uncleflo
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Tutorial on back EMF suppresion: its causes and its cures.
Saved by uncleflo on July 17th, 2014.
Physical electronic access control, almost always, involves driving an electromagnetic locking device of some kind. It might be a powerful magnet or a smaller solenoid within a strike. All these devices are subject to the same basic laws of physics. The electromagnet will store energy when powered and will generate a “back EMF”, or counter EMF (CEMF), when the supply is switched off.
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