Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders.

---

[ Follow Ups ] Thread: [ Display  All  Email ] [ Tube DIY Asylum ]

---

[ Alert Moderator ]

---

Not quite true.

Posted by kurt s on April 9, 2007 at 12:22:34

In Reply to: Re: help understanding twisted pair cabling posted by danlaudionut on April 9, 2007 at 00:30:13:

>>The main purpose for twisted pair
is the hum rejection which doesn't happen
when both wires have signal.
Not a problem as long as you have the wires
perpendicular to any AC wires it passes IMO.
You do have an increase in capacitance between
the wires but since you have a cap between
them any way so that's not a problem.<<

A twisted pair of wires is useful for a variety of purposes. Usually it is a signal in equal and opposite directions that are in these conductors with a generator at one end and a load at the other. Twisting the wires does all of the following: it increases capacitance between the conductors, reduces inductance down the conductors, it keeps the wire in maximal close proximity whereby it helps cancel emitted electromagnetic fields, and likewise helps cancel received electromagnetic fields from entering the circuit. The close proximity and opposite and equal electromagnetic fields of the two wires makes this happen. Hum rejection does happen even if one side is not grounded. The wires can both be floating and still cancel emitted or received hum.

It is not necessary to have one side grounded in a twisted pair to get benefit from twisting the wires, but it improves the situation. Then one side also serves additionally as an electrostatic shield, at least partially compared to coaxial cable.

Kurt

This post is made possible by the generous support of people like you and our sponsors:

Sonic Craft

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---