Transformer based voltage gain + unity gain stage? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 10th August 2010, 12:15 PM   #1
diyAudio Member
 
soundcheck's Avatar
 
Join Date: Mar 2005
Location: D
Default Transformer based voltage gain + unity gain stage?

Hi folks.

I am planing to do a bit of reengineering on my system.

Currently I am running a Sabre 32 (Buffalo) passive SE into a Tripath 2021B
feeding my 98db/W SPL speakers. All SLA driven. Sounds quite nice.

What's causing me headaches is the questionable performance of the opamp on the input and the losses associated to the outputfilter-inductors.

I am now thinking of using an output transformer of e.g. 1:4 (6,4V) on the DAC to go out differential. Voltage gain would be done by the transformer.

On 8R speakers I'd end up with approx. 5,2W if using an unity-gain-amp.
I think that should be OK.
A 2nd secondary on the transformer I could even use for feeding my subwoofer crossovers.

What I can think of for amplifcation is a nice differential unity gain amp
with a high input impedance and dc-coupled replacing my Tripath amp.
The amp should work on +-12V supply rails and be of highest quality.
Feedback should be avoided if possible. It should not be too complicated to build.


I'd really appreciate any hints or advise on above idea. ( I don't have too much background on amp-design ).


Thx.

Cheers
  Reply With Quote
Old 10th August 2010, 12:21 PM   #2
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
have a look through the thread
Some other Source Follower COnfigurations
__________________
regards Andrew T.
  Reply With Quote
Old 10th August 2010, 02:44 PM   #3
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
It is difficult to avoid feedback if you want a unity gain amp. The obvious circuit, source/emitter follower, has very high levels of feedback although all within one stage.
  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
A Heretical Unity gain line stage SY Tubes / Valves 86 26th April 2013 10:18 AM
Power Amplifier - Pre Amplifier Unity gain - Voltage gain - where as royal way ? tiefbassuebertr Solid State 9 9th June 2011 06:49 AM
heretical unity gain OUTPUT stage... andrew_whitham Tubes / Valves 4 9th December 2006 03:36 AM
Heretical Unity Gain line stage PLUS a little gain ? yagas Tubes / Valves 7 24th January 2006 01:30 PM
Line stage preamp, based on SY's "Heretical Unity gain line stage" Danko Tubes / Valves 23 18th July 2005 04:07 AM


New To Site? Need Help?

All times are GMT. The time now is 10:36 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