Found in an EDN from the 90s, this circuit makes use of integrated circuits of the time, some of which are uncommon today. The output is given by:
Where:
In the absence of a modulation signal, the carrier of this simple short-range transmitter is cut...
This circuit was obtained from an 80's Electronic Engineering. The circuit detects ice formation...
Other operational amplifiers series operatives, such as MC34072, MC34074, MC35071, MC35072,...