This circuit is from an August 1984 Radio Electronics magazine. It monitors the state of a RAM backup battery. Resistor R1 determines the battery charge.
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...