Photoelectric control electronic birthday cake circuit
Source: InternetPublisher:笑流年 Keywords: Power supply other power circuits Updated: 2021/05/09
Photoelectric control electronic birthday cake circuit
Shown is the circuit of a typical photoelectrically controlled electronic birthday cake. In the figure, VD1 is a photosensitive diode, and IC1 is a control circuit, which is a music chip. When the switch S is turned on and the candle is lit to illuminate VD1, the voltage at pin ② of IC1 drops, and pin @ outputs the control voltage. The music chip works and outputs a music signal to drive the buzzer. The instrument makes a sound.
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