Electrical Projects Consider the circuit of another very simple continuity tester. It consists of a L5V flashlight cell or a No. 6 dry cell and a 1.6V, 16 mA LED. When the test leads are shorted, the LED will glow at full brilliance. It will glow at less brilliance when checking the continuity of a circuit that has a resistance of 300 ohms or so. The effective resistance of the LED at rated current is approximately 100 ohms.





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May 19, 2012