This circuit was found in documentation from the 1980s. It is powered by the audio signal that must be cut. Transformers are the critical components and transistors are 2N2222.
The purpose of this circuit is used in communications and to respond to signals that are in the 2...
This circuit was suggested by Motorola in a 1980s publication. It is based on a PUT that is not a...
Found in American 90’s documentation, this circuit generates 300 Hz depending on the capacitors...