Voice controlled lamp time-delay switching circuit

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of control circuits, in particular to a voice-activated lamp delay switch circuit. Background technique [0002] Voice-activated lights are used to control the opening of the lights by sound. After the sound disappears, the lights will go out after a delay. They are widely used in corridors. At present, the sound-activated lights on the market have poor sensitivity and require a loud sound to trigger, and the circuit is complicated, the production cost is high, and the debugging is inconvenient. Contents of the invention [0003] The purpose of the present invention is to overcome the problems of poor sensitivity, need for a loud sound to trigger, complex circuit, high production cost and inconvenient debugging of the sound-activated lamps on the market. The voice-activated lamp delay switch circuit of the present invention collects sound by pressing a ceramic sheet, has good sensitivity, can be triggered...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of voice-activated lamps on the market, such as poor sensitivity, requiring a loud sound to trigger, complex circuits, high production costs, and inconvenient debugging.

Images