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Re: GFCI creates amplifier noise?

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Re: GFCI creates amplifier noise? g.a.miller 05-07-2006
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Posted by g.a.miller on May 7, 2006, 1:20 am

> After the last one had me going, I can't wait to see how this one
> transpires..
> Searcher
>
The last one In retrospect dumping the salt OUT OF the bags into wheel
barrow ( clean) spreading around the pool with shovel might of been a better
idea, to bad I didn't think of that.



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Posted by Ben Miller on May 18, 2006, 10:25 am
> wrote:
>
>>A friend reports if she plugs her amp into her outdoor GFCI outlet she
>>gets noise, plugged into any other outlet no noise at all.
>>
>>can a GFCI cause this? I dont mind replacing it, but havent seen this
>>trouble before. will plug my oputlet tester in to check it but the home
>>is recently purchased and passed home inspection, so i doubt its miss
>>wired
> Not for sure ,but it sounds like a possiableground problem or the amp
> is picking up some interfernce from antoher device that is on the same
> circut. Try unplugging motorized devices one at a time and see if the
> noise stops
> Best Regards
> Anthony
>

GFCIs inject a half-wave ac signal on the neutral and ground lines, in order
to detect a N-G fault downstream. This is probably causing the noise. The
solution is to use a non-GFCI receptacle for sensitive electronics.

Ben Miller

--
Benjamin D. Miller, PE
B. MILLER ENGINEERING
www.bmillerengineering.com
>
>
> ................................................................
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Posted by Ben Miller on May 18, 2006, 10:26 am
The
> solution is to use a non-GFCI receptacle for sensitive electronics.

Let me clarify this. Relocate the amp. Don't eliminate the outdoor GFCI.

Ben Miller



--
Benjamin D. Miller, PE
B. MILLER ENGINEERING
www.bmillerengineering.com



Posted by on May 18, 2006, 1:13 pm

Ben Miller wrote:
> The
> > solution is to use a non-GFCI receptacle for sensitive electronics.
>
> Let me clarify this. Relocate the amp. Don't eliminate the outdoor GFCI.
>
> Ben Miller
>
>
>
> --
> Benjamin D. Miller, PE
> B. MILLER ENGINEERING
> www.bmillerengineering.com

That was my thought too, that the injected signal from the GFCI may be
the source of the problem. But one would think that the signal would
be designed so that it would not cause problems with properly
functioning power supplies in electrical eqpt. So, it seems possible
the real problem may be with the amp.


Posted by Chris Lewis on May 18, 2006, 1:30 pm

> Ben Miller wrote:
> > The
> > > solution is to use a non-GFCI receptacle for sensitive electronics.

> > Let me clarify this. Relocate the amp. Don't eliminate the outdoor GFCI.

> > Ben Miller

> That was my thought too, that the injected signal from the GFCI may be
> the source of the problem. But one would think that the signal would
> be designed so that it would not cause problems with properly
> functioning power supplies in electrical eqpt. So, it seems possible
> the real problem may be with the amp.

Manufacturers always try to cheap out on manufacturing costs. Removing/
reducing filtering (that most people won't notice the lack of) is one
way to reduce manufacturing costs.

Eg: "cheap" dimmers make more electrical noise than the premium ones.
This will be the same with GFCIs.

Theoretically, there are certain limits on how far they can go (eg:
FCC limits on EMI), but some manufacturers will skim as close as
they can, and other manufacturers will aim higher.

So, a GFCI from a different "line" or manufacturer _might_ help.

But I tend to agree - sounds more like an inadequately filtered amp.

A line filter from Radio Shack or such like may be the best approach.

It is _remotely_ possible that there's a grounding problem on the
outlet (which in most cases the GFCI would catch, but....). A outlet
test might be a good idea.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.

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