This 50 Hz rejector or notch filter was found in a 1975 documentation. Other frequencies can be obtained by changing components. The filter uses a Wien network and must use a symmetrical power supply.
We found this circuit in the 1990 Motorola Linear Databook. The circuit must use symmetric source and has...
This circuit acts on the dynamic range of an audio signal, which can be useful for recording,...
Found in English documentation, this touch sensitive switch must be powered by an isolation...