This is a simple circuit named Polarity cum Continuity Tester. With the help of this circuit, we can also identify that whether the components we are using in our circuit are good or bad before ...

The CT20 is a two-part system consisting of a master continuity tester/transmitter and a two lead, bi-color (red/green) LED remote probe. The continuity tester/transmitter is used for local continuity ...

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 This can be used to check ...