Simplest BOSOZ current source? - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 2004, 09:39 AM   #1
scrazy is offline scrazy  Taiwan
diyAudio Member
 
Join Date: Apr 2001
Location: Taiwan
Question Simplest BOSOZ current source?

I know there are many ways to add constant current source to BOSOZ
But which one is simplest when using +-60v ?

Is this one suitable in BOSOZ?

thanks
  Reply With Quote
Old 4th August 2004, 09:59 AM   #2
Gaucho is offline Gaucho  Canada
diyAudio Member
 
Gaucho's Avatar
 
Join Date: Mar 2004
Location: Stuck in the 80's
It should work perfectly. I'm sure you know, but as drawn the dissipation on R12 is over 1/4 watt....
  Reply With Quote
Old 4th August 2004, 01:44 PM   #3
eLarson is offline eLarson  United States
diyAudio Member
 
eLarson's Avatar
 
Join Date: Aug 2002
Location: Gaithersburg, MD
That's the topology I used in mine. It worked beautifully. At the same time it allowed me to use lower rail voltages, seemingly without penalty. (Seemingly = didn't measure it, but I couldn't hear any degradation in my room.)
__________________
Would a woodchuck bother to chuck MDF?
  Reply With Quote
Old 8th August 2004, 01:10 PM   #4
Henrik is offline Henrik  Denmark
diyAudio Member
 
Join Date: Feb 2002
Location: Copenhagen Denmark
Hi scrazy

Your circiut have a gain of about x70, that is way too much, and that is because you have shortend the sources. And you have about 30 Volt bias across R5 and R8, not that it matters in this case, but they arn't really needed. But if you want to lover the negatieve rail voltage to say 8v you have to remoove them. In order to get less gain you need some resistance between the sources to get x10 or something like that.


The scematic could look like the one I have attached.

Best regards Henrik.
Attached Images
File Type: jpg untitled-1.jpg (67.4 KB, 249 views)
__________________
Henrik
  Reply With Quote
Old 8th August 2004, 09:12 PM   #5
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
If you want to reduce noise a bit, consider putting a small to moderate sized electrolytic across the Zener. It's not really necessary, but it's a cheap, easy way to improve the circuit. The cap need not be a serious audiophile-grade part, as the voltage across it is DC.

Grey
  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
Aleph-type current source, but source follower this time tschrama Pass Labs 4 29th July 2005 12:55 PM
BOSOZ source switching with SE relays Gabrielshorn Pass Labs 2 5th February 2004 08:07 AM
current source... costiss Tubes / Valves 10 31st December 2003 12:47 AM
Source follower electret mike -> use with current source? capslock Solid State 1 28th February 2003 12:54 PM
R21? and Current Source AC Current Gain macka Pass Labs 9 20th May 2002 08:58 PM


New To Site? Need Help?

All times are GMT. The time now is 06:18 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