This is a battery powered 3W power amplifier using germanium transistors. The circuit is from an English documentation from 1967. The transistors are from the time.
This RF circuit measures transmission power from 0.25 W to 10 W. The maximum frequency depends on...
Found in a 1970 American publication, this circuit uses transistors of the time. These transistors...
This microphone circuit was found in a collection of American 80's layouts, using operational...