resistance wire much better than 0.5ohm Caddocks ? - Page 2 - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

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 6th November 2004, 08:37 PM   #11
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
Well - I just replaced the 0.1 ohm thick film emitter degeneration resistors in my JLH class A type amp with 1" lenghts of the constantan wire.

seems to be the same kind of improvement - more smooth & fluid, more detail

This is worth trying.

In the UK this wire can be got from Maplin Electronics but as of yesterday they were out of stock.

It is 4.2 ohms per meter with works out about 0.1 ohms per inch

For values larger than 0.2 and less than 2.0 ohm I would suggest zig zagging it across a piece of blank vero board rather than winding which will increase inductance.

enjoy !
  Reply With Quote
Old 6th November 2004, 09:20 PM   #12
sss is offline sss  Israel
diyAudio Member
 
sss's Avatar
 
Join Date: Jul 2003
Location: Israel , haifa
Send a message via ICQ to sss
whats a constantan wire?
  Reply With Quote
Old 6th November 2004, 10:03 PM   #13
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
Quote:
Originally posted by sss
whats a constantan wire?
Well it's a special blend of metals which I believe was developed for making one half of thermocouples

i.e. two disimilar wires ( insulated ) that when twisted together and joined at one end produce a temperature dependant voltage at the other end which can be plugged into a module that will give a calibrated reading or some other logical function

For our purposes it is wire that, at least in the UK, and hopefully elsewhere, is easlily available, that has a resistance per meter that depends on the gauge.

for more info I suggest that you google...

mike
  Reply With Quote
Old 6th November 2004, 10:06 PM   #14
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
Perhaps if this is not common - fuse wire might be a good alternative.
  Reply With Quote
Old 6th November 2004, 10:35 PM   #15
mikelm is offline mikelm  England
diyAudio Member
 
Join Date: May 2003
Location: England
Send a message via Yahoo to mikelm
I just found this UK website for all your wire needs ( including constantan )

http://www.wires.co.uk/

and more specifically

http://www.wires.co.uk/acatalog/COPPER_NICKEL.html

I guess there will be similar sites elsewhere.
  Reply With Quote
Old 7th November 2004, 05:20 AM   #16
sss is offline sss  Israel
diyAudio Member
 
sss's Avatar
 
Join Date: Jul 2003
Location: Israel , haifa
Send a message via ICQ to sss
thanx
  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
WTT: Dale RH-50 7.5ohm 1% For Fets HIPCHECK Swap Meet 3 19th January 2007 01:06 PM
Wire Resistance / Ohms per foot Info John Biles Everything Else 0 11th August 2005 01:03 PM
caddocks t. Parts 0 20th November 2004 11:18 AM
caddocks now a measly $3 Jules Swap Meet 5 29th February 2004 02:00 PM
Add Series Resistance of the Wire in TS measurement? r_s_dhar Multi-Way 1 27th July 2002 11:06 AM


New To Site? Need Help?

All times are GMT. The time now is 07:05 PM.


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