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Tracking an undesired reset problem in my preassembled unit, I put another diode beside the polarity reversal protection diode in the +12 line, and connected a RS "heavy duty" (don't bother showing me the cheap ones, if this is the high grade) 9V connector and alkaline battery. This way, the battery supplies the unit whenever the +12V feed goes below 9 volts. This eliminates the flaky main power in troubleshooting. FWIW
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