[sdiy] twisted pairs?

[Jim Patchell]

Using twisted pairs is a very good thing...however...they are not magic. 
  You will probably find that just wiring one signal with a twisted pair 
is not going to change things a whole lot...(on the other hand...you 
have to start somewhere...and you might get lucky).  Grounding and 
signal routing is kind of an art and a science.  There is a right way 
and a wrong way.

I can not give you a whole lot of guidance here...partly because it is 
difficult for me, at least to explain.  Took me a while to learn how to 
do this...(I learned by the trial of fire...my first design job...design 
a system that worked with signals in the nano-volt range).

I always approach the problem by remembering that current flows in 
loops, and to always provide a path for current to flow in a complete 
loop.  A twisted pair wire helps to do this.  Current flow one way in 
one conductor to the load, and returns back in the other wire back to 
the source.  The concept is simple...but it does take a bit of thinking...

-Jim

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?
> 
> if so...i just might try to spend the last few hours before delivering this project adding additional bypass caps and twisting up some pairs for audio lines.
> 
> thanks
> 
> 
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