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Old 11-10-2008 | 08:12 PM
  #65  
Bigboat
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From: Alkmaar, NETHERLANDS
Default RE: $25 CDI
Most common hallsensors are uni-polaire.
A uni-polaire needs only a south form the (neodymium) magnet to switch on / off
A bi-polaire sensor needs a south to switch on and a north to switch off.

http://parts.digikey.co.uk/1/1/87891...37-wl-7-b.html
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