Broken Charger-connection Alert - RED - Page86              

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Broken Charger-connection Alert - RED - Page86

FSM Resource ID: 16736, this is the Broken Charger-connection Alert - RED - Page86 . It was submitted by admin on Sun Mar 11 2007 and has been visited/downloaded 15 times to date.


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    TIME TO DUST INDICATOR - Circuits designed by David A. Johnson, P.E. I thought about this circuit when I heard that a lot cleaning personal in hotels were either dusting rooms more often than necessary or not enough. I have not yet built and tested this circuit completely but in concept it should work. The circuit draws very low current from a +3v battery and could be housed in a package similar to a small ashtray. The assembly might be placed in a suitable out of the way area to collect dust. It would alert a maid when....

    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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