This simple circuit for headphones or small speakers was found in documentation from the 90s. The circuit works with voltages from 5 to 9 V and has good gain.
More and more supercapacitors are being used as supplementary sources of energy in several...
Varactor diodes are our varicaps of today. This circuit for switching signals in an RF circuit was found...
In this circuit the output current is limited by R3. For a 300 mA current, R3 must have 12 Ω. For...