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Fan natural wind simulation and music accompaniment control

2015-03-03 08:04  
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Fan natural wind simulation and music accompaniment control circuit
It is composed of relaxation oscillator, pulse counting frequency doubling circuit, SCR control socket circuit, music sound circuit and AC buck rectifier circuit and other components. When it issues the simulated natural wind, it is also accompanied by 12 international songs to give the joy of beauty. VT1 uses unijunction transistor BT33, and it forms form a relaxation oscillator with R1 ~ R3, C1, etc.