The video shows a demonstration of how the mass of a magnet can be used to phase lock it against a rotating field. In essence, the magnet will want to rotate to align with the rotating magnetic ...

As for the (un)locking mechanism, [Alastair] did consider a mechanical lock attached on the door’s back side, pulled by a wire attached ... A fail-safe magnetic lock hooked up to an Arduino ...

These include a louder 75 dB voice annunciation, packaging the lock with a 90 dB remote sounder ... CX-DE1200 Series EXIT WATCH delayed egress magnetic locks. These include a louder 75 dB voice ...