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The multi-function alarm circuit composed of wireless receiv

2016-11-18 03:11  
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The multi-function alarm circuit composed of wireless receivers
Working principles The circuit is shown in Figure 1, of which the wireless remote module A1 and battery G1, power supply SA1 compose the emitter; the wireless remote receiving module A2, analog sound integrated circuit A3 and so on compose the reception alarm.Usually, the aerial in A1 can emit the ultra-high magnetic wave of 250~300MHz into the around space, in the effective range, the wave is received by the micro reception aerial in module A2, and then it is modulated, amplified, detected, delayed and LEV converted by the internal circuit, finally, the pin outputs a low LEV.