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electromagnet OPENING a door

Subject: electromagnet OPENING a door
From: "Sammy Taylor"
Date: Thu, 01 Dec 2005 07:29:03 GMT
Newsgroups: sci.electronics.basics
Hi,

I'm building a small safe with an electronic strike (i.e., latch). When a 
timer activates,
the strike releases. I want the door to pop open, and using a spring is
awkward. I thought a simple electromagnet might work. Can somebody suggest a
geometry.

Cheap strong electromagnets seem to be of the U-shaped variety. Can I use 
one
of these and a permanent magnet to repel each other? (I can't use two
permanent magnets because the pre-load on the strike can be enough to
prevent it from opening.)

Thanks for any help.

sammy 



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