1/8 inch stereo jacks not insulated but metal

Discussion in 'General Electronics Chat' started by relicmarks, Oct 23, 2009.

  1. relicmarks

    Thread Starter Active Member

    Oct 13, 2006
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    i bought these small 1/8 inch stereo jacks that are metal and not plastic which are shorting out to the chassis encloser box

    The problems i'm having is
    1.) They have a metal threaded area that is shorting out to the chassis

    I tried using electrical tape on the inside and outside of the chassis to keep it from shorting out , but the inside of the chassis where the jack barrel goes through is shorting it out , how can i put insulation to keep it from shorting
    out?

    Its really hard finding plasic nuts and washers for 1/8 inch jacks , i only can find metal ones

    Another problem is:
    2.) The threaded barrel part is not "long enough" to put a nut , the chassis is to thick for these small stereo jacks

    What can i do?
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Normal stereo jacks are designed so that the barrel is grounded.

    If for some reason you absolutely have to have the barrel insulated from ground, then drill the hole quite a bit oversized, and epoxy in a piece of fiberglass to mount the jack through.
     
  3. relicmarks

    Thread Starter Active Member

    Oct 13, 2006
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    yes the barrel has to be isolated from ground

    Is there any other way than to epoxy in a piece of fiberglass
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    Why does it have to be insulated from the chassis?

    Could you change the enclosure to a plastic one?
     
  5. relicmarks

    Thread Starter Active Member

    Oct 13, 2006
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    it creates a short and causes the circuit not to work

    Ya i can't change it to a plastic one
     
  6. SgtWookie

    Expert

    Jul 17, 2007
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    Why don't you change your circuit so that only the tip and ring are necessary to make the connections?
     
  7. relicmarks

    Thread Starter Active Member

    Oct 13, 2006
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    i need all three terminals of the pot
     
  8. SgtWookie

    Expert

    Jul 17, 2007
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    OK, so if you can't find suitable insulating washers that will allow you to install the nut for the jack, and you don't want to drill a larger hole and epoxy in a chunk of fiberglass or PCB to insulate the jack from the chassis, then install a rubber grommet in the hole and use a free-floating inline jack on a piece of shielded audio cable.
     
  9. relicmarks

    Thread Starter Active Member

    Oct 13, 2006
    355
    0
    yes i think the grommet idea might work out good

    Thanks

    1/8 inch grommet
     
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