Hi to all people interested in CDI's.
My name is Uwe and I'm from Germany. Please excuse my none perfect English. The reading of this thread was really interesting and you did already a good job, especially bigboat from NL.

Years ago I tried to build a CDI by myself, but just with medium success. The base I use is slightly different to the version your are talking here. I work with an external oscillator for the DC intermediate circuit. The rest looks very similar. Basically my system works but I have problems to raise the voltage fast enough for high speed engines. The best result I ever reached was 6 ms for 150V in a 0.47 µF capacitor after the fire signal. My target is to reach less than 3 ms as it was reached with the poor system described in an article od Floyd E. Carter. Unfortunately I couldn't find the link any more. The way how to create the DC voltage is the same as the version of bigboat.
I already read the full thread but I couldn't find any no. of ms or a scope diagram. But if the CDI will go up to 30000 RPM the time have to be less than 3 ms.
The problem I encounter is the "transformer". I tried different version but with no success. I found out using a ferrite ring is more insensitive to frequency variations of the oscillator than other versions.
Before ordering the FLPS board just to have the e-core is somebody of you able to tell me your reached values of:
- max. DC voltage
- raise time up to 150V
- used capacitor (µ47F?)

Would be nice if you could support me with some technical details.
Thanks in advance.
Uwe