Acousto-optic controlled self-turn-off switch

The utility model discloses an acoustic-optic controlled self-turn-off switch, which comprises an outer housing, a circuit board, a bridge type rectifying power supply and an NE555 integrated module, wherein, the circuit board is arranged in the outer housing, four terminals are arranged on the outer housing, and the circuit board is also provided with a resistor, a capacitor, a triode, a controlled silicon, a piezoelectric ceramic piece, a photoresistor, an NOT gate, etc. The utility model has the advantage that the turn off delay time of a switch can be automatically adjusted according to sound signals. Under the condition of darkness, so long as sound signals do not disappear, the switch can not delay to turn off. Furthermore, the utility model has the advantages of simple structure and reliable operation.