The circuit is used to automatically control the volume levels of cassette recorders, audio tape recorders, amplifiers or radio devices. The AVC circuit works this way: the FET (t1) is used as a ...

The puck has both the volume control and the mute circuit. the signal goes out to the puck and back again - the mute provides a DC signal to turn the amp on and off. IIRC it's 5V for on, 5V off ...

Boston Acoustics showcased a group of versatile, easy-to-use Volume Controls and Speaker Selectors at the International Consumer Electronics Show. The RVC90i, which uses a rotary knob to adjust volume ...