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

Solid State Talk all about solid state amplification.

FET amplifier
FET amplifier
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 29th August 2004, 04:09 PM   #1
russel_h is offline russel_h  Europe
diyAudio Member
 
Join Date: Aug 2004
Location: Hampshire (the original one)
Default FET amplifier

Originally posted this in analogue by mistake, mods feel free to delete if you wish.


This is an amplifier I designed several years ago, its unusual in that it has an error correcting output stage based on Hawksfords topology. The PSU used T-Network capacitors from DNM see:
http://www.dnm.co.uk/capacitors.html#tnetwork
It is not really a project for the beginner, but if you persevere it does sound nice, a friend compared it to his Chord SPM1200 and thought it did not go as loud but that was is only criticism. Have fun!
Attached Files
File Type: zip amp.zip (36.8 KB, 351 views)
__________________
Russ
  Reply With Quote
Old 29th August 2004, 05:05 PM   #2
russel_h is offline russel_h  Europe
diyAudio Member
 
Join Date: Aug 2004
Location: Hampshire (the original one)
try attaching zip file yet again
Attached Files
File Type: zip amp.zip (36.8 KB, 250 views)
__________________
Russ
  Reply With Quote
Old 29th August 2004, 06:19 PM   #3
russel_h is offline russel_h  Europe
diyAudio Member
 
Join Date: Aug 2004
Location: Hampshire (the original one)
Default amp picture

picture of inside of the amplifier
Attached Images
File Type: jpg amp_top.jpg (86.3 KB, 559 views)
__________________
Russ
  Reply With Quote
Old 29th August 2004, 06:21 PM   #4
russel_h is offline russel_h  Europe
diyAudio Member
 
Join Date: Aug 2004
Location: Hampshire (the original one)
Default amplifier picture

side picture of amplifier
Attached Images
File Type: jpg amp_side.jpg (82.0 KB, 405 views)
__________________
Russ
  Reply With Quote
Old 29th August 2004, 08:05 PM   #5
russel_h is offline russel_h  Europe
diyAudio Member
 
Join Date: Aug 2004
Location: Hampshire (the original one)
amp schematic in bitmap form. Original files are ISIS/ARES
Attached Files
File Type: zip amp_sch.zip (67.1 KB, 305 views)
__________________
Russ
  Reply With Quote
Old 29th August 2004, 08:07 PM   #6
russel_h is offline russel_h  Europe
diyAudio Member
 
Join Date: Aug 2004
Location: Hampshire (the original one)
PSU schematic original files are ISIS/ARES readers are available from www.labcenter.co.uk
Attached Files
File Type: zip psu_sch.zip (67.1 KB, 128 views)
__________________
Russ
  Reply With Quote
Old 29th August 2004, 08:36 PM   #7
Upupa Epops is offline Upupa Epops  Czech Republic
diyAudio Member
 
Join Date: Aug 2003
Location: Prague,Czech Republic
No answers here - you must say, how it sounded in comparision with GC, not with CHORD - I know imagine it, 'cos I'm using error correction too, but mostly of guys here not .
  Reply With Quote
Old 30th August 2004, 09:12 AM   #8
russel_h is offline russel_h  Europe
diyAudio Member
 
Join Date: Aug 2004
Location: Hampshire (the original one)
IME chip amps sound OK for most purposes, but lack that finesse, bass slam and three dimensional imaging you get with a good discrete design. Basically I have not heard an amplifier costing less than 3000UKP sounding anywhere near as good as this design. Someone has reviewed in another forum, I will ask permission to post it here.

Russ
__________________
Russ
  Reply With Quote
Old 30th August 2004, 03:34 PM   #9
russel_h is offline russel_h  Europe
diyAudio Member
 
Join Date: Aug 2004
Location: Hampshire (the original one)
Default Error

Apologies there is an error in the original schematic, if anyone was wondering why the junction of C5 and D1 one did not go anywhere it goes to the junction of R15 R13 and Q9. The PCB is correct. Moral of story do not try and do any work with small children in the vicinity.
Attached Files
File Type: zip ecamp.zip (79.8 KB, 157 views)
__________________
Russ
  Reply With Quote
Old 30th August 2004, 03:39 PM   #10
Upupa Epops is offline Upupa Epops  Czech Republic
diyAudio Member
 
Join Date: Aug 2003
Location: Prague,Czech Republic
Russ, I'm last one, who need explanation about sound of this type amp , I say again, I like error correction ( my design is little bit more complicated, but in principle similar ). I'm using too dual monaural conception, but my devices inside are little bit less sloshed - it was joke . But remember, that most of guys here like much more simply design and when are talking about discrete design, they stoped thinking by six transistor quasicomplement .
  Reply With Quote

Reply


FET amplifierHide 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
Wanted: DIY amplifier builder with experience. I need a 0.7 ohm stable amplifier Audiophilenoob Swap Meet 34 16th May 2005 11:58 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier. novtango Pass Labs 2 21st October 2002 01:50 AM


New To Site? Need Help?

All times are GMT. The time now is 12:37 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki