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Touch music color lamp circuit(BH-SK-I)

2016-08-05 11:35  
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Touch music color lamp circuit(BH-SK-I)
The circuit is as shown. It is composed of touch switch, SCR trigger circuit, music phonation circuit and AC depressurization rectifier circuit. BH-SK—I(IC1) is a sound control IC, it uses internal bistable state trigger as switch, to control the color lamp on or off. When the sheetmetal M is touched, the body inductive clutter singals are added to input terminal I foot of IC1 amplifier, after the singals are enlarged and shaped, selected frequency, triggered bistable state trigger by IC1, its 12 foot will output about 5V high level. This high level jumping singal outputs two roads: one is added to VT1, then VT1, VS turn on, to light up the color lamp series H1~Hn; the other is added to the trigger terminal TG of IC2 by R4, to make the trigger phonate.