CDI systems info wanted

[Stephen Burgess]

Interesting project....

CDI information is hard to find, and those that have it are usually not in the
spirit of sharing. (maybee they came across it the hard way too, and want some
$$$ for all thier efforts)

With my limited electronic knowledge I attempted to peek inside one of those
mysterious black boxes.....Friggin thing is so complicated it probably could
control a lot more than just a couple of coils charging....

What machine are you working on??? maybee your chip swap would work for my
purposes?

Arnaud Westenberg wrote:

> Hi all,
>
> First I'd like to thank Rich M for suggesting the Motorola MGP20N40CL as
> a replacement for my broken oem transistor in my motorcycle ignition.
> It's running great again!
>
> I'm considering building a CDI ignition system for my bike and therefore
> I'd like to ask a few questions. The system will be controlled by a
> processor and have a coil per cylinder. Since I'm still in the EE
> learning phase, I'm looking for information about how to build the high
> voltage circuit used to charge the capacitor.
>
> Instead of charging a capacitor, I'm toying with the idea of having a
> high voltage alternating current power supply. Obvious benefit would be
> that spark duration could be as long as needed and could simply be
> controlled by the processor. However I guess that components would be
> quite large due to the power requirements. Are there any standard
> components/circuitry to realize such a power supply from 12V?
>
> Thanks,
>
> Greetings Arnaud
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