Make sure when connecting the power, duty cycle is set to low, or zero to avoid surges. You will need to connect ignition coils in parrallel for more current. For example; you have a driver like on this page driving an ignition coil at a set frequency. All the transistors are fine. The OCBI is not complex.

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If you want to control the output current, you can just control the input current using Pulse Width Modulation. Sign up using Email and Password. My ignition coil driver uses a 7.

A 1n would help, but I would reccomend using a different transistor. The transformer will prrobably survive this sort of treatment if it is just intermittent, but if switching transistor is used for controling power to the coil, it will overheat and mostet in a relativley short time. Most such designs use a bridge rectifier and a smoothing capacitor.

Is this what you were talking about? The hot one is probably partly damaged and not switching on fully. Do you have any ideas of why not? The output current is usually only several mA peak while voltage may reach over 40kV, causing insulation problems with the ignition coil.

NE ignition coil driver | Marko’s science site.

Does it require its own 9v battery for power? See power pulse controller. Sorry for the plagiarism of your circuit diagram, but 5555 am a visual person and it helps me to put it all together in one diagram like this to make sure I have everything right.


The voltage is applied relative to the emitter or source pin.

This circuit is really not worth building. A snubber like RC1 in one of the top diagrams may help. This will give you quite large spikes after each ciil pulse.

NE555 ignition coil driver

Should I remove this resistors or replace modfet If you need more power than the one shown, simply choose a different transistor. We know we need to have both HV and 88 volts DC on either side of the electrodes to get the desired effects.

You have a couple of things wrong. This is my finished circuit diagram for the project I am planning to build. It will stop conducting when the voltage goes low again. The spark will also discharge a lot of EMI, so you might want to shield it or at least keep it a reasonable distance away.

igniiton On the whole, scavenging through old cars can be quite fun for any Parts Geek, and makes for some interesting photo opportunites. You seem to be missing the point. I then further adjusted the frequency while it was running to get the cleanest sine wave I could. As well as using car ignition coils, why not use a car ignition driver module too?


mosfet – Controlling the Spark plug using IC – Electrical Engineering Stack Exchange

Sorry spudders, it’s a lot of theory beyond the basics of spudding. I would appreciate it if you could look it over and tell me if I have made any mistakes. The RC will only help if it is over voltage which kills your diodes. And I am wondering if an ignition coil high voltage power supply would be able to deliver enough high voltage and current to excite about 3 ounces of CO2 gas to a pressure of psi.

And also please provide me a v 3amps variable simple low cost dc power supply unit circuit diagram for my experiments. When it is switched off again it takes some time for the current to stop flowing, but when the transistor goes off it forces the current to stop very quickly which causes a high voltage spike. Do you think this could work with an old car ignition coil to generate sound?

Am I to understand, then, that it is not required that either end be actually needed for the opposite end to fire? You will certainly need to protect your circuit.