Well, I finally got a chance to rebuild this ignition.
I assembled the bottom one in the sch. Had it all build and went to test it, and I had voltage at the coil conection all the time.
I assumbed that R3 was to blame, and found that the current was OK. Tried and tried to find the problem, currents etc. I disconected the TIP42 base and pulled it up to power, and it is FRIED, and of course I don't have another.
I have: TIP29A, IRF720, IRF520
I've been looking around and had no luck finding another large PNP tranistor.
So my question is, what would it take to make one of these work like in the first drawing? values suggestions? etc.
FYI: I am building this for a friend and he wants to run his motor he just built, so he keeps asking me.
After a day of building and working with PLC panels all day at school....
I need some sleep. :?
Thanks again
Kent Kenison