The human body sensor lights with LM358 designing

Published:2011/6/27 5:07:00 Author:Ecco | Keyword: human body, sensor lights , designing | From:SeekIC

The infrared sensors, signal amplifier circuit, voltage comparator, delay circuit and sound alarm circuit form the human body sensor lights with LM358 designing. IC1 infrared detection sensor can detect the infrared radiation signals in front of the body, and the output pin ② of IC1 outputs weak electrical signals, which is amplified by the first-class amplification circuit composed of transistor VT1, then input to the op-amp IC2 and done the high-gain, low-noise amplified, then this time the pin ① of IC2 outputs enough strong signals. IC3 is used as a voltage comparator.



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