Found in 90s Popular Electronics, this circuit fires a load through a MOSFET from an audio signal applied to the input. Power supply is done according to the load.
This circuit, found in ancient US documentation, allows you to switch the antenna from the...
This circuit came out in an American magazine that no longer exists. It's the Electronic...
This circuit can use any operational of the MC34071 family. It was suggested by Motorola's Linear...