Low noise shunt referene? - 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
Thread Tools Search this Thread
Old 16th December 2013, 10:09 AM   #1
diyAudio Member
Join Date: Jun 2007
Default Low noise shunt referene?

The attached image is the noise density plot from the onsemi tl431 datasheet.


Does anybody know of a better or comparable shunt reference availble in a sot23 or similar package?

Attached Images
File Type: png onsemi_tl431.png (39.1 KB, 151 views)
  Reply With Quote
Old 16th December 2013, 11:00 AM   #2
diyAudio Member
Join Date: Dec 2005
Location: Kuala Lumpur
That is about the same noise density as that of a 140k resistor, so I suspect a green LED or a zener would be much better
  Reply With Quote
Old 16th December 2013, 11:03 AM   #3
diyAudio Member
Join Date: Dec 2012
Location: Athens
It also depends on how accurate you need the reference to be. I use LM329. It is quite low noise, and stable enough.

A led should be very good, but I can't say it would certainly be rock stable. So you might tell us how critical the application is.

Have a look at this thread too:

Zener vs Led as reference
  Reply With Quote
Old 16th December 2013, 11:06 AM   #4
diyAudio Member
abraxalito's Avatar
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 145
Send a message via Yahoo to abraxalito
The plot for the Sipex TL431 is marginally better. What's the application? When I need lower noise than the TI TL431 (considerably worse on paper than the OnSemi), I'll parallel them and/or filter the output.
Attached Images
File Type: png sipex-tl431.png (14.3 KB, 139 views)
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
  Reply With Quote
Old 16th December 2013, 11:29 AM   #5
diyAudio Member
Join Date: Oct 2007
Location: Denmark
Hi - I would also suggest a LED (green, orange, yellow) combined with a CCS and a good capacitor(s) for decoupling. Yet i don't know you application ...

If LEDs are a possibility for you you might find Christer's measurements interesting (attachment)


Attached Files
File Type: txt diode støj-målinger vers. 4.txt (14.5 KB, 44 views)
"... It is always possible to be friendly ..." HH the Dalai Lama.
  Reply With Quote


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
Low noise, low microphony, low hum valves MarcelvdG Tubes / Valves 38 28th January 2013 08:42 PM
Erno Borbely All FET low-noise super shunt regulator lujunweilu Power Supplies 2 8th December 2010 04:02 PM
preamp supply LOW power LOW noise LOW cost drdagor Power Supplies 1 13th September 2010 11:39 PM
Help with dual PS noise shunt? cuibono Power Supplies 15 22nd March 2008 08:00 PM
Help with Shunt Regulation and Noise dsavitsk Tubes / Valves 30 24th December 2007 06:11 PM

New To Site? Need Help?

All times are GMT. The time now is 03:04 AM.

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