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Audible Continuity Tester

Audible Continuity Tester

9814-+A761-+B3111013-+D12542-+CPROBESR2100ΩR4330ΩR510MR3100KR14.7KR61MR8100KR9330Ω0.5WPZ1PIEZO-BUZZERS1ON/OFFSWITCH9VBATT.R71MIC1(A-D) = LM339Audible Continuity Tester
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publish time: 2020-10-26
Circuit Everyday

This is a very simple, low-cost audio continuity tester that USES only a four-way comparator IC LM339, some resistors, and a piezoelectric buzzer.The circuit containing the comparator is powered by a 9V single battery.Only one of the four-way comparators is truly functional, while the remaining three parallel comparators are used to directly drive medium-power piezoelectric buzzers.

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