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  1. C

    Hall Effect sensor

    Hi all, I have a student who is after making a coin recognition system for an electronic money box. Heard that a hall effect sensor can be used to recognise the field effect of different coins passing by it. Has anyone done any work in this area and can point me in the right direction...
  2. C

    Opto slot interface

    Hi all I am trying to construct an opto slot interface for controlling a motor driven mechanism. can't find a circuit anywere. can anyone help?
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