555 based additional electronic instruments in the audio circuit
555 based and timing conversion circuit for TV monitors
555 based automatic screenings protection and shutdown circuitry
555 based audio broadcast remote control switch circuit
555 based auto power switch circuit for audio and video equipment
555 based automatic playback circuit for tape recorder
555 based automatic recording device circuit
555 based automatic shutdown protection circuit
555 based automatic volume adjuster circuit
555 based Clear audio equipment on and off with pop sound