I would suggest using a GM HEI ignition module (NAPA PN TP45) to switch the coil. "B" terminal to +12V along with (+) coil terminal, "C" terminal to coil (-), heat sink to ground. You can put in any digital signal to the "G" terminal. The "W" terminal (variable dwell) can be connected to ground or to +12V depending on the input.
Had a 93 Ford Probe which I converted to external coil using signal from ECM computer to "G" and "W" grounded. On my 1951 Ford 8N tractor I use a 2n2222 transistor with a 4.7k resistor to invert signal from the points. Collector to "G", base to points and resistor, other end of resistor to +12, emitter to ground, and "W" is connected to +12.
On 2018-09-18 12:46, jimlux wrote:
I'm getting ready to start experimenting with triggered spark gaps for a TC - all the timing benefits of a rotary gap, but without spinning blades of death. What I'd love to find, and I'm hoping the TCML hive-mind can help, is an off the shelf "electronic ignition" module - not capacitive discharge, but something that basically is the "points replacement" that I can drive with an optical link (for HV isolation). The idea is to use a 12V battery, an electronic ignition, and a conventional ignition coil as a robust trigger pulse generator for the spark gap. Something fancy like the MSD, which generates multiple sparks, isn't what I want.. I want just the one pulse into the coil. Back in the day, there were "points replacement" modules - maybe something I can order as part of a HEI? (after all there's the famous GMHEICSLR contest, which used the *coil* of a HEI as the basis for a tesla coil of sorts) Cheap is good. The ignition coils are $12 - I'm not wild about spending $100 on what is basically a HV transistor and some biasing resistors and capacitors. (No, I don't want to build one from scratch.. been there, done that) _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla
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