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Thanks. That does work. So how does it work? When I short across the led does the current flow continue and does the pulsing continue?

I am using a two transistor led flasher as part of an alarm in my RV. I need to be able to start the flasher by opening a normally closed switch. I have the led flasher working perfectly but I can't figure out how to switch it. I've tried adding another 3906 to switch current to the led but this...