[SOLVED] having problem with laser alarm

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can you post the schematic of your circuit ?
 

after 741 opamp ,pl put a 555 timer in the bistable mode so that the unit can be reset with cancel button..
at point of interference ,you get the bistable into set stage and buzzer keeps ON till you hit the reset.
 

Can I use a different kind og comparator instead the 741 ?
 

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