Continuity Tester
author: johnsondavies
2 layer board of 1.75 x 0.40 inches (44.4 x 10.2 mm)
Uploaded:
November 13, 2017
Shared:
November 30, 2018
Total Price:
$3.50
This article describes a simple continuity tester, based on an ATtiny85 and a piezo buzzer, designed for checking circuit wiring, or tracing out the tracks on a PCB.
It has a low threshold resistance of 50Ω to avoid false positives, and passes less than 0.1mA through the circuit under test, to avoid affecting sensitive components. It’s powered from a small button cell, and automatically switches itself off when not in use, avoiding the need for an on/off switch.
This article describes a simple continuity tester, based on an ATtiny85 and a piezo buzzer, designed for checking circuit wiring, or tracing out the tracks on a PCB.
It has a low threshold resistance of 50Ω to avoid false positives, and passes less than 0.1mA through the circuit under test, to avoid affecting sensitive components. It’s powered from a small button cell, and automatically switches itself off when not in use, avoiding the need for an on/off switch.
