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The infrared monitor wireless alarm circuit

2016-11-01 18:47  
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The infrared monitor wireless alarm circuit
In the figure is the infrared monitor wireless alarm circuit. The circuit consists of the infrared monitoring emitter and the infrared reception circuit, two parts in total, which are shown in figure (a) and figure (b) respectively. Figure (a) adopts two CMOS 555 chips (or one 556), IC1 and IC2, the two outputs the waveforms of 1.5KHz and 35KHz respectively, of which the 1.5KHz square wave is used to modulate the loading wave. In the figure, IC1 is connected as a multi-resonance oscillator, whose oscillating frequency is 1.5KHz, and the corresponding charge/discharge time is decided by the time constant. The duty cycle of the square wave output by IC1 is 1:3 (160μs:500μs).