Low current anti-theft alarm circuit diagram

Published:2011/9/15 22:35:00 Author:Rebekka | Keyword: Low current anti-theft alarm | From:SeekIC

Detector RPY86 is produced by Mullard, and it only makes responses to the wavelength which isgreater than 6μm. It has not any response to thebackground light caused by sunlight and the sun. In order to gather infrared light onto the detector, it uses cheap mirror instead of Lens. μA776 is a programmable operational amplifier, and its bias current is only 300μA, which can be recharged by a small battery. Ra should be selected carefully, and the first operational amplifier's input voltage is 2 ~ 6V. Only when the thieves walk around the monitored area, the changes caused by the incident light will makethis circuit pull the alarm relay RL.



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