rhys_sage at yahoo.com
Sun Oct 11 01:23:23 MDT 2009
I've considered a whole load of alternatives for driving the ignition coil. I decided in the end to play safe and optically isolate the coil from the 555 pulse generator. To that end I'll employ an IR emitter-detector pair.
I discovered a capacitor plus a resistor across the coil should, according to one website, foil any surges from the coil while a diode in series should foil any kickback.
I have a pretty mundane coil at the moment. It's a cheapie coil that I bought just to try things with. I expect it won't be powerful enough to use for anything other than experimentation - which is fine right now.
400 hertz is quite slow. Using a simple electric motor running at 6000 rpm and a spinning disk with 4 segments of alternate block and clear combined with an interrupter would give me about 200 pulses a second. Doubling the segments to 8 would give 400 hertz. That's achievable with a simple piece of cardboard!
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