Aleph 3 balanced input - 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 30th May 2005, 01:47 PM   #1
Odysei is offline Odysei  Lithuania
diyAudio Member
 
Join Date: Jun 2004
Location: Vilnius
Default Aleph 3 balanced input

I can't find any thread with Aleph 3 balanced input schematics. I believe that it have already been discussed, but still can I ask for help?

I need to get Aleph 3 working with balanced input. As I can't find a suggestion I made my try. Will these my schematics drive Aleph 3 with balanced input or some values should be changed?

I need not to loose its original gain of 20db or make sounding worse, in fact few additional db won't be a bad idea.
Attached Images
File Type: gif aleph3-30hybrid.gif (5.0 KB, 589 views)
  Reply With Quote
Old 30th May 2005, 01:52 PM   #2
diyAudio Member
 
Join Date: Jun 2002
Location: CT
Look at the volksamp 30 on the Pass DIY site. Bill
  Reply With Quote
Old 30th May 2005, 01:56 PM   #3
fcel is offline fcel  United States
diyAudio Member
 
Join Date: Sep 2001
Location: LA County
Go here http://www.passlabs.com/downloads.htm Schematic is on page 16 under Aleph 30.
  Reply With Quote
Old 30th May 2005, 06:36 PM   #4
diyAudio Member
 
hifimaker's Avatar
 
Join Date: Oct 2003
Location: San Jose
Was the Aleph 3 (not Aleph30) ever manufactured with balanced inputs from the Pass Labs factory?

I thought there was such a version, perhaps a later version?

Thanks,

-David
  Reply With Quote
Old 31st May 2005, 11:10 AM   #5
Odysei is offline Odysei  Lithuania
diyAudio Member
 
Join Date: Jun 2004
Location: Vilnius
I know about Aleph 30, but I'm not interested in one. I need schematic update for Aleph 3 for balanced input support.

I made my try in the earlier post by converting Aleph 30 schemes to almost Aleph 3, but I'm not sure how will that work with Aleph 3

Could someone suggest something??
  Reply With Quote
Old 31st May 2005, 06:28 PM   #6
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally posted by dw8083
Was the Aleph 3 (not Aleph30) ever manufactured with balanced inputs from the Pass Labs factory?

I thought there was such a version, perhaps a later version?
The factory did not make a balanced Aleph 3, but you can easily
use the Aleph 30 input without penalty.
  Reply With Quote
Old 31st May 2005, 07:25 PM   #7
Odysei is offline Odysei  Lithuania
diyAudio Member
 
Join Date: Jun 2004
Location: Vilnius
Quote:
Originally posted by Nelson Pass


you can easily
use the Aleph 30 input without penalty.
Hm, and what about input gain? How will it change from standart Aleph 3, using 30's input?
  Reply With Quote
Old 31st May 2005, 10:43 PM   #8
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally posted by Odysei
what about input gain? How will it change from standart Aleph 3, using 30's input?
It's the same as I recall. The SE input impedance is higher on
the 30, but the BAL input is lower.
  Reply With Quote
Old 31st May 2005, 11:50 PM   #9
Banned
 
Join Date: Mar 2005
Location: Australia
mr Pass you dont use coupling caps at the input while others do
is it because you assume that the preceding preamp is using caps or
is biased at oV for dc coupling
i am confused what is the standard who assumes what the other
is using, however to be 100% sure shouldnt you use coupling cS
at the input?
  Reply With Quote
Old 1st June 2005, 08:04 PM   #10
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
I do use a coupling cap in the feedback loop to reduce
the gain at DC. The circuit works fine without it, although
the offset is higher, its drifts more, and of course you want
to be careful about offset in the source.
  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
PP to balanced input wicked1 Tubes / Valves 7 25th February 2009 10:21 PM
Aleph P 1.7 / Aleph 1.2 Balanced IC Question SRMcGee Pass Labs 2 25th March 2007 04:16 PM
ESP 101 with balanced/unbalanced input Cloth Ears Solid State 2 17th June 2006 11:12 AM
Balanced Input Stage Bukitoo Solid State 5 11th March 2004 03:03 AM
[P68] Balanced input??? Tazzy Solid State 9 8th February 2003 12:52 PM


New To Site? Need Help?

All times are GMT. The time now is 09:32 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