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General Wireless Alarm Launch and Receiving Circuit

2016-11-16 12:22  
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General Wireless Alarm Launch and Receiving Circuit
General Wireless Alarm Launch and Receiving Circuit
General Wireless Alarm Launch and Receiving Circuit
The circuit is showed as the picture and the transmitter is composed of wireless remote control launch module,A1 and battery G1 and the power switch SA1. Receiving alarm consists of wirless remote control receiving module,A2 andsimulated sound integrated circuit A3 etc. Usually,A1 module built-in antenna launches out into the surrounding space about 250 ~ 300 MHz frequency modulation electromagnetic wave.Within effective distance,the wave is received by tiny receiving antenna inside A2 module.The wave outputs low PWL after its modulatation,amplification,test ,delay and PWL change.A3 does not work because TG PIN's low PWL, acoustic device B has no voice.Once the receiving and launching distance exceeds 15mA2 will be not able to receive enough strong transmitting signal and then A2 low pin changes into high PWL,which tirggers inside circuit work of A3.