Such an amplifier can be used in mono-, stereo-, quadro-phony, or for audio effects, mixing audio signals, or as small public announcement systems, small audio distribution systems, low-power amplifiers for electrical instruments, noise distribution systems, audio line drivers, bridged and paralleled audio amplifiers, and so on.
Car accumulator or simple 1A to 2A wall adaptor. To keep this quadraphonic amplifier using LM386 simple and inexpensive, it does not have tone control potentiometers.