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Here in Australia you can buy microwave oven fuses from WES components in Sydney. They are commonly 3AG or M205 ceramic with a flame retardent powder inside.
This is a circuit of a typical generator that you have. The output voltage is controled by the capacitor. Dfiferent values give different voltages, as also does different engine RPM. If the capacitor is open circuit you get no output voltage.
It varies from zero & small pulses. was able to capture a larger pulse. Beare in mind this is not in test mode so its not much more than what leaks out of a microwave door. If you push the test button it doesnt register.
Here in Australia there was car radios in the early 60s that had 12V valves in the front end & Germanium transistors in the audio stage. They seemed to work well.
I used a soldering iron to carefuly remove the plastic on the Atom module. Once the components were exposed the module worked fine. Since the original module works fine on the 4 engines i have them on ive left it at that.
Havent bothered to try any equivalent transistors or mosfet, as i have about 20 2SD1071 transistors. So at the age of 73 yrs i dont think i will need any more.
Im not a design engineer, so cant realy help you. What i presented was a reverse engineereed Atom transistor driven ignition module. i had enough trouble by trial & error finding a suitable ignition transistor to work reliably.
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