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Proximity controlled circut

  1. Feb 25, 2005 #1
    I'm looking for some examples/ideas on how to control the current to an electromagnet based on the height something is levitating above it.

    Schematics would be nice, but even any ideas/sensor recommendations would be appreciated.
    or any similar application, ive seen something does using an IR emitter/detector but that wouldnt be the best application for this.

  2. jcsd
  3. Feb 27, 2005 #2
    Why Not?

    You are going to have to measure the height somehow and light is a good and relatively simple way to do that and it in no way disturbs the action
    it does not Have to be IR.
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