This circuit can be used as an answering password system in a store, office, or other location. The circuit is from Intersil using components of the time. The circuit is from the 80's.
This circuit generates a constant current given by R1. The load is on the high side of the feed...
This selectivity multiplier circuit for 455 kHz IF receivers was found in American documentation from the...
PTT or Push to Talk is the control that switches the speak-hear function on a transceiver. This circuit...