Burning Amp BA-3b (Balanced) - Page 22 - 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 23rd April 2012, 09:23 PM   #211
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by Darry View Post
Hello,

I need balanced inputs for the front end of BA3 connected with the official BA # 1 single-ended output stage.

What do you think of this schematic?

Thank you for your answers

Regards

Darry
ZM, I am confuzed. How does the negative side affect the signal? This presents a learning opportunity, as I have not seen this before.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 23rd April 2012, 09:27 PM   #212
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
see it as balanced to unbalanced converter
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 23rd April 2012, 09:40 PM   #213
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Does it just accept the signal and throw it away? What benefit, if any, is there.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 23rd April 2012, 09:49 PM   #214
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
benefit ......... besides already mentioned conversion from balanced input to unbalanced output stage , is everything you get with symmetry in stage , along with special shaping of THD content

if that's not enough significant , I don't know what is
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 23rd April 2012, 10:55 PM   #215
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
i get the practical part of a balanced signal and all that you gain in terms of transmission along interconnects and harmonic cancelation within an amp, but what i do not understand is how it is happening in this amp. What ia happening with the negative signal and how does it affect the final signal leaving the FE from the positive side. I think it is time to go draw some squiggly lines on a schematic and stare
__________________
...Shape the sound , Man!
  Reply With Quote
Old 23rd April 2012, 11:08 PM   #216
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally Posted by buzzforb View Post
....... I think it is time to go draw some squiggly lines on a schematic and stare
couldn't agree more ........

just be aware of fact that whatever happens to your left leg is always influencing your right leg ....... and the other way ;

take that analogy to this circ

you can jumping on one leg , but hardly without swinging with other one
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 23rd April 2012 at 11:11 PM.
  Reply With Quote
Old 30th April 2012, 04:51 AM   #217
diyAudio Member
 
Join Date: Oct 2006
If I wanted to get the dissapation of the output stage (ba-2) down to 300w when used in balanced configuration, would the only options be either half the rail voltage or have the bias? I guess neither one of these is very desirable. Thanks for any input..this whole balanced thing is very new to me, but it would be nice to pair up with the bufflo dac.

Dave
  Reply With Quote
Old 30th April 2012, 09:01 AM   #218
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Balanced ClassA bias current is tied explicitly to speaker impedance.

If you adopt 16ohm speakers then the dissipation can be halved.

I'll remind you of the "rule" for balanced and bridged amplifiers: They deliver twice the power into twice the impedance.
__________________
regards Andrew T.

Last edited by AndrewT; 30th April 2012 at 09:05 AM.
  Reply With Quote
Old 2nd June 2012, 01:01 PM   #219
Banned
 
Join Date: Nov 2006
I will be making up balanced BA3 FE connected to BA1 output, BA2 output, and circlotron output.

The plan is to put the front end in it's own case with shunt regulator (most likely a Salas shunt) and the output stage in another case with CRC power supply.

For the BBA3-BA1 output, I am thinking +/- 22V supplies and 5A per output phase for a total of 10A drawn from the power supply. So it is definitely going to be monoblocks.
Has anyone tried this yet?

Last edited by Melon Head; 2nd June 2012 at 01:09 PM.
  Reply With Quote
Old 2nd June 2012, 01:06 PM   #220
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
ya can bet that Papa did

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  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
Burning Amp BA-3 Backbones Pass Labs 1695 3rd July 2014 12:25 AM
Burning Amplifier BA-2 Variac Pass Labs 1125 1st July 2014 01:39 PM
Burning Amplifier BA-2 Nelson Pass diyAudio.com Articles 5 14th September 2011 06:11 PM
WTB: Burning Amp BA-1 or BA-2 jdubs Swap Meet 0 23rd March 2011 03:16 AM
FS: two burning amps (one each BA-1 and BA-2) without drivers Eric Weitzman Swap Meet 15 17th February 2010 02:35 AM


New To Site? Need Help?

All times are GMT. The time now is 03:08 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