- Joined Feb 4, 2015
Today at a thrift store I picked up an old Sears Tach/Dwell/Voltmeter with other misc. things. One of them was this circuit board and I don't know what it does apart from the fact that it seems to partly consist of some sort of joule thief circuit. I plugged in a 'dead' 9v battery to it and the green and red LEDs flash on and off in approx. 1 second intervals and have been doing so consistently for over an hour now. Any help or explanation would be most appreciated! By the way, I'm new to this community so hello everyone!
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