Using an operational amplifier, this circuit from a 90s Popular Electronics, is characterized by its high sensitivity. R5 can be added to control the gain.
This RF and audio follower applies its signals to a small amplifier. The FET can be any...
This circuit was found in an American documentation from 1968. The circuit uses transistors from that...
This integrated contains a Class B circuit originally developed to provide 6 W in a car radio...