Sound controlled toy low light circuit
Source: InternetPublisher:smallembedded Keywords: Voice control LED piezoelectric ceramics Updated: 2020/07/31
Working principle of the circuit: Connect to 220 V power supply, provide DC power supply to the circuit through transformer step-down and bridge rectification and
filtering. IC1 is connected as a monostable circuit . At this time, pin 3 outputs
low level and LED 1 lights up to indicate the power supply. Connected. When clapping or other sounds are received by the
HTD piezoelectric ceramic piece, the audio voltage induced by it is amplified and inverted by VT1, so that
the potential of pin 2 of IC1 changes with the external sound.
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