DIODE_CHECKER

Published:2009/7/11 2:46:00 Author:May | From:SeekIC

Requires only one resistor, two LEDs, and any small power transformer providing 3 to 25 VAC. If diode under test is open, neither LED lights, lf diode is shorted, LED1 lights on one half-cycle and LED2 on other half-cycle, so both appear lit continuously. If diode is good, LED1 will light if anode of diode is toward transformer, and LED2 will light for other polarity of diode. Choose resistor to limit current through LEDs to about 10 mA.-M. D. Kitchens, Ultra Simple Diode Checker, 73 Magazine, Oct. 1977, p 44-46.



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