We found this good power amplifier with the LM12 integrated circuit in the March 1989 issue of Radio Electronics magazine. The output power is around 100 W.
This circuit was found in the Radio Electronics magazine of May 1990. The transistor is...
The circuit is from an 80's publication, but the components are current, only special type diodes...
This small crystal microphone transmitter was indicated in an 80s spy book. The range depends on...