Simple Symetrical Amplifier - Page 153 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 28th November 2011, 03:38 AM   #1521
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
Quote:
Originally Posted by cats squirrel View Post
Hi Marc

nichrome wire is made of Nickel and Chromium, and has a relatively high resistivity, and therefore resistance, depending on diameter.
Look here for typical values: wires.co.uk : Bare Nickel Chrome / Nichrome Section
I have had good results with Costantan wire which has a better TC than NiCrome - this wire sounds better that any commercially available resistors I have tried. Ideal for low values. I have been using this wire in my amps as o/p degeneration & o/p resistors / fuses for years.

wires.co.uk : Copper Nickel / Constantan / Eureka Section

But I am informed that manganin is considered better that constantan: even lower TC and also much less nickel in the mix and thus less "magnetic" but I didn't try it yet.

WIRES.CO.UK MANGANIN

Last edited by mikelm; 28th November 2011 at 03:41 AM.
  Reply With Quote
Old 28th November 2011, 07:51 AM   #1522
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
Mike,

Can you solder these special wires?

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 28th November 2011, 08:59 AM   #1523
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
Hi Hugh,

I have done a long term chemical analysis ( I would not know how ) but the Constantan wire seems to solder without problems - Havn't used my Manganin yet
  Reply With Quote
Old 28th November 2011, 09:51 AM   #1524
diyAudio Member
 
Esperado's Avatar
 
Join Date: Jul 2011
Location: France
Quote:
Originally Posted by AKSA View Post
Can you solder these special wires?
They are Copper alloys. But i wonder about thermal dissipation and corrosion ?
__________________
Ultimate Protection and more.The Only Source of Knowledge is experience, everything else is just information” ©A. Einstein
  Reply With Quote
Old 28th November 2011, 10:00 AM   #1525
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
My coils of constantan are more than 5 years old and the appearance has not changed in that time.
  Reply With Quote
Old 28th November 2011, 02:24 PM   #1526
diyAudio Member
 
SOUND_Rays's Avatar
 
Join Date: Mar 2009
Quote:
Originally Posted by mikelm View Post
My coils of constantan are more than 5 years old and the appearance has not changed in that time.
NAIM uses same solution for years

Attached Images
File Type: jpg NAP250..jpg (79.2 KB, 508 views)
  Reply With Quote
Old 28th November 2011, 03:09 PM   #1527
diyAudio Member
 
Join Date: Feb 2011
Location: Devon, UK
seems like a nice project for someone, there!

My partner uses nichrome wire as elements in her kiln, which has been up to 1100°C and back again virtually every other day for ten years without problem!
  Reply With Quote
Old 28th November 2011, 04:12 PM   #1528
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Our company has used it as shunt (load-sensing) resistors for 50 years. Nickel/chrome does not corrode and can be soldered. The wire resistor will outlast the solder joint.
__________________
Kindest regards
Nico
  Reply With Quote
Old 28th November 2011, 07:47 PM   #1529
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Interesting events development, Alex didn't accepted my board proposal (too densely populated), so it looks we will have the SSA BIGBT HP PCB design competition here hehehe.

Lots of fun ahead yeah.
Attached Images
File Type: jpg SSA BIGBT HP PCB.jpg (501.2 KB, 446 views)

Last edited by Lazy Cat; 28th November 2011 at 07:51 PM.
  Reply With Quote
Old 28th November 2011, 08:08 PM   #1530
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
... and just for a comparison, the one (too big for me) who's gonna be developed further by Alex. I wonder mhmm
Attached Images
File Type: jpg SSA BIGBT HP Silk Screen White.jpg (717.9 KB, 407 views)
  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
Symetrical schematics are alike plague in Brazil, do you like them? destroyer X Solid State 151 1st July 2010 03:09 PM
Symetrical out low Zout karsten21 Tubes / Valves 5 1st February 2010 11:19 PM
going balanced/symetrical - what benefits? weissi Solid State 15 20th October 2007 09:06 AM
Symetrical field, is this? Raka Multi-Way 6 14th September 2003 02:21 PM
Non-symetrical SMPS output cm961 Parts 4 21st August 2003 11:27 PM


New To Site? Need Help?

All times are GMT. The time now is 10:04 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