Metal detector repair/rebuild

Discussion in 'The Projects Forum' started by Lectraplayer, Apr 21, 2015.

  1. Lectraplayer

    Thread Starter Member

    Jan 2, 2015
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    I'm looking to repair or rebuild a metal detector. It's actually a fairly simple Radioshack model, but it has gotten to where it sounds at all times, even when I hold it up in the air in the woods and spin all the knobs. I haven't used it enough to get that farmiliar with it either. While I know basically how it works with the magnetic exciter and reciever coil, I'm not sure which wire on the coil is which yet. What does this behavior sound like, with it sounding constantly, a shorted receive coil?

    Worse comes to worst, this may turn into a resonant comparator. I don't see why I can't detect phase and amplitude shift through the coil(s) to determine what is near the coils. Iron would be one way, copper the other.
     
  2. wayneh

    Expert

    Sep 9, 2010
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    You'll get better feedback if you supply more details; model, schematic, pictures, whatever you can. Could be as simple as a low battery?
     
  3. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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  4. Lectraplayer

    Thread Starter Member

    Jan 2, 2015
    77
    5
    It's a relabeled Radioshack (whatever manufacturer) unit. Cat #63-3005. I didn't think about the batteries until Wayneh brought them up, but I still have 9.4 volts on 6 AAs with it sounding. Not sure where to tune it or discriminate it at.
     
  5. Lectraplayer

    Thread Starter Member

    Jan 2, 2015
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    5
    I guess I can't post pictures...
     
  6. wayneh

    Expert

    Sep 9, 2010
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    All I can find so far is the parts list here.
     
  7. Lectraplayer

    Thread Starter Member

    Jan 2, 2015
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    5
    No help here... I would like to know technical specs (or at least a wiring diagram) for the search coil. I'm wondering if I have an open.
     
  8. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    my first suggestion would be shotgun replacement of all electrolytic capacitors.
     
  9. wayneh

    Expert

    Sep 9, 2010
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    Next up would be a good picture of the PCB.
     
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