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Re: [TCML] Frequencies



Paul Brodie wrote:
A standard commercial automobile engine runs at 6,000 rpm tops. The ignition coils are deigned to be driven at this frequency. This works out to 100Hz or less, 6000 divided by 60 seconds.

Only if you have a 2 cylinder engine(!).. a six will fire 3 times per revolution (300Hz) an eight more.. Got that V12 Jag and you will be firing at 600 Hz.


From much
experimentation, I have found that the coils I have worked with, primarily the Accel Super Coil, will continue to produce higher voltage up to around 1kHz and then start to drop off. If you try to overdrive the ignirion coil, you will get less output, not more. Also, wouldn't it be better if you let everyone know what it is you are trying to accomplish with this? I believe you said you want to try to charge caps to first 25kV and then to 50kV in stages and use these to drive some sort of flash. Is this correct?

This is the kind of circuit that is hard to do empirically. You can copy a known good circuit from someone else (e.g. the multitude of triac dimmer, capacitor, ignition coil circuits) and it will work ok. But if you start to modify, or try to do other things, you need to understand the theory to know where you're going.

ignition coils are not a great way to make a generic HV source. They're great if you want sparks or HV pulses (where the pulses are of a certain shape and duration). But as soon as you move away from what they do best (e.g. firing a spark plug), you'll find you're adding circuit on circuit to get where you need to go.

What, exactly, do you need, HV pulse wise?

Voltage, rep rate, load current, pulse width?
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