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microphone and headset jack insulating washers

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Fri Oct 28, 2011 7:48 am Post subject: microphone and headset jack insulating washers

I just drilled a 3/8" hole for my headset jack in my aluminum panel of my aluminum airframe. The threaded barrel fits through just fine. I then grabbed the pair of insulating washers I'd gotten from B and C. The shoulder washer has an ID of ~3/8", so it slips over the jack just fine. Then I realized that to insulate the jack from the airframe, the hole looks like it needs to be 1/2" for the shoulder part of the washer to fit through the hole.



I thought I'd read that only a 3/8" hole is required. But if that's the case, there's no room for a washer and the outside of the jack would touch the metal, grounding it to the airframe.



I also read that some folks have not bothered with isolating washers and there hasn't been any problems with ground loops.



So if I'm going to use the insulating washers I'll have to see if I've now got enough room for 1/2" holes and drill to that size.

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