PIR motion detector circuit electronic project

Posted on Feb 6, 2014

The op-amp IC1D shapes the frequency response to amplify those frequencies produced when motion is detected and rejects all others, such as those due to noise or slow temperature changes. When IC1D outputs a voltage higher than 1. 67V, it forces pin 8 and pin 2 of IC1 to go high. A high in with one of these cases causes the output to go low and all

PIR motion detector circuit electronic project
Click here to download the full size of the above Circuit.

ows C9 to discharge through IC1A. The discharging of C9 will pull pin 6 of IC2 low and trigger the sound generator.

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