[HKZ Bob]

Originally Posted by Early_S_Man

Well, after a bit of a delay ...

Here's the schematic and replacement parts list for the Bosch 0.227.300.004 6-pin CDI unit, cussed & discussed at great length ... and used on SCs & Turbos thru '89!

Dear all
I have a lot of noise on the Schmitt Trigger on point Base T2. I assume it causes misfire. Can that be?

How do I evaluate The correct value for R5. selected resistor? The owner before placed 50k resistor at R5/R6

I am using a 2 V peak to peak sinus signal a a trigger. I s that appropiate.
If I increase that value to 8V pp the box works better due to a better signal to noise ratio.

How do I reduce the noise on the trigger ?

Regards Bob