This circuit was found in a 1945 publication. The circuit was stated to be part of a walk talkie. Note that, as it is a portable assembly, it was powered by batteries. The jack was for microphone insertion.
When the AC Power line fails, the transistors in this circuit are biased to conduce the current to...
This circuit hás a Power output of more than 1 W. It is used in small experimental or low power...
This circuit was found in Philips documentation from 1967. The components are of the time, being...