Hmm... maybe a clip on hall effect thingie?
Hall effect - Wikipedia, the free encyclopedia
edit: $11 from mouser, not clamp on but looks pretty straight forward:
http://www.tamuracorp.com/clientuplo...L18PXXXD15.pdf
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WINDMILLS DO NOT WORK THAT WAY!!!
Last edited by dcb; 03-04-2009 at 09:29 PM..
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