Dx Blame MKIII-Hx - Builder's thread - Page 174 - 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 12th July 2013, 11:34 PM   #1731
diyAudio Member
 
Join Date: Jul 2011
Look at my DX MKIII.
48012_626667174012371_347453836_n (1) - Download - 4shared - Newton Costa

1002295_626667637345658_992110443_n (1) - Download - 4shared - Newton Costa

><>Newton J. Costa<><
  Reply With Quote
Old 13th July 2013, 02:18 PM   #1732
diyAudio Member
 
Join Date: Nov 2012
It looks nice Newton. Do you have a chassis planned for it?
  Reply With Quote
Old 13th July 2013, 02:28 PM   #1733
diyAudio Member
 
meanman1964's Avatar
 
Join Date: Oct 2006
Location: Belgium the land of chocolate
radioFlash,can you send me a pdf file of your layout?
  Reply With Quote
Old 13th July 2013, 04:03 PM   #1734
diyAudio Member
 
Join Date: Nov 2012
meanman1964,

I've been working on populating the board. I noticed I had a missing track for R08A to R08B. I also increase the hole sizes for some of the electrolytics. Attached is a PDF with some of these corrections.
Attached Images
File Type: jpg radioFlash DXMKIII PCB partially populated.jpg (161.3 KB, 214 views)
Attached Files
File Type: pdf DX Blame MKIII HX output 2013-07-13-a.pdf (597.6 KB, 92 views)
  Reply With Quote
Old 13th July 2013, 04:23 PM   #1735
diyAudio Member
 
vargasmongo3435's Avatar
 
Join Date: May 2011
Location: Quebradillas, Puerto Rico
Send a message via Yahoo to vargasmongo3435
mister radio flash that is what I call, "talent" a really well put it together a truly DIY concept art, thumps up sir

Regards
Juan
  Reply With Quote
Old 13th July 2013, 04:37 PM   #1736
wiljj78 is offline wiljj78  Philippines
diyAudio Member
 
wiljj78's Avatar
 
Join Date: Mar 2012
Location: Bahrain
Quote:
Originally Posted by vargasmongo3435 View Post
mister radio flash that is what I call, "talent" a really well put it together a truly DIY concept art, thumps up sir

Regards
Juan
Yess very nice indeed... But i'm thinking on Q12 and Q10 Heatsink are enough to handle the heat if R13 used 22R??
Regards,
  Reply With Quote
Old 13th July 2013, 07:59 PM   #1737
diyAudio Member
 
Join Date: Jul 2011
Quote:
Originally Posted by radioFlash View Post
It looks nice Newton. Do you have a chassis planned for it?
radioFlash not yet, but I'm thinking of a model.


><>Newton J. Costa<><
  Reply With Quote
Old 13th July 2013, 08:09 PM   #1738
diyAudio Member
 
Join Date: Jul 2011
Can see other photos here.
Flickr: Newton J. Costa's Photostream

><>Newton J. Costa<><
  Reply With Quote
Old 13th July 2013, 08:54 PM   #1739
diyAudio Member
 
Join Date: Nov 2012
Thanks for your kind comments vargasmongo. As for the the heatsinks on Q12 and Q10, they're rated at about 7C/W. I'm not sure what the power dissipation of Q12 and Q10 are, so I'm not sure if that's sufficient.
  Reply With Quote
Old 15th July 2013, 02:11 AM   #1740
diyAudio Member
 
Join Date: Nov 2012
I finished installing all the components on the board using my layout and turned on the amp using the lightbulb tester and no load connected and a +/- 40V power supply. The lightbulb flashed as the caps charged and then went out, but I see +35V on the output without any input signal. The oscillocope shows DC. The good news is it provides another "learning opportunity" for me!

So far, I've done the following in-circuit checks with the amp powered off:
* Set VR midway
* No short to heatsink for output transistors
* Inspected soldering and did continuity check--did not find any shorted tracks
* Verified correct transistors installed in correct locations
* Diode check Q12 ok (b to c, e)
* Diodes 1n4007, BAV21 ok on diode check
* Checked all transistors, no shorts
* Did not note any unusually hot components or observe any obvious physical damange such as scorched/smoking resistors or capacitors
* Checked resistor value R10-correct 2k2
* Checked orientation of electrolytics-ok
* Checked continuity of rails to OP transistors: only saw continuity with collectors as expected
Attached Images
File Type: jpg RIT_3977.jpg (173.3 KB, 167 views)
File Type: jpg RIT_3983.jpg (201.4 KB, 167 views)
File Type: jpg RIT_3992.jpg (200.1 KB, 156 views)
  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
Dx Blame ST - Builder's thread - post pictures, reviews and comments here please. destroyer X Solid State 1686 14th June 2014 01:10 PM
Dx Blame MKIII Supercharged will soon be released destroyer X Solid State 346 22nd April 2014 03:01 PM
group buy for DX Blame MKIII Hx PCBs ByronInPortland Group Buys 247 5th December 2012 12:05 AM
Group By: DX Blame MKIII Hx boards ByronInPortland Group Buys 9 19th July 2011 07:21 AM
Dx Blame MKII, an obvious evolution from the Dx Blame ES/ST destroyer X Solid State 4 25th September 2010 06:41 PM


New To Site? Need Help?

All times are GMT. The time now is 05:28 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