The invention discloses a voice controlled lamp time-
delay switching circuit, which is characterized in that a
rectifier bridge circuit VD1 and a
thyristor VT1 form a switching main circuit, a time
delay circuit is formed by an audio control
chip U1 and a piezoelectric
ceramic piece B1, the piezoelectric
ceramic piece B1 picks up an acoustic
signal when a user claps the hands or stamps the feet, then the acoustic
signal is amplified by a
transistor T3, a forward pulse is given out, the forward pulse is coupled to a base
electrode of a
transistor T2 by a
capacitor to enable the
transistor T2 tobe instantly conducted, the audio control
chip U1 is triggered to operate by the high level of a trigger terminal, an output end outputs a music
signal stored in the audio control
chip U1, the musicsignal is amplified by a transistor T1 and then injected into a gate pole of the
thyristor VT1 to enable the
thyristor VT1 to be triggered into operation, the switching main circuit is conducted, a lighting lamp L1 is turned on, and the lighting lamp L1 is turned off when the music signal stored in the audio control chip is completely played. The voice controlled lamp time-
delay switching circuitis simple, low in cost, free of programmed control and convenient to implement, and has good application prospects.