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Multi-function electric fan control circuit with crickets so

2015-03-03 04:30  
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Multi-function electric fan control circuit with crickets sound using PT2124
As shown in the figure, when you press speed key to start the fan, in each case, it is operates with stroke. M-end (15 feet) outputs drive signal which is added to VT1 (PNP tube)'s b pole by R6 to make VT1 get conduction, e pole's low level signal can triggers IC2. IC2 uses animal voice simulation integrated circuit KD-56020, once it is triggered, the animal voice is broadcasted as signal which is amplified by Darlington-level with VT2 and VT3-l, then it drivies speakers b to emit sound.