Beam-break Detector For Camera Shutter or Flash Control


Posted on Feb 5, 2014

The IR detector (IC3) controls an LM 7555 CMOS timer (IC2) which operates in mono stable mode. When the beam is broken, IC2 is triggered and its pin 3 output goes high for about half a second. This extinguishes LED1 and turns on transistor Q1 to drive a 5V low-power relay


Beam-break Detector For Camera Shutter or Flash Control
Click here to download the full size of the above Circuit.




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