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Multicolor advertising lamp box with emitting music circuit

2016-08-03 16:42  
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Multicolor advertising lamp box with emitting music circuit (1)
Multicolor advertising lamp box with emitting music circuit (1)
The circuit is shown in the figure. It includes the clock pulse generator, counter/divider circuit, thyristor trigger Lantern circuit, music circuit and AC step-down rectifier circuit and so on. Red, green and blue lights are placed in a glass box, it will emit soft light with three colors of red, green, blue in an order and broadcast world famous music one by one to attract more customer. F1~F3 are three gates of six inverter IC CD4069, and F1, F2 and R1,R2,C1 form a self-excited harmonic oscillator with oscillation frequency is