Instructables user [Rudolf] wrote in to share a handy little tool he created with ham radio operators in mind. Now and again, he found himself connecting to an unknown power supply, and rather than ...

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 ...

Fig 1. The voltage measurement circuit includes the ability to test secondary voltages of either polarity for deviations of 1%, 3%, 5%, and 10%. Fig 2. The schematic of the secondary-voltage tester ...

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 ...