Found in an American documentation from 1968, this circuit uses transistors from the time. The circuit can be adapted to use equivalent modern components.
This guitar pedal was found in a 2004 documentation. The signal is transmitted to an FM receiver...
This shield circuit for lamps and other charges was found in a Popular Electronics from the 90's....
We obtained this circuit from the 1977 National Semiconductor FET Databook. The frequency depends only...