I know it goes against current wisdom but... - 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 April 2004, 02:32 AM   #1
diyAudio Member
 
Join Date: Mar 2004
Location: aberdeen, uk
Send a message via AIM to martinab2 Send a message via MSN to martinab2 Send a message via Yahoo to martinab2
Default I know it goes against current wisdom but...

Switch mode power supplies and single ended transistor amps can sound really good. There, I've said it! I'm currently using a 2n3055 / tip31 darlington SE amp powered by a modified atx supply - see http://www.mthain.dsl.pipex.com/mickey.html. Has anyone else tried this - Either my ears have gone faulty or I'm onto something interesting. Give it a try and let me know what you think
Click the image to open in full size.
  Reply With Quote
Old 10th April 2004, 03:01 AM   #2
diyAudio Member
 
Bill Fitzpatrick's Avatar
 
Join Date: Jun 2001
Location: Eugene, OR
Two bad links out of two. Not bad.
  Reply With Quote
Old 10th April 2004, 04:06 AM   #3
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Quote:
Originally posted by Bill Fitzpatrick
Two bad links out of two. Not bad.

Take off the period...
http://www.mthain.dsl.pipex.com/mickey.html

the link works for me


--
Brian
  Reply With Quote
Old 10th April 2004, 04:48 AM   #4
HDTVman is offline HDTVman  United States
diyAudio Member
 
Join Date: Aug 2001
Location: Chicago area
I did something along these lines 30 years ago.

Parallel LM741s driving a 2n3055 as an emitter follower with a 50 watt Dale wire wound resistor as the current source. The power supply was not a switcher but a big transformer with a CLC filter.

As I remember it sounded very good for a 4 watt amp burning up about 75 watts. It got so hot in about 20 minutes that you couldn't touch it. Fans would have helped a lot I'm sure.

Later BZ
__________________
What ever makes the tunes flow
  Reply With Quote
Old 10th April 2004, 08:03 AM   #5
hacknet is offline hacknet  Singapore
diyAudio Member
 
Join Date: Nov 2002
Location: sg
looks very much like A BJT zen lite.
  Reply With Quote
Old 10th April 2004, 10:37 AM   #6
diyAudio Member
 
Join Date: Mar 2004
Location: aberdeen, uk
Send a message via AIM to martinab2 Send a message via MSN to martinab2 Send a message via Yahoo to martinab2
Yes, It's very much along the Zen lite theme - the amp circuit isn't unusual at all, but building it with a computer power supply makes it very inexpensive and nice and quiet (apart from the fan noise that is). Just a bit of fun really but I have built a few for friends and it has to be one of the cheapest ways of getting into SE class A. A lot more musical that your average cheapie integrated amp in my opinion.

Since drawing the schematic I tried moving things around with the lamp between the emitter and ground and the collectors connected directly to +24v. Also replaced the existing bias components with a single 220k pot between 24v and the base of the tip31. Seems to sound a bit smoother this way.
  Reply With Quote
Old 10th April 2004, 10:54 AM   #7
johnnyx is offline johnnyx  United Kingdom
diyAudio Member
 
Join Date: Jan 2004
Location: manchester
I should think that the lamp will be a non - linear load leading to distortion. You could use valve (tube) heaters instead of a lamp; - that would really confuse everyone who saw it.
  Reply With Quote
Old 10th April 2004, 11:56 AM   #8
diyAudio Member
 
Circlotron's Avatar
 
Join Date: Jun 2002
Location: Melbourne, Australia
On your home page you say:
Quote:
I was impressed by the way decay of sounds was captured
I know *exactly* what you mean. My memory of previous sound systems was that as a sound faded away it "crumbled" and deteriorated into dirty little pieces. I have had ~18 months of class A listening now, and the difference is that those decaying sounds are =absolutely= clean and detailed as they receed away into the ambience and the distance.

You know it's real if you weren't expecting it.
  Reply With Quote
Old 14th April 2004, 05:39 PM   #9
diyAudio Member
 
Join Date: Jan 2004
Location: Virginia, USA
Quote:
Originally posted by BrianGT



Take off the period...
http://www.mthain.dsl.pipex.com/mickey.html

the link works for me


--
Brian

Gives a 404 error for me....
  Reply With Quote
Old 14th April 2004, 07:04 PM   #10
diyAudio Member
 
Join Date: Mar 2004
Location: aberdeen, uk
Send a message via AIM to martinab2 Send a message via MSN to martinab2 Send a message via Yahoo to martinab2
Yes, It's not working - sorry! My ISP is reporting a server problem which should be back online fairly soon.
  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
any basic words of wisdom? J.k.Wilson Full Range 4 2nd September 2005 10:01 PM


New To Site? Need Help?

All times are GMT. The time now is 12:29 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