637 Amplifiers - Page 10 - 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 6th September 2012, 02:49 PM   #91
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao Send a message via Skype™ to quanghao
i have some picture of driver 637 amli,
please see it!
thanks
Attached Images
File Type: jpg 6371.jpg (148.8 KB, 977 views)
File Type: jpg 637-2.jpg (142.6 KB, 883 views)
File Type: jpg 637.3.jpg (144.8 KB, 813 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 7th September 2012, 02:51 PM   #92
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao Send a message via Skype™ to quanghao
a few more pictures, many thanks!
Attached Images
File Type: jpg 33.jpg (177.8 KB, 755 views)
File Type: jpg 48.jpg (164.3 KB, 714 views)
File Type: jpg 555.jpg (186.2 KB, 279 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 12th January 2013, 09:28 PM   #93
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao Send a message via Skype™ to quanghao
hi all!

take quite some time, and I finally completed amplifier 637, with such modifications and certain combinations, to invite you to view images!
Thank you
Attached Images
File Type: jpg CS2.jpg (545.9 KB, 509 views)
File Type: jpg CS-637.1.jpg (644.6 KB, 493 views)
File Type: jpg Supply-637.4.jpg (588.5 KB, 397 views)
File Type: jpg Supply-637.9.jpg (712.1 KB, 381 views)
File Type: jpg Supply-637.10.jpg (651.4 KB, 353 views)
File Type: jpg Supply-637.11.jpg (664.0 KB, 302 views)
File Type: jpg Supply-637.7.jpg (783.8 KB, 366 views)
File Type: jpg Supply-637.5.jpg (872.1 KB, 408 views)
File Type: jpg Supply-637.3.jpg (620.5 KB, 339 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 13th January 2013, 04:53 AM   #94
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
That is really neat, but my original comments still apply. This circuit is not like the OPA637. The special thing about the OPA637 is the input stage, everything else is conventional. This amp should not be named after the opamp; that is just misleading.
  Reply With Quote
Old 13th January 2013, 05:01 AM   #95
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Blog Entries: 2
Hey, which ferrite beads do you use for your FETs? Are they on both pins except the gate? Anyway it's an extremely nice build and looks incredible. Did you get the chassis from siliconray perhaps?

From your latest schematics it looks like this amp is a tweaked Goldmund clone rather than an OPA637.
  Reply With Quote
Old 13th January 2013, 08:45 AM   #96
diyAudio Member
 
Join Date: Mar 2008
Nice work. Are the toroidal transformers in the power supply epoxy potted?

Last edited by tommy1000; 13th January 2013 at 08:48 AM.
  Reply With Quote
Old 13th January 2013, 09:17 AM   #97
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao Send a message via Skype™ to quanghao
Quote:
Originally Posted by keantoken View Post
Hey, which ferrite beads do you use for your FETs? Are they on both pins except the gate? Anyway it's an extremely nice build and looks incredible. Did you get the chassis from siliconray perhaps?

From your latest schematics it looks like this amp is a tweaked Goldmund clone rather than an OPA637.
yes, I see Gm and Anthony.E.Holton amli, all is one design.
All from topo symmetrical
Maybe I copy Too

I buy chaissic from China.

Thanks
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html

Last edited by quanghao; 13th January 2013 at 09:22 AM.
  Reply With Quote
Old 13th January 2013, 09:18 AM   #98
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Blog Entries: 2
Send a message via Yahoo to quanghao Send a message via Skype™ to quanghao
Quote:
Originally Posted by tommy1000 View Post
Nice work. Are the toroidal transformers in the power supply epoxy potted?
power transformer is because Vietnamese people, wrap,
I use two power transformers 0 - 58.5 V x 1A for one chanel.

Thanks
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
  Reply With Quote
Old 13th January 2013, 02:50 PM   #99
diyAudio Member
 
Join Date: Mar 2008
Quote:
Originally Posted by quanghao View Post
I use two power transformers 0 - 58.5 V x 1A for one chanel.
1A ?? Are you shure? You have 12 pcs of expensive power mosfets for each channel.
  Reply With Quote
Old 13th January 2013, 03:02 PM   #100
diyAudio Member
 
Join Date: Jan 2011
Location: Fosser, Aurskog-Holand, Akershus, Norway.
Quote:
Originally Posted by tommy1000 View Post
1A ?? Are you shure? You have 12 pcs of expensive power mosfets for each channel.
I would guessed 1KVA
__________________
Sooner or later you end up with TANDBERG
  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
Jackson 637 Tube tester Info needed Zero Cool Tubes / Valves 0 19th September 2008 10:46 PM
Opa627/637 for sale Audio.Spec1 Swap Meet 1 4th August 2007 11:29 AM
Fs: Bb Opa627,637 vadimgal Swap Meet 6 14th January 2007 03:27 AM
Fs: Opa627/637, Ad1862 vadimgal Swap Meet 0 9th July 2006 02:16 PM


New To Site? Need Help?

All times are GMT. The time now is 10:06 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