Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

UGS-UP-Mini: A 25W SUSY Amp
UGS-UP-Mini: A 25W SUSY Amp
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 8th August 2018, 02:27 PM   #11
aspringv is offline aspringv  Australia
diyAudio Member
 
Join Date: Sep 2010
Location: Sydney, NSW
UGS-UP-Mini: A 25W SUSY Amp
Quote:
Originally Posted by EUVL View Post
See also (single-ended, simplified) :
Pass HPA-1, what do we know?
(Post #10)


Patrick
Thanks! And great documentation too. Now I'm reading up about cascoding current mirrors... So thanks again!
  Reply With Quote
Old 8th August 2018, 05:50 PM   #12
needtubes is offline needtubes  United States
diyAudio Member
 
Join Date: May 2003
Quote:
Originally Posted by aspringv View Post
May I ask why the choice of the bias circuit? As opposed to any of the other options?
As EUVL pointed out, the TL431 bias circuit essentially comes from the F4. Generg successfully used a variation with thermistors in his F4 Beast, so I opted to do the same since I wanted to try the circuit without source degeneration.
  Reply With Quote
Old 8th August 2018, 05:56 PM   #13
needtubes is offline needtubes  United States
diyAudio Member
 
Join Date: May 2003
Quote:
Originally Posted by Luke View Post
Would it be easy to allow for a separate front end regulator as in cheffs ups amp?
Yes and no... The boards I designed don't allow for this, since my goal was to simplify the build as much as possible. But, one could certainly design it in, at the cost of having to use higher overall voltage rails or two separate voltages for input and output stages.
  Reply With Quote
Old 8th August 2018, 06:21 PM   #14
Itsmee is offline Itsmee  England
diyAudio Member
 
Itsmee's Avatar
 
Join Date: Feb 2009
Quote:
Originally Posted by aspringv View Post
Nice project! I've been considering doing something similar, but... All I've done is thought about it!
Ditto, I'm only half done with the PCB layout.

Sign me up for boards if and when available.

With a little modification, it could be the ultimate universal PCB, UGS UP to Sony V FET front via BA3(B), F5(T&X) etc.

If there is a wish list, option for a cascoded current mirror please.

And only 1 PCB for the store to stock.
  Reply With Quote
Old 8th August 2018, 08:36 PM   #15
Dennis Hui is offline Dennis Hui  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
UGS-UP-Mini: A 25W SUSY Amp
Quote:
Originally Posted by Itsmee View Post
And only 1 PCB for the store to stock.
That would be pretty neat.

One board to rule them all?
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old 8th August 2018, 08:53 PM   #16
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
After building the Borbely EB602 and comparing against essentially identical V-MOS versions, I have to agree with Erno.
Lateral FETs just sound better, unless you only want lots of bass.
The Borberly EB602-200 Revisited

So if I have to use this topology (single-ended, i.e. not balanced), I would just build the UTHAiM power amp.
UTHAiM -- Just for Fun
(Post #11)


Patrick
__________________
xen-audio.com

Last edited by EUVL; 8th August 2018 at 09:05 PM.
  Reply With Quote
Old 8th August 2018, 09:25 PM   #17
needtubes is offline needtubes  United States
diyAudio Member
 
Join Date: May 2003
I very seriously considered using laterals. In fact, my original layout was for laterals. Ended up with the usual IRF parts because I have a couple hundred of them in stock already measured for Vgs. Plus, they are cheaper and generally easier to obtain.

I do look forward to trying amps like this with laterals some time down the road when I can justify the cost.
  Reply With Quote
Old 8th August 2018, 09:30 PM   #18
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Read the review in Post #4 of the EB602 thread, and the Didden interview :
https://linearaudio.nl/sites/lineara...nalsMMM508.pdf


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 8th August 2018, 09:32 PM   #19
needtubes is offline needtubes  United States
diyAudio Member
 
Join Date: May 2003
Quote:
Originally Posted by Itsmee View Post
Sign me up for boards if and when available.
Well, I have several boards left over from my initial run, if you are interested in trying the amp as presented in the first two posts.

Quote:
With a little modification, it could be the ultimate universal PCB, UGS UP to Sony V FET front via BA3(B), F5(T&X) etc.

If there is a wish list, option for a cascoded current mirror please.

And only 1 PCB for the store to stock.
This was my original project idea - large output boards for the 5u UMS heatsinks with plug-in driver board so that I could try different front ends. Sounds like Mr. Pass may have this in the works for the DIY store (see AB100 thread), so I decided to try out the "down-sized" version instead for some summer fun while we wait for his offering. Just happened to coincide with a need for a smaller, cooler running amp.
  Reply With Quote
Old 9th August 2018, 03:48 AM   #20
aspringv is offline aspringv  Australia
diyAudio Member
 
Join Date: Sep 2010
Location: Sydney, NSW
UGS-UP-Mini: A 25W SUSY Amp
Quote:
Originally Posted by needtubes View Post
Well, I have several boards left over from my initial run, if you are interested in trying the amp as presented in the first two posts.



This was my original project idea - large output boards for the 5u UMS heatsinks with plug-in driver board so that I could try different front ends. Sounds like Mr. Pass may have this in the works for the DIY store (see AB100 thread), so I decided to try out the "down-sized" version instead for some summer fun while we wait for his offering. Just happened to coincide with a need for a smaller, cooler running amp.
May I take you up on that? I've a small spare chassis that might be ideal and some large 15V secondaries transformers... And plenty of smoothing caps, so this might be a fun quick project for me.
  Reply With Quote

Reply


UGS-UP-Mini: A 25W SUSY AmpHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
susy opamp- nice PreSapian Digital Line Level 1 21st April 2014 03:34 PM
Is this SUSY tech? buzzforb Pass Labs 5 26th July 2011 03:24 PM
Four for SuSy? Onvinyl Pass Labs 24 24th July 2005 04:56 PM
A Question about SuSy and the X2 metalman Pass Labs 5 1st April 2005 03:55 AM
HELP Cannot read the Susy patent akira Pass Labs 5 2nd December 2002 08:19 PM


New To Site? Need Help?

All times are GMT. The time now is 06:13 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki