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555 radio wireless remote control switch additional device c

2016-11-12 06:41  
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555 radio wireless remote control switch additional device circuit
As the figure 14-1 shows, this additional device has a medium-wave amplitude modulation transmitter and a tape recorder additional circuit. When you are remote controlling, this device will launch a short amplitude modulation pulse (<1 second), so the remote control switch turns on; if it launches a long pulse (>2 second), the remote control switch turns on to remote control all sorts of home appliances, the effective distance is 6-12 meters. The audio oscillator is composed of the VT1 and R1,C1,T1, the high-frequency oscillator is composed of the VT2 and T2, C2, C4, R2 to send out the audio modulation high frequency pulse signal, the pulse width depends on the press-time of AN1.