This circuit detects changes in the active cycle of the input signal. The circuit was obtained in a 1966 EEE. Transistors are general purpose types of the time.
The circuit presented is a simple MW tuner that can be plugged into the input of any audio...
This circuit was found in a 90's espionage publication and serves for analog lines. The circuit is...
This simple logic probe circuit was found in the August 1980 issue of Radio Electronics magazine. The...