confused about unbalanced/balanced - 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 2nd September 2006, 08:21 PM   #1
roger-k is offline roger-k  Norway
diyAudio Member
 
Join Date: Mar 2004
Location: Karmøy in Norway
Question confused about unbalanced/balanced

Now I have made-up the PCB for P1,7 so much soldering remains.

I have read a lot of unbal/bal in many forums here, but I'm still confused about balanced inputs since all of my sources not have balanced outputs. I know it is just to short the negative input to the ground, but when I do this:
Will I still use the whole amp or just the "half"?
__________________
Roger
  Reply With Quote
Old 3rd September 2006, 12:06 PM   #2
diyAudio Member
 
john-china's Avatar
 
Join Date: Feb 2001
Location: where fair living
because another half is fuctional , it can affect whole circuit.

you can still use whole circuit
__________________
Maybe i should not be lazy again
  Reply With Quote
Old 3rd September 2006, 02:12 PM   #3
flg is offline flg  United States
diyAudio Member
 
flg's Avatar
 
Join Date: Jul 2005
Location: North East
It depends on your input following the pre... The use of balanced as much as possible is bennificial. The 1.7 is very good at converting S.E. to balanced. If you drive a balance Pwr Amp input you would get good results If you are not, I'm not sure you will be much better than BOZ
  Reply With Quote
Old 3rd September 2006, 05:33 PM   #4
roger-k is offline roger-k  Norway
diyAudio Member
 
Join Date: Mar 2004
Location: Karmøy in Norway
OK....
One reason for the confusing is this:
http://2bak.homepage.dk/mybosoz.gif

Is this right? I think there is one stage on the left side and one on the right side of the schematic. Both are inverted so the input - is going to be the otput+ and vice versa.
Am I right?

If I'm not right, what is meaning with Q2, it vill never be trigged.
__________________
Roger
  Reply With Quote
Old 3rd September 2006, 06:33 PM   #5
flg is offline flg  United States
diyAudio Member
 
flg's Avatar
 
Join Date: Jul 2005
Location: North East
I see
Well, I think that removing the load components of the unused output may alter performance in a negative way
Like I said before though, I'm not sure there is much benifit to the BOSOZ with S.E. input and S.E output
You may experience less 2nd harmonic distortion than the BOZ though, due to the differential function still contibuting somewhat
  Reply With Quote
Old 4th September 2006, 02:30 AM   #6
Formerly "jh6you". R.I.P.
 
Babowana's Avatar
 
Join Date: Jul 2006
Quote:
Originally posted by roger-k



Both are inverted so the input - is going to be the otput+ and vice versa.
Am I right?


I think that unbalanced-in and unbalanced-out of BOSOZ would keep the 2nd harmonics that BOZ has. And, compared with BOZ, the benefit is that we could have better symmetrical sine waves of output signal swing.

And, +in sees +out . . .

If I'm correct, Papa . . .
  Reply With Quote
Old 4th September 2006, 02:41 AM   #7
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
Actually, the idea of using a differential like that is just peachy. Like a cascode, a differential renders the capacitance of the input device moot.
The input device is essentially used as a follower. Since the Source tracks the Gate pretty much one for one, you're not trying to charge/discharge the various capacitances of the input device. The ouput device delivers the voltage gain. Since it receives its signal via the Source you're in a whole 'nother realm as far as what capacitances are being charged and discharged. The cool thing is that the "follower" front end can supply all the current you might need to drive the other device.
It's non-inverting, which is always nice.
Note for the record that this is a case where I would probably use a CCS to bias the thing, even though I usually approach current sources with caution.
In short, yeah, it'll work and work well if properly executed.

Grey
  Reply With Quote
Old 4th September 2006, 02:58 AM   #8
Formerly "jh6you". R.I.P.
 
Babowana's Avatar
 
Join Date: Jul 2006
Quote:
Originally posted by GRollins



Like a cascode . .


Yeah, slipping through the fingers of the blood-sucking capacitance . . .
Your short writing always bring me better understanding . . . thanks.
  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
Still confused about balanced/unbalanced. leadbelly Everything Else 4 14th January 2008 10:05 AM
Unbalanced to Balanced mcash257 Parts 3 14th October 2004 12:03 AM
unbalanced/balanced/unbalanced conversion using transformers vladimir Solid State 10 27th February 2003 06:54 PM
unbalanced or balanced theturtle Everything Else 4 5th January 2003 04:52 PM
Zen Balanced Line Stage Balanced vs Unbalanced macka Pass Labs 28 11th December 2002 06:18 AM


New To Site? Need Help?

All times are GMT. The time now is 10:42 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