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A new type of audible notification signal was introduced in the 2012 version of NFPA 72 that employs a low-frequency sound — in the 520 Hz range — when appliances are installed where people sleep. If ...

This Design Idea shows how a single microcontroller port can drive a lot of output lines through shift register. In this case we use the shift register with strobe control to achieve perfect output ...

Audible & visual (AV) signaling devices are a range of signaling systems specifically designed for use in industrial environments, which are characterized by harsh conditions and are prone to risk of ...