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LED Tools

2014-12-10 20:14  
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Here are two simple tools for the Hobbyists to check their Prototype boards. These use LEDs as visual indicators for the quick check reducing the job of multimeter testing

Continuity Tester
This can be used to check the continuity of PCB tracks, wires, transformer windings, fuse, diodes, resistors etc. It uses a Red LED to give the positive indication. If the continuity exists, current flows through the probes and LED lights.

Continuity Tester Circuit

Polarity Tester

This simple LED tool indicates the polarity of connections. It uses a bicolour LED to give two indications. If the polarity is correct, Green LED lights, and if polarity is reversed, Red LED lights.

Polarity Indicator Circuit

What is LED?
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