Speaker wire okay from relay to speaker terminals? - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th June 2017, 12:43 PM   #11
JMFahey is offline JMFahey  Argentina
diyAudio Member
 
JMFahey's Avatar
 
Join Date: Mar 2009
Location: Buenos Aires - Argentina
There´s "proximity" and "proximity"
A couple parallel wires an inch away or more can have how much parasitic capacitance coupling between them? 1pF ... 5 pF? ... same as 0

Now if you tightly *twist* them, copper to copper may close down to 1 or 2 mm, with a nice plastic dielectric between them ... mutual capacitance can become 50 times as much, and become significant.

FWIW Radio transmitter gain stages used to be "neutralized" , meaning "made stable", by feeding back some RF out of phase and in a controlled way by using "gimmick capacitors" .... 2 short pieces of wire (and I mean *short*, 1/2" or less) , twisted together more or less tightly.
So wire to wire capacitance is a very real and useful phenomenon.

Notice value and position of the gimmick capacitor Cpk:
Click the image to open in full size.

Is a 0.1pF capacitor significant?

You bet

Quote:
You sometimes see such a connection made by means of a "gimmick" capacitor merely consisting of two wires twisted together.
Click the image to open in full size.
__________________
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
  Reply With Quote
Old 19th June 2017, 01:04 PM   #12
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Interchannel crosstalk from speaker wires is more likely to come from inductive coupling.

Twisting a pair of wires is likely to raise capacitance but this should not be a problem. Given that the load is low impedance when compared to the line characteristic impedance it is line inductance which dominates - and this is minimised by keeping the wires close together.
  Reply With Quote
Old 19th June 2017, 04:13 PM   #13
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Nothing is better than a good cheap superconductor. If below -270 °C, still better.
__________________
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.

Last edited by Osvaldo de Banfield; 19th June 2017 at 04:23 PM.
  Reply With Quote
Old 21st June 2017, 03:55 AM   #14
diyAudio Member
 
Join Date: May 2016
I have already twisted them into separate L/R pairs as I said, and they will travel to the terminals separately without contact.
Quote:
Originally Posted by DF96 View Post
I am not sure what the heatshrink is for - I would not bother. Keep some distance between the two channels; definitely do not twist them together!
They pass under a heatsink, it's hot (Class A).
Wouldn't exceed the temp-rating of the insulation though, so I can skip that if not needed or undesirable for some reason. I didn't have a temp rating for the other wire which is why I considered some secondary insulation initially.

I'll keep some distance between them as advised.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Where to buy tri/quad wire speaker terminals? insider9 Parts 14 24th May 2017 12:07 PM
output voltage at speaker terminals Shelah Solid State 30 5th July 2015 10:15 PM
Capacitors on/across Speaker Out Terminals 1965GTO Solid State 5 23rd April 2011 12:51 AM
resistor across speaker terminals mcmahon48 Multi-Way 6 23rd July 2010 05:47 PM
I’m looking for really good speaker terminals Progg70 Parts 8 4th July 2007 08:57 AM


New To Site? Need Help?

All times are GMT. The time now is 01:09 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki