UGS adventures - Page 110 - 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 7th February 2013, 10:46 AM   #1091
CeeVee is offline CeeVee  Portugal
diyAudio Member
 
CeeVee's Avatar
 
Join Date: Dec 2006
here u go...

Let us know how u go.
Attached Files
File Type: zip SoftUGS_Sources_V2.01.zip (113.9 KB, 108 views)
  Reply With Quote
Old 8th February 2013, 02:34 AM   #1092
diyAudio Member
 
Join Date: Mar 2007
Location: Bandung
Thanks.

Didiet
  Reply With Quote
Old 12th February 2013, 03:56 AM   #1093
rade95 is offline rade95  United States
diyAudio Member
 
Join Date: Apr 2010
Location: Boulder, Colorado
Default UGS module first test

Hello again, I am doing my first UGS module test and I am seeing about 6dB gain. What should be the gain of the UGS module? Attached are some pictures of my test: 1KHz square wave input / output signals.
Attached Images
File Type: jpg photo.JPG (147.4 KB, 316 views)
File Type: jpg photo_input.JPG (127.4 KB, 301 views)
File Type: jpg photo_output_1KHz.JPG (133.7 KB, 287 views)
File Type: jpg photo_PS.JPG (138.6 KB, 295 views)
File Type: jpg photo_UGS.JPG (156.0 KB, 276 views)
__________________
UGS pre, stock F5, PassLabs X2.5, Aleph P
  Reply With Quote
Old 12th February 2013, 08:12 PM   #1094
Maousse is offline Maousse  France
diyAudio Member
 
Join Date: Oct 2006
As Cheff said in this post gain can be adjusted with Rfb

I'm afraid original site is now down
Can't remind the gain

I see you are measuring unbal output, will you use UGS unbalanced ?

site is up http://psykok.dyndns.org/diy/preamp_ugs but no trace of expected gain

Last edited by Maousse; 12th February 2013 at 08:35 PM.
  Reply With Quote
Old 12th February 2013, 08:53 PM   #1095
Maousse is offline Maousse  France
diyAudio Member
 
Join Date: Oct 2006
if you read french : http://psykok.dyndns.org/diy/preamp_...les%20nuls.pdf

differential gain is 10.4dB, unbal is 4.4dB
seems you're OK (not same Rin and/or Rfb, I suppose)
  Reply With Quote
Old 13th February 2013, 03:04 AM   #1096
rade95 is offline rade95  United States
diyAudio Member
 
Join Date: Apr 2010
Location: Boulder, Colorado
Thanks Maousse, you are right I am testing unbalanced connection at the moment. Rin is 15K while the feedback Rfb is 56K like it is in v3. The finished amp will support both balanced and unbalanced inputs/outputs.

I am planning to use similar but different input selector and volume control then what Cheff used in his design, since I don't have the original PCBs. Details to follow. Could someone recommend a good frequency response SW for PC or MAC preferably open source. thanks a lot
__________________
UGS pre, stock F5, PassLabs X2.5, Aleph P
  Reply With Quote
Old 13th February 2013, 07:13 AM   #1097
diyAudio Member
 
Join Date: Jun 2006
when using unbalanced mode UGS v3 with unbalanced In+ to unbalanced Out+ Is It correct to ground In- and Out-
at first I was using UGS v3 with not grounded In- and Out- then I grounded In- and Out- and got more gain but for me the sound become somehow unplesant
are R In and R FB and R G the most critical resistors which got to be of highest quality

UGS adventures

Last edited by samoloko; 13th February 2013 at 07:20 AM.
  Reply With Quote
Old 13th February 2013, 07:21 AM   #1098
Maousse is offline Maousse  France
diyAudio Member
 
Join Date: Oct 2006
I use my Cheff's UGS All Inclusive in unbal/unbal config for now.
My amp has 29dB gain, that makes 1.2V sensibility.

Cheff's UGS gain is enough for my configuration, I guess it could be OK for you too.

About PCB's, the Gerber Files are on the site liked on my previous post. But cost can be high for just one set. I have a spare full set if you need (I keep it for my old days ^^)
  Reply With Quote
Old 13th February 2013, 07:24 AM   #1099
Maousse is offline Maousse  France
diyAudio Member
 
Join Date: Oct 2006
Please, never ground outputs !
Just ground inputs and it will be OK
I hope the modules are still OK. I remember something like 1.5W dissipation on some components (just a discussion I had few years ago, it's wayyy too much)
  Reply With Quote
Old 13th February 2013, 08:24 AM   #1100
diyAudio Member
 
Join Date: Jun 2006
If I have enough V out from source would lowering UGS R fb say from 56K to 47K bring benefits like lower distortion
  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



New To Site? Need Help?

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