Pairs of resistors in opposite directions - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 8th January 2013, 06:38 PM   #21
diyAudio Member
 
Join Date: May 2010
Location: was Chicago IL, now Long Beach CA
There is a small reduction of coupling inductance and capacitance by winding in sections. Using two in series is like winding in sections.
  Reply With Quote
Old 8th January 2013, 09:45 PM   #22
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Two resistors in series will have exactly the sum of their resistances and approximately the sum of their inductances. This may be smaller or larger than the inductance of one resistor of the total value, but larger is perhaps more likely.
  Reply With Quote
Old 8th January 2013, 09:45 PM   #23
Mikha is offline Mikha  Russian Federation
diyAudio Member
 
Join Date: Mar 2011
Location: Moscow
Noise. Parallel connection of resistors to reduce noise, the value of which depends on the current.
  Reply With Quote
Old 8th January 2013, 11:00 PM   #24
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Johnson noise is the same, it just depends on the resistance. Ditto excess noise, it only depends on the applied voltage which is the same for any parallel combination.

And, of course, it's pretty much meaningless at these voltage levels. If one wants to reduce it to zero, a wirewound resistor is the best choice.

Good review: https://dcc.ligo.org/public/0002/T09...rent_noise.pdf
__________________
The more you pay for it, the less inclined you are to doubt it.- George Smiley
  Reply With Quote
Old 8th January 2013, 11:37 PM   #25
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
In short: carbon comp aside, there is damn little you can argue against modern resistors. That anything obeys Ohm's Rule (it should hardly be called a law, most things don't obey it!) at all is quite remarkable, and that resistors do, so well, so precisely and over so many orders of magnitude in voltage, current and frequency, is probably unmatched in electrical engineering, and perhaps in all other engineering disciplines as well. (Well, okay, perhaps astrophysics has us beat with something like the mass of a planet in orbit -- that could be a pretty pure gravitational tone in the nanohertz, and just imagine how little Johnson noise a 10^24 kg "capacitor" will have, even at that frequency! But then, I specified _engineering_, and I don't see no astronomers pulling planets into new orbits, do you? )

Tim
__________________
Seven Transistor Labs
Projects and Resources
  Reply With Quote
Old 9th January 2013, 02:36 AM   #26
Mikha is offline Mikha  Russian Federation
diyAudio Member
 
Join Date: Mar 2011
Location: Moscow
In most cases when you see a proud inscription "Hi End," you have to forget about engineering...
  Reply With Quote
Old 9th January 2013, 09:15 AM   #27
diyAudio Member
 
Robert Kesh's Avatar
 
Join Date: Oct 2012
You guys should just do this

Click the image to open in full size.

Just make sure you have reversed the helix's orientation to the resistor's.
  Reply With Quote
Old 9th January 2013, 09:36 AM   #28
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
I can see vendors , selling Beyschlag's - sorted to left and right ones

"... combine them in parallel , as seen on TV! "

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 9th January 2013, 10:26 AM   #29
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
At least the EM field conserves parity, so a left-hand wind and a right-hand wind are the same apart from polarity. If we had to do electronics using the weak interaction it would be much more fun, as that violates parity!
  Reply With Quote
Old 9th January 2013, 10:31 AM   #30
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
if you place them around xtall , then they're really useful
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  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
Trans with two pairs of primaries and two pairs of secondaries = two transformers Apuesto Paul Power Supplies 1 1st April 2012 05:16 PM
2 pairs of 3" fullrange, some tweeters, and 2 pairs of PE Alesis buyout woofers tuxedocivic Swap Meet 0 18th August 2011 09:36 PM
Opposite moduli expoy composite Alain Favret Multi-Way 1 29th August 2006 08:57 PM
400+ 5% carbon comp resistors 1/8-2W 1% or better matched pairs available sdedalus Swap Meet 3 22nd June 2006 04:31 AM


New To Site? Need Help?

All times are GMT. The time now is 09:12 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2