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The circuit employs the functions of reed switches to produce a gate alarm that is powered by a universal AC/DC power supply. The circuit employs the functions of reed switches to produce a gate alarm ...

With a visually appealing and functional design, SDC door prop alarms are compatible with all access control systems but can also function as a stand-alone solution. Now you can condition access ...

We are in a digital era! Now we can add some intelligence to our doors and gates without too much investments. Just assemble this little door timer circuit built around a few cheap and simple ...