This circuit is from the National Semiconductor's Linear Applications Handbook of 1994. The circuit can be implemented with equivalent operational. The detected voltage is given by the diode.
This source, from a 1982 documentation, uses a triac to control the power and voltage applied to...
The amplifier presented is ideal for use in small monophonic sound systems, radios or televisions powered...
This wired control circuit serves both volume and balance between channels. We found it in Radio...