get a drawing of the traces as you would do them for the final iteration of the ignition module? Swagatam Majumdar mir bitte etwas TR2, bin ich sehr dankbar, Hi swagatam,how about old car with breaker point, can use this circuits ?Thank you. Abdul, If we connect the SCR gate also to the pick-up pulse trigger, it wouldn't allow the SCr to sustain it's firing process the moment the pulse moves away…the SCR needs to have a continuous firing trigger so that once the capacitor is charged it's able to sustain the discharging of the cap until fully discharged. you can try retarding the sparks by employing the spark control facility provided in the enhanced version of the CDI circuit. In that case, I would request you to elaborate further, if possible with the aid of block diagram. PWM pins are denoted by the tilde (“~”) next to the pin number, for example in the image of the Arduino Uno's digital pins. it would produce a capacitive spark each time the original vehicle inductive fires??? – 5ms?.. If so, need to rectify it before pin#4? Just eliminate the lower bridge rectifier and you will get a 4-pin RR-unit. Now let’s get the wiring done. Hoping to get this project done this week and get the seadoo back in the water. Let me know if you have any further problems! 1. when i remove jumper, "L298 module" shut down, if i put jumper back i get only around 5v to DC motor. This perhaps helps to produce a smoother transition to the engine speeds and combustion. It could not be rectified. By the way, might you have a Parts List you could share? “Arduino Workshop”. Last Updated on February 11, 2021 by Swagatam 248 Comments. Hi swagatam. yes a 5V oscillating trigger would be sufficient for producing the proposed results. Now in due course of time as the exitor coil( produces around 100-150v @ 3000rpm) winding becomes weak there fore is unable to produce enough voltage to charge the capacitor as a result lots of kicking is needed to start the bike..To get rid of this issue i have decided to put a module which simply replaces the exitor coil.The module converts 12v dc(from battery) to 90v square wave ac @ 30khz frequency,this ac output is feeded to cdi unit,what i guess is that this mod would fully charge capacitor of cdi instantly & when kick is applied the timing pulse(from the pulsar coil) would triger the discharge the capacitor through scr tothe primary winding of ignition coil & would produce better sparks & hence better ignition. I have a Honda 750 twin spark twin cylinder motorbike so I assume I’ll need two units. Thanks Joe, if the timing of the triggers are identical then a single coil output can be bifurcated into two, however if the timing of the two triggers are required to be different then separate coils would become mandatory. How would you do that? The key to successful stepper motor control is identifying the wires – that is which one is which. Thanks again. Can we shrink the size of the transformer, like using a toroidal core? Up to 70°C+-. The L298N H-bridge module can be used with motors that have a voltage of between 5 and 35V DC. not exactly sure, it could be around 2 amps at the input side. 2) retarding or advancing the timing may not be possible because the circuit is dependent on the actual triggers from the alternator,. As per your suggestion, adding another 10uF capacitor drops the voltage to 160V. The 555 signal allow the capacitor to get discharged through multiple sparks by breaking the charge into many pieces instead of dumping the entire voltage instantly as we have in ordinary CDIs. Don’t forget to connect Arduino GND to pin 5 on the module as well to complete the circuit. Earlier, the bikes had 6v batteries and I assumed they are still having the same set-up. yes no problem, any DC 12V power supply can be used, current can be 1 amp or higher…. The following post describes a simple yet enhanced 12V capacitive discharge ignition system which derives its operating voltage from the battery instead of the alternator for generating the igniting sparks. If you’re using two motors for a robot (etc) ensure that the polarity of the motors is the same on both inputs. Of the circuit designs you have posted, or still not posted to the Web, what do you recommend for upgrading my Classic, 4 Cylinder, 4 Cycle Beetle? this is exactly the way we often do it now inductively using simple transistor based igniters but the spark strength is often not strong enough for turbo and high performance applications. Note that the 5V regulated power on pin 5 above is an output when the 5V_EN jumper is in place. Of which, I am scrubbing the drawings and schematics, (I was not able to locate a Parts List). Thank you thank you very much God bless you, my son will be able to enjoy his toy. Thank you very much. Thanks for the reply tho, will look up to your other interesting projects. Joe. Hi i have limited understanding of detailed circuit operations but that has never stopped me building many interesting projects in the past! I'll look into it and reply you as soon as I figure out a suggestion. 1 amp,………….. trigger should be on 0-12V side, Hi Swagatam.Congratulations for your super interesting demonstration.I work on a small project with a small HHO generator 4 stroke 190 cc 6.5 hp.We must completely change the CDI.I will use your system, I use 2 hall effect HO44E.1 hall effect that cancels the second spark via NE555Another hall effect trigger in use.I must use the circuit with the pulse triger, rightwhat type of diode used, Thank you in advanceHappy new year for 2015Michel. Reply a positive 5 to 12V trigger will be required for the second and the third circuits, the length of the spark could matter, I am not very sure about its significance…but it's said that multiple sparks for some fraction of a second gives better results than one abrupt strong spark…. Please note that the spark timing has nothing to do with the engine displacement (i.e. Gracias de antemano, hi dear sir god bless you ,i have designed some double coil for car and i am in the process of producing unfortunately 30 percent of productions is returned due to problems including leaks and arc from the inside , And I’m designing a test circuit for the coils before transferring, I want to count the number of pulses that reach the candle through the output wire and wireless, that is, by wrapping some wire around the wire plug ((((Please enable an output circuit only to the extent that it activates and deactivates the transistor.)))) Two timings pulses. yes this design will be powerful enough to work with any ignition coil. Thanks again, friend! !This is brilliant and it will get built! Also, can I split the output to two coils or should I put in some isolation circuitry to feed each spark coil? a 125cc suzuki model 2008) ? Here’s why. Because of this I was wondering if this unit Works as a piggyback of an inductive OEM system (negative is also triggering). I suggest you to use any of those two and you will be fine. Due to this the generated sparks are very consistent without interruptions providing the vehicle a constant supply of the required ignition sparks irrespective of the vehicle situation. note that lighting coils put out more amps and lower voltage .. then this bike fires once at 180 degree 2 times faster then this cdi has been design to do . Also I want to fire my ignition with a hall effect sensor mounted on a movable plate using my old mag coil mounting screw holes in association with a new flywheel with a magnet mounted. the above circuit must be built just as shown, I have tested and verified the design practically. ?btw is there a replacement of tip 122? I also want to double check that I have Q1 and R1 correct. You can learn more about them here: https://www.homemade-circuits.com/potentiometers-pots-explained/, Excellent thank you I just wanted to be sure.