[sdiy] power cables

Oren Leavitt obl64 at ix.netcom.com
Fri Aug 16 05:24:19 CEST 2019


On 8/15/19 9:45 PM, Youssef Menebhi wrote:
> Hi everybody,
>
> I've been building my own circuits for a little while now and have
> just switched to a new power supply/connector arrangement. I use
> bipolar power, plus and minus 12v.  What I've noticed, though, is that
> when I use headphone cable (shielded ground) to pass power, I get a
> small hum at the output. When I use even thinner gauge cable, I don't
> get hum. Unfortunately, it's hard to get a hold of the ultra-thin
> gauge cable.  Am I out of luck? Does anyone have any idea why this
> might be happening?
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Hi Youssef,

Sounds like you may have a ground loop somewhere. It may be that the 
thinner cable has enough internal resistance to break the loop. If you 
can track down the source of the loop and fix it, you'll leave yourself 
free to use heavier gauge wire for the power connections.

May two bits



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