Obnoxiously loud subway-gate alarms are returning to some stations as part of a pilot program to stop farebeaters, according to transit officials. The ear-splitting emergency-exit sirens — which irked ...

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 ...

Commuters trying to escape a crowded subway exit bottleneck have come to accept those abominable emergency door alarms as an infuriating fact of life. But the New York City Transit Riders Council says ...

Say goodbye to 2014 — and those annoying subway emergency-gate alarms. The Metropolitan Transportation Authority confirmed Wednesday that it has completed the task of deactivating approximately 1,500 ...

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The YL-333 Magnetic Antitheft Alarm is an easy to install security alarm system for doors and windows. This battery-operated device works on the principle of magnetic proximity detection. It can ...

Ever accidentally left your front door ajar and had a pet escape? [BlackCow] came up with a simple solution to this problem. The circuit is fairly rudimentary but a great example of using the basics ...