The infrared sound/light alarm circuit

Published:2011/7/1 23:23:00 Author:Borg | Keyword: infrared, sound/light alarm | From:SeekIC

In the figure is the infrared sound/light alarm circuit.The circuit consists of the AND gate circuit, single steady time delay circuit, 4 lines of infrared emitter and the reception circuit, trigger and 2-color light circuit, stereo alarm circuit and so on. The alarm is used in alarm area, and the range is shown in the figure. The infrared LED HF1～HF4 and the coupling pipes BG1～BG4(3DU31) compose 4 pairs of emitting and receiving warning lines.If someone is passing the warning line, the infrared ray is blocked, so the corresponding coupling pipe is blocked and the NAND inputting a high LEV.



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