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 ...

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 ...

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 ...