CDI systems info wanted

[chetwagner at qwest.net]

I have a couple of books with schematics of some older CDI systems. 
I could hook my scanner back up and scan them so they can be put on incoming.  
Let me know so I know if I have to fight with the internal scanner 
card.  You could make a high voltage/frequency supply using a 
frequency circuit and an ignition coil.  I have made these before for 
my high voltage projects, so I know that these can produce some 
substantial sparks with the proper parts.  


On 28 Feb 2001, at 18:25, Stephen Burgess wrote:

> 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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