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Old 11th September 2012, 08:38 AM   #1
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Default Twisted pair ?

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.
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Old 11th September 2012, 08:44 AM   #2
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the latter. twist together a wire and its return path, eg (output & gnd) or (speaker+ & speaker-)
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Old 11th September 2012, 08:51 AM   #3
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ok mate thank you.
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Old 11th September 2012, 09:08 AM   #4
AndrewT is offline AndrewT  Scotland
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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.
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Old 11th September 2012, 11:01 AM   #5
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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.
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Old 11th September 2012, 12:33 PM   #6
AndrewT is offline AndrewT  Scotland
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Not plaited, twisted.
The cores run much closer together when twisted and that reduces the inductance.
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Old 11th September 2012, 12:42 PM   #7
marce is offline marce  United Kingdom
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As well as protection against EMI.
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Old 11th September 2012, 01:11 PM   #8
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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.
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Old 12th September 2012, 12:49 PM   #9
marce is offline marce  United Kingdom
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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.
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