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Old 14th June 2012, 06:12 PM   #1
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Default Microphonic DIY Interconnect Suggestions?

I recently built a set of single silver conductor shielded interconnects. I used teflon tube slightly larger than the silver wire on the assumption that a little air around the wire would add to the insulating powers of the teflon. Not sure if the rest of the construction matters, but the layers went: silver/teflon tube/teflon tape/copper conductor/larger teflon tube/copper drain/aluminum foil/shrink tube.

Anyway, to my dismay I've discovered that the interconnects are microphonic. If I bump or even touch them I hear it. I assume (!) it's the movement of the silver in the airspace of the smallest teflon tube. Has anyone here come across this? I hate to take them apart and modify them only to find the airspace wasn't the issue.
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Old 14th June 2012, 06:19 PM   #2
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Perhaps the connector itself are oxide coated inside them???
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
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Old 14th June 2012, 06:19 PM   #3
SY is offline SY  United States
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Yes, I have. Tribolectricity is my hypothesis- the cure is the same, use polypropylene or vinyl instead of Teflon.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 14th June 2012, 09:32 PM   #4
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Tribolectricity -- had to look it up. Silver and teflon are the worst pairing apparently. Well, damn! I think I'll try pulling off the plug ends, sliding out the solver wire, and somehow reinsulating it before sliding it back into the teflon. Excellent ideas! Yours, not mine. Thanks.
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Old 15th June 2012, 02:55 AM   #5
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My contribution to this site...if anyone is interested.

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Old 15th June 2012, 06:40 AM   #6
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Used cotton tube.
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Old 15th June 2012, 10:19 AM   #7
DF96 is offline DF96  England
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So are we saying that the favourite (for some) conductor and the favourite (for some) insulator don't work well together, at least for a home-made (loosely structured?) cable? How unfortunate! Maybe I will stick to my cheap copper in PVC interconnects.
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