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Continuity tester circuit with buzzer

A simple continuity tester can be designed using electronic diagram below. The continuity tester can be used to check electrical wiring or printed wiring check. The electronic circuit consists of a piezoelectric buzzer and an astabil multivibrator.
At short circuiting of probes piezo buzzer will produce an acoustic signal.

Circuit Diagram: 
Continuity tester circuit diagram with buzzer

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