It works! This is the modular HV power supply for the modular CD
ignition. Everything from one power supply and one CD module per
spark plug down to one power supply per engine and one waste spark
coil per rotor.

Thanks to all the smart people on here that have helped. Thanks to my
wife Robin for putting up with my 16 hour a day work habits :)

It has been a mount Everest learning curve.

The IGBT is running at about 80 F and the input voltage for the power
supply is 8 volts for the scope picture shown.

With no load input current is less than a tenth of an amp.

The scope is set to 50 volts per division so what you are seeing is
350 Volts peak. That varies with pulse width and output current will
vary with frequency.

The time base is 10 usec per division.

The osc is running at 40Khz.

The IGBT is the same one I am using in the CD ignition modules. The
coil is the same one Lin Tech uses.

The idea here is to use a sledge hammer IGBT.

Parts cost less the PC board is less than $20. No tricky, expensive
and troublesome LSI  chips :) CMOS 555's and 4050's are less than $1

All this is initial. Pulse width is manually adjustable as is the
frequency.

I am very relieved. It has been looking bad and too hard to do for
years.

Paul Lamar

Excellent effort Paul!  It appears that you have finally achieved your
goal of a practical CD system.  I'm sure there are many tests to run and I
assume the results will confirm your initial findings. This is exciting news!

Gary Knutson


Yes I agree! Very exciting. It has been running on the bench for five hours so
far. I will eventually put it in the oven and cook it at 200 F :)

I always thought MSD was charging too much :)


Paul Lamar


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