Instructables

Diy Polarity and Continuity Tester

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This is my homemade polarity and continuity tester (max. 14 volts)
I used : 
2x Bright Leds
1x Resistor (depends on leds and voltage)
and some wires 
Circuit was made in multisim
What you've built is a voltage checker with polarity indicator.
A continuity checker (like for checking fuses out of the circuit) has its own battery and it needs no polarity indicator.

What did you use for the body housing and probe?
tutdude98 (author)  simplyconnected2 years ago
old pen
tutdude98 (author) 2 years ago
Continuity tester is small battery