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    Need hepl on modifying transmitter receiver circuit with GSM

    **broken link removed** hi Guys im currently working on a project of child care alarm. The project consist of 1 pair of infrared sensor and GSM software with modem. whenever there is small kid go through the infrared sensor the alarm will sound and send sms to the parents. Does anybody have any...
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    IR receiver circuit design

    sry i forgotten to post on my circuit,and thx hussong1555 Thx Guys=D
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    IR receiver circuit design

    Hi guys, 1st of all thx for taking your time. I'm now doing a project on IR sensor, and i would like to combine two IR sensor together(including two sets of tramitter and receiver), i'm going to link the two receiver circuit together to work with XNOR gate and a buzzer. In the sense of once...

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