Enhanced Alarm Keypad              

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Enhanced Alarm Keypad

FSM Resource ID: 16745, this is the Enhanced Alarm Keypad Enhanced Alarm Keypad. It was submitted by admin on Sun Mar 11 2007 and has been visited/downloaded 12 times to date.


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    Sun-Up Alarm A collection of electronic circuits and projects to build.

    UNPLUGGED POWER CORD ALARM - Circuits designed by David A. Johnson, P.E. Many medical devices, such a portable X-ray and ultrasound equipment, carry their own batteries. However, the frantic pace of some hospital emergency rooms might cause the device to be shoved off into a corner without being plugged back into an AC power source to recharge their batteries. So, I designed this circuit to emit an audible alarm whenever the device’s power cord was unplugged from the wall for a period of time. The device was designed to snap onto the outside of a power cord, where it senses the AC electric field emitted. No direct connection to the internal wires of the power cord is needed. I also included a low battery voltage monitor.


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