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

Using constant current source as voltage regulator
Using constant current source as voltage regulator
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 4th August 2012, 06:46 AM   #11
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: The great city of Turnhout, BE
Quote:
Originally Posted by CBS240 View Post
I do this often and it works great. But like Jan said, any variance in current pulling off of the voltage reference will vary the reference. So I like to use it in this manner...

Cascode the low Gm J-fet with the high Gm J-fet to get a more acurate Idss. Use a J-fet gate as the load on the voltage reference to steer the differential. (the N-Jfet and the P-Jfet act like a diff amp in this arrangement) If much higher output voltage is needed, you can always add another cascode to the J201. Way better than using noisy Zeners for a voltage reference IMO.

Nice. Any measurements for us to compare to a purpose-designed voltage reference driven by a CS? I would be interested in Zout over freq and nosie levels.

Note to Phisci: this is also a reference build from a current into a resistor, but the difference with your idea is that here there is a negative feedback loop that modifies the current source 'strength' to compensate for reference changes with load changes (and a few other things), and thereby stabilizes the ref voltage.

jan
__________________
Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan
Linear Audio pubs and articles . The SilentSwitcher now at diyaudio store SilentSwitcher. Keeping in touch with SY.

Last edited by jan.didden; 4th August 2012 at 06:49 AM.
  Reply With Quote

Reply


Using constant current source as voltage regulatorHide 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
Constant current source for low voltage. digits Construction Tips 5 19th June 2011 09:59 AM
Why is it not a Constant Current Source ? payloadde Power Supplies 3 17th April 2011 09:59 PM
Do I still need a regulator for constant current draw? Sunsun22 Power Supplies 2 7th March 2011 11:47 AM
Heaters Constant Current Regulator Joshua_G Power Supplies 18 18th November 2010 08:31 PM
constant current source hacknet Solid State 19 13th March 2006 02:46 PM


New To Site? Need Help?

All times are GMT. The time now is 09:47 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki