Gift lamp music box circuit
Source: InternetPublisher:偷熊计划 Updated: 2021/12/26
Circuit working principle: AC 220 V power supply obtains a working voltage of about 4V after being stepped down, rectified and filtered by resistors and capacitors . IC 2 is a soft-package music integrated
circuit that stores many pieces of music. After being stepped down by the wind, an operating voltage of about 2.6 V is obtained from the circuit . The music signal
is output from pin 8 of Ic2, and is amplified by PNP transistor VT2 to drive the speaker to play sound. At the same
time, the LED flashes with the music signal , and controls the one-way thyristor VS to change with the conduction angle
to make the lamp H flash. The 5-pin potential of IC 2 controls the speaker volume.
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