Photoelectric control electronic birthday cake circuit
Source: InternetPublisher:Lemontree Keywords: Diodes power supplies and other power circuits Updated: 2020/10/12
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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