Economical circuit of an electronic alarm, notifies you when your door or window is open, is presented here. This circuit wired around the Quad 2-input NAND Schmitt trigger IC 4093 (IC1) can be ...

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 ...

Improve security with a cost-effective EA-708 door prop alarm from SDC. All of SDC's door prop alarms feature audible sirens with adjustable timer settings, two outputs, bypass status indicator light, ...

The armored MET-CDS Curtain Door Switch from TANE ALARM PRODUCTS, featuring a reversible mounting assembly,a 36” armored cable and a 3.15” GAP, is designed for installations on tractor trailer roll up ...