Salas hotrodded blue DCB1 build - Page 236 - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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 November 2012, 10:13 PM   #2351
diyAudio Member
 
dimkasta's Avatar
 
Join Date: May 2010
Location: Athens
And about 2 hours later the temperature is 45C on the plate/heatsinks and 50C on the fets. Sorry for the spam, I just want to keep these somewhere where I will not lose them...

So the next step is 2 additional heatsinks and heat-conductive paste, to drop it to around 40C on the fets.
  Reply With Quote
Old 13th November 2012, 03:51 AM   #2352
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Members like detailed step experiments, personal evaluations, and photos. No spam its your story.

P.S. 50C on the cases at 1A is no drama for 0.82C/W RthJC devices with 150C internal breakpoints, especially on Kerafol pads.
  Reply With Quote
Old 13th November 2012, 04:00 AM   #2353
syklab is online now syklab  Hong Kong
diyAudio Member
 
Join Date: Jul 2009
Location: Hong Kong
dimkasta,
Can you share some photo?
  Reply With Quote
Old 13th November 2012, 07:23 AM   #2354
diyAudio Member
 
dimkasta's Avatar
 
Join Date: May 2010
Location: Athens
Thanks Salas.
According to Mike the pads are no kerafol ones. Just some cheapish from mouser.

syklab nothing significant has changed on my build so far. Just check my previous photos. I have just soldered the extra parallel resistors, and placed 2 heatsinks 10x10x4cm rated at 0,6C/W right on top of the plate. No thermal paste or screws yet.

I will try to post a photo later today.

PS for me, a reminder to get bigger rating resistors. These are getting hot.
  Reply With Quote
Old 13th November 2012, 07:32 AM   #2355
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
With normal Silpads its 1C/W additionally. With 1A you burn 10W in each Mosfet now. So at 50C case temp you should have +10C +8.2C in the core. I.e. 68.2C. IRF240s yawn at that.
  Reply With Quote
Old 13th November 2012, 12:37 PM   #2356
diyAudio Member
 
dimkasta's Avatar
 
Join Date: May 2010
Location: Athens
Nice

By the way, I have some of the DIY store PSU boards and I am thinking of using one to move the transformer out of the chassis.
http://www.diyaudio.com/forums/image...-schematic.pdf

I have used 0,47R for R1-R8, FEP30DP for the rectifiers and 4 22kuF caps per rail (basically prepared it for F5 which is now postponed for a bit).

Would this be suitable? Or will it have any negative affect on the performance if we take into consideration that we are trying to get as much as we can by pushing the circuit's CSS current?
  Reply With Quote
Old 13th November 2012, 12:50 PM   #2357
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
It looks very nice actually. The very low value RC helps with the heavy charge cycle's EMI too. I don't know how you will perceive so much capacitance subjectively but its a board I would surely try given it being handy.
  Reply With Quote
Old 13th November 2012, 01:05 PM   #2358
diyAudio Member
 
dimkasta's Avatar
 
Join Date: May 2010
Location: Athens
I have some non-populated pcbs too. Unfortunately I have no diodes left and no 4700uF caps of decent quality. You think the huge capacitance could be an issue?
  Reply With Quote
Old 13th November 2012, 01:14 PM   #2359
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
To be unnecessarily hard to a given transfo maybe, in general its about going the royal way and testing the subjective impact. Only you can tell bcs its what caps type also.
  Reply With Quote
Old 13th November 2012, 01:25 PM   #2360
weskoki is offline weskoki  Europe
diyAudio Member
 
weskoki's Avatar
 
Join Date: Aug 2009
Dimkasta,could you let me know the size of your aluminum plate and how thick is it?
  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
dcb1 buffer with shunt reg. merlin2069er Swap Meet 0 3rd August 2010 05:25 PM
F2 and DCB1 parts selection - please advice! DQ Pass Labs 6 25th November 2009 03:20 PM
Y B Blue - how blue LED improves the CD playback Peter Daniel Digital Source 176 25th September 2003 07:40 AM


New To Site? Need Help?

All times are GMT. The time now is 05:21 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