[sdiy] twisted pairs?

[harrybissell at wowway.com]

I run all wires from the PCB to the pots and jacks, then isolate them
at the metal panel. Makes me feel good....   :^)

H^) harry



On Mon, 01 Dec 2008 19:56:52 -0800, David G. Dixon wrote
> I'm not sure about the theory, but wrapping signal wires with ground 
> wire in one of my circuits virtually eliminated the noise that the 
> signal wires were broadcasting to the rest of my circuit.  However,
>  I was careful only to ground one end of the ground wire; the other 
> end was unconnected.  I don't know if this matters or not.
> 
> Since then, I've taken to running ground leads from PCBs to panel 
> pots, rather than running ground wires from pot to pot on the panel, 
> just so I can twist the ground wires around the others.  Maybe I'm 
> deluding myself, but it makes me feel good.
> 
> David G. Dixon
> Professor
> Department of Materials Engineering
> University of British Columbia
> 309-6350 Stores Road
> Vancouver, B.C.  V6T 1Z4
> Canada
> 
> Tel 1-604-822-3679
> Fax 1-604-822-3619
> 
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> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of George 
> Hearn Sent: Monday, December 01, 2008 2:13 AM To: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] twisted pairs?
> 
> Twisting two wires together and running them through the instrument together
> means (in theory) that both wires will experience the same pickup of 
> noise and interference.  By taking the differential between the two 
> wires at the receiving end one is able to reject the common mode 
> signal (the noise).  In my opinion, twisting a ground wire with your 
> signal is not likely to do an awful lot and you'd be better off just 
> using the ground as a shield.  George
> 
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of John 
> Mahoney Sent: 29 November 2008 16:03 To: Dan Snazelle; sdiy Subject: 
> Re: [sdiy] twisted pairs?
> 
> At 07:49 AM 11/29/2008, Dan Snazelle wrote:
> 
> >i was reading in the art of electronics that an ordinary twisted 
> >pair can reduce some digital clocking noise.
> >
> >i was wondering if all this is is twisting a wire connected to 
> >ground with the wire you are trying to protect?
> 
> Yes, I believe that's it.
> 
> John
> 
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Harry Bissell & Nora Abdullah 4eva