Twisted pair ?

[littlerick]

Been looking for info on twisted pair wiring... Now i get the general idea but not sure about connecting. Do I twist a pair of wires for each channel and connect both wires to one terminal or is it the two cables... positive and ground that i twist as a pair and connect each single end to a terminal.

 

[Terry Given]

the latter. twist together a wire and its return path, eg (output & gnd) or (speaker+ & speaker-)

 

[littlerick]

ok mate thank you.

 

[AndrewT]

Yes, the flow and return pair get twisted together.

There is an exception.

A dual polarity Power Supply Unit (PSU) has three output leads, +ve, -ve and zero volts.
These three wires must be twisted together as a triplet.

 

[Terry Given]

Andrew, yeah, that works great.

I got my wife to plait such cables for me, before eventually figuring out how to do it myself.

And some guys at the Auckland University school of Engineering have published a couple of papers on using traditional Maori weaving techniques to braid many litz cables into wide, flat braid for use in big (100kW+) HF resonant converters for inductive power transfer.

 

[AndrewT]

Not plaited, twisted.
The cores run much closer together when twisted and that reduces the inductance.

 

[marce]

As well as protection against EMI.

 

[Terry Given]

Andrew, you are quite right. plaiting looks prettier, and makes a nice flat cable. it also holds itself together without cable ties/heatshrink/etc. but the loops are bigger.

 

[marce]

TWISTED PAIR, the name give you a clue, the whys and reasons of how it works can be found all over the internet, even as to why x number of twist per metre.