Article

Continuity Tester

Sensitive and Unintrusive

This simple yet sensitive and unintrusive tester will help you locate broken PCB traces or find short circuits in no time!

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R1, R2 = 2 kΩ, 1%
R3 = 39 Ω, 5%
R4, R5 = 10 kΩ, 1%
R6 = 330 Ω, 5%
P1 = 500 Ω, multi-turn trimmer
C1 = 47 µF, 16 V
IC1 = LM311
LED1 = LED

BUZ1 = piezo buzzer with oscillator