Dx Blame MKIII-Hx - Builder's thread - Page 80 - 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 18th January 2012, 05:24 PM   #791
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Rudy, the voltage you are measuring across the "fuse-resistor" depends on the value of this resistor.

As I understand it, Carlos recommends a quisecent current of 100mA.

If you use a 47 Ohm, then your multimeter will read 4.7V; if you use a 100 Ohm resistor, your multimeter will read 10V.

Please check Carlos' recommendation once more.

Best regards - Rudi
  Reply With Quote
Old 18th January 2012, 06:40 PM   #792
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
I short the input signal hot to signal ground.
Everyting is good, emitter resistor I measure 1 milivolt constant.

@ Rudi, I measure over 100 ohm resistor 4,7 volt.
And I check Carlos recommendation

Regards,
Rudy
__________________
Itís not what you know, but who you know ďand where they areĒ

Last edited by BMW850; 18th January 2012 at 06:42 PM.
  Reply With Quote
Old 18th January 2012, 06:55 PM   #793
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
What is the output offset in mVdc?
What is the output noise in mVac?
__________________
regards Andrew T.
  Reply With Quote
Old 18th January 2012, 07:30 PM   #794
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
Quote:
What is the output offset in mVdc?
I short the input signal hot to signal ground, and I measure 19,20 volt DC output offset at the speaker terminals.

Quote:
What is the output noise in mVac?
Sorry you or anybody else explain to me how I measure that?
I short the input signal hot to signal ground, I measure between 1,5 and 3,2 mV AC output at the speaker terminals, it goes up and down.

Regards,
Rudy
__________________
Itís not what you know, but who you know ďand where they areĒ

Last edited by BMW850; 18th January 2012 at 07:58 PM.
  Reply With Quote
Old 18th January 2012, 08:15 PM   #795
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
I forgot to mention. I power up directly from the mains, and I have the fuse in there.

Tomorrow evening I go further, go to sleep now early day tomorrow.
I short the input signal hot to signal ground, and I measure 19,20 volt DC output offset at the speaker terminals

Let me know where are the errors

Regards,
Rudy
__________________
Itís not what you know, but who you know ďand where they areĒ

Last edited by BMW850; 18th January 2012 at 08:45 PM.
  Reply With Quote
Old 19th January 2012, 09:00 AM   #796
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by BMW850 View Post
I short the input signal hot to signal ground, and I measure 19,20 volt DC output offset at the speaker terminals..............
I short the input signal hot to signal ground, I measure between 1,5 and 3,2 mV AC output at the speaker terminals, it goes up and down
Quote:
I forgot to mention. I power up directly from the mains, and I have the fuse in there.
You are being foolhardy.
Why are you powering up direct on line?

The 19Vdc output offset shows there is a wiring error.
The variable 1.5mVac to 3.2mVac could be showing noise or oscillation or hum at the output. But you must sort the output offset first and any oscillation if it exists, before you can be sure that the mVac reading is noise.
__________________
regards Andrew T.
  Reply With Quote
Old 19th January 2012, 11:42 AM   #797
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
I have all mounted components as described on print screen, hopefully there are no errors on print screen.
All parts measured and sorted before and when I took in the components for soldering, again as first measure the resistors.

Well that I have been reckless, the output offset mVdc and the output noise in mVac I forgot to measure that yes that was stupid, all the other measures good

The GND I use as the minus for the speaker output (out the +) and the other 3 wires (+60v -60v GND) are good connected otherwise we have a lot of smoke.

I know it’s difficult to tell what’s wrong from a distance, but where shall I search the error first.

Regards,
Rudy
__________________
Itís not what you know, but who you know ďand where they areĒ

Last edited by BMW850; 19th January 2012 at 11:44 AM.
  Reply With Quote
Old 19th January 2012, 12:04 PM   #798
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
Rudy,

do all legs of all transistors that you have mounted vertically, show infinite resistance (MOhm scale on your DMM) in respect to the heatsink?

Rudi
  Reply With Quote
Old 19th January 2012, 12:08 PM   #799
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Pics of the open chassis and close ups of the detailed wiring.
__________________
regards Andrew T.
  Reply With Quote
Old 19th January 2012, 12:29 PM   #800
BMW850 is offline BMW850  Netherlands
diyAudio Member
 
BMW850's Avatar
 
Join Date: Aug 2004
Location: North East of the Netherlands
Full resolutie is to big
Attached Images
File Type: jpg 20120119_141403.jpg (422.9 KB, 183 views)
File Type: jpg 20120119_141502.jpg (404.2 KB, 169 views)
File Type: jpg 20120119_141630.jpg (352.8 KB, 152 views)
File Type: jpg 20120119_141809.jpg (412.8 KB, 135 views)
__________________
Itís not what you know, but who you know ďand where they areĒ
  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 1693 21st July 2014 12:50 AM
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 06:46 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