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.
This circuit mutes a system when a phone call is received. The circuit is from a Radio Electronics from...
This circuit is from a 1967 publication. The configuration holds true for modern transistors having...
L1 is the secunday wound of a common power transformer with voltages between 6 and 12 V and...