UPDATE-

Hooked up a simple transistor with an led and resistor on a breadboard-
used the transistor to trigger 5v trigger supply to the coil using OEM cas
to open transistor. Worked, starting at 100 RPM to max of drill (1500) with
similar spark all the way through the range. Before at low RPMs, the spark
was noticeably weaker. At less than 100 RPMs the spark was intermittent.

This should result in a very simple arrangement to trigger the coils. I
will have to calculate the time to open the transistor, and incorporate
that info into a timing advance.

I also tried it with a lower trigger voltage down to 4 volts, with
noticeably less spark below 4 volts, however running it up to 7 and above
made no apparent difference. The 5 volt specified trigger voltage seems to
be correct.

My Atmel board has 12v  in and 5 volt out, with 14 I/O ports. Now for the
breadboard work and programming.

Kevin Alderman


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