Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

New "Kit" on the Block - BrianGT /LM3886 Upgrade
New "Kit" on the Block - BrianGT /LM3886 Upgrade
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
Thread Tools Search this Thread
Old 1st November 2013, 01:09 AM   #71
ChristianThomas is offline ChristianThomas  United Kingdom
diyAudio Member
Join Date: Feb 2006
Location: On a hill, in a wooden shack, next to the woods, in Somerset.
Originally Posted by davym View Post
I would have to get some sent over from the US, that can get very expensive.

If I can get some fairly cheap, I might have a go at winding some for low values but inductance issues could be a problem. I'll look into it a bit further.
Yes, inductance will be an issue, even for low values. This is why Sfernice resistors are something like 6 a pop in singles.

Low TC is important but you can also achieve the same end (not changing the resistance) in a number of ways, one of which is paralleling them up.

It is also worth noting that if your TCs and power dissipation don't match in a feedback loop, even if one is brilliant, you have lost the battle already. And, if you are going this far then you had better look at the 3900ppm TC of the copper on your track, which dwarfs the whole lot.
  Reply With Quote
Old 4th November 2013, 04:14 AM   #72
jameshillj is offline jameshillj  Australia
diyAudio Member
Join Date: Feb 2005
Location: Melbourne
You might ask the guys at LCI if they have any of the Manganin wire still available - this is the 'old stuff' that was made by Isabellenhutte quite a few years ago - the Rhopoint resistors from England have a similar sound particularly in comparison to the Z-foils that sound similar to the Isotan/Constantan wire, and are also about the price of those Sfernice ones.
  Reply With Quote
Old 4th November 2013, 06:16 PM   #73
davym is offline davym  Scotland
diyAudio Member
Join Date: Jul 2013
Location: The Wetback
This is something I intend to have a go at but it's probably going to have to wait a bit now, too much going on and Christmas is coming up far too fast. Uriah sent me a link to an article about winding resistors, doubling up the wire to reduce inductance.

  Reply With Quote
Old 4th November 2013, 06:29 PM   #74
tubesguy is offline tubesguy  United States
diyAudio Member
Join Date: May 2002
Location: Madison, WI
Hey Uriah - I've got one of these amps sitting unused in the basement. Count me in if you do the GB, probably for boards and bits.

Happy to hear that you're doing well - Pat
  Reply With Quote


New "Kit" on the Block - BrianGT /LM3886 UpgradeHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Building an LM3886 BrianGT Kit -- Questions wes-ninja250 Chip Amps 10 29th September 2005 01:35 PM
BrianGT snubber power supply upgrade PMeade Chip Amps 3 7th May 2005 02:45 AM
BrianGT's LM3886 board, and hiss Russ White Chip Amps 9 20th March 2005 09:10 PM
BrianGT's LM3886 Kit scott_jcp Chip Amps 11 4th March 2005 08:07 PM
FS: BrianGT gainclone kit. LM3875 Dual Mono Kit mattjk Swap Meet 3 16th November 2004 01:24 AM

New To Site? Need Help?

All times are GMT. The time now is 04:38 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio