Reply to thread

Message

<blockquote data-quote="DidUHearThat?" data-source="post: 5778236" data-attributes="member: 594758">On low power/sensitive signal wires, like line level audio, twisting the positive and negative wire pairs is one method of reducing noise, by increasing rejection.&nbsp; Any noise, or capacitance, that is encountered is received equally by both the positive and negative wires.&nbsp; That noise current is then canceled out at the destination because it is recieved in equal portions of negative and postive = zero.Before sheilded balanced audio lines became standard in pro audio, twisted pairs were the main method of rejecting noise in audio lines.Same principle applies to co-axial audio lines.&nbsp; Co-axial and balanced lines have almost completly replaced twisted pairs in audio.This is not needed for higher current speaker, power or signal lines.As someone else mentioned this may also be used to prevent unwanted electrical fields from interfiering with sensitive lifesaftey equipement, like flight or medical instruments. Shielding them would be even better.There is no point in twisting wires that aren&#039;t used in positive/negative pairs, or you won&#039;t get the cancelation effect.&nbsp; For standard alarms you would only send the signal wires and a common ground (or negative triggers and a common positive).&nbsp; So the cancellation would not work.Induced inline noise would be a non-issue anyway.</blockquote>

[QUOTE="DidUHearThat?, post: 5778236, member: 594758"] On low power/sensitive signal wires, like line level audio, twisting the positive and negative wire pairs is one method of reducing noise, by increasing rejection. Any noise, or capacitance, that is encountered is received equally by both the positive and negative wires. That noise current is then canceled out at the destination because it is recieved in equal portions of negative and postive = zero. Before sheilded balanced audio lines became standard in pro audio, twisted pairs were the main method of rejecting noise in audio lines. Same principle applies to co-axial audio lines. Co-axial and balanced lines have almost completly replaced twisted pairs in audio. This is not needed for higher current speaker, power or signal lines. As someone else mentioned this may also be used to prevent unwanted electrical fields from interfiering with sensitive lifesaftey equipement, like flight or medical instruments. Shielding them would be even better. There is no point in twisting wires that aren't used in positive/negative pairs, or you won't get the cancelation effect. For standard alarms you would only send the signal wires and a common ground (or negative triggers and a common positive). So the cancellation would not work. Induced inline noise would be a non-issue anyway. [/QUOTE]

Verification