This squelch circuit is placed at the input of the single receiver audio amplifier stage. Its purpose is to silence background noise. The circuit is from an 80's documentation.
We found this circuit in a 1982 documentation. The circuit drives a relay when the sensors are...
The DC output of this circuit corresponds to the RMS value of the input voltage. The circuit is...
This well-known configuration was found in a 1982 publication. Other operational amplifiers can be...