LED Power Meter

LED power Meter circuit is a simple RF detector using diodes to charge a capacitor. The voltage developed across the capacitor is indicate...

Simple Meter Impedance speaker Circuit Diagram

A simple impedance meter can be useful to measure the actual impedance of a speaker or headset, ideal for anyone working with sound, makin...

Simple Audio Power Meter Circuit

This simple circuit indicates the amount of power that goes to a loudspeaker. The dual-color LED shows green at an applied power level of ab...