Home › Forum › Ask A Member › How do Atom Computer Ignition modules work? › Re: How do Atom Computer Ignition modules work?
Today I received a packet from Ken, with two BU931 parts – thanks, Ken!!
I built up a module with the following component substitutions: BU931 for 2SD1071, 1K3 for both 1K5 and 1uF/50V (electrolytic) for 0.47uF. This is just what I had on hand.. need to buy some 1K5 parts.
It seems to work just fine, nice bright spark – again, using the 1947/1948 TD20 magneto as the testbed. The (debe) suggested Transorb diode +is+ being used.
Unfortunately, this is that same "problem child" TD20 that I cannot make run correctly in any form. At this point, I’m chalking it up to low compression (60/65) – which seems like it should be semi-OK, but the dang motor just will not run correctly, or even at all, at lower throttle settings. Believe me, I have tried. So I don’t see any point in trying to actually start and run the engine on the prototype module.
Lacking a runnable OBM, I’m thinking hard about putting this on my lawnmower, lol.. but is it worth it??