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.
This circuit allows the measurement of resistance in the megohms range using an indicator LED and...
The purpose of this circuit is to enable the car or motorcycle starting system only for a certain...
With this circuit it is possible to receive signals in the 2 m (150 MHz) range on a pocket AM...