F5X -- the EUVL Approach - The Build Thread - Page 69 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 13th August 2013, 03:20 PM   #681
Horio is offline Horio  United States
Newbie
diyAudio Member
 
Horio's Avatar
 
Join Date: Mar 2010
Location: Seattle
pmchoong,

I did the board repair since I was part of the first batch (same as yourself). I posted a couple of photos of the finished product here.

Regarding the replacement resistor values, I exchanged a few posts with EUVL here. The repair works great, and I the DC detection/protection works as expected.
  Reply With Quote
Old 14th August 2013, 07:50 AM   #682
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Horio,
both links take me to post651 !
Where should each link go to?
__________________
regards Andrew T.
  Reply With Quote
Old 15th August 2013, 03:23 PM   #683
Horio is offline Horio  United States
Newbie
diyAudio Member
 
Horio's Avatar
 
Join Date: Mar 2010
Location: Seattle
Really? I just clicked on them both, and they went to different locations. First link should go to post #613 showing photos of my populated and fixed protection boards. Second link should go to post #601 talking about the revised SMD resistor values.
  Reply With Quote
Old 15th August 2013, 03:27 PM   #684
bkdog is offline bkdog  Australia
diyAudio Member
 
Join Date: May 2005
Location: in a house
Quote:
Originally Posted by Horio View Post
Really? I just clicked on them both, and they went to different locations. First link should go to post #613 showing photos of my populated and fixed protection boards. Second link should go to post #601 talking about the revised SMD resistor values.
Works as advertised for me. Many thanks for the update and info Horio.
  Reply With Quote
Old 15th August 2013, 03:45 PM   #685
pchw is offline pchw  United States
diyAudio Member
 
Join Date: Apr 2006
Location: Fremont, California
This symptom has something to do with the preference of number of posts per page. The link uses the page number based on Greg's preference. The software doesn't always convert to the correct page with the reader's preference.
__________________
- Fred -
  Reply With Quote
Old 17th September 2013, 01:38 AM   #686
alazira is offline alazira  United States
diyAudio Member
 
alazira's Avatar
 
Join Date: Jun 2007
Location: Las Vegas
Blog Entries: 1
Hi,
Regarding the regulator, are 1/10W resistors ok at R1/R3?
Attached Images
File Type: jpg F5X regulator question.jpg (54.2 KB, 292 views)
  Reply With Quote
Old 17th September 2013, 08:29 AM   #687
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Ala,
what current flows through each of those resistors?
Then determine the dissipation.
Compare that dissipation to Pmax. Aim for <<50%, preferably <10%
__________________
regards Andrew T.
  Reply With Quote
Old 17th September 2013, 10:21 AM   #688
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Say at start up C2 is empty (0V).
R1 sees full rail voltage (say 22V when not loaded)
In the second or so when C2 (and later C3) gets charged, R1 sees :

22*22/1k = 484mW.

Yes, only for a second or so.
But why take any risk ?


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 17th September 2013, 07:02 PM   #689
alazira is offline alazira  United States
diyAudio Member
 
alazira's Avatar
 
Join Date: Jun 2007
Location: Las Vegas
Blog Entries: 1
Quote:
Originally Posted by EUVL View Post
Say at start up C2 is empty (0V).
R1 sees full rail voltage (say 22V when not loaded)
In the second or so when C2 (and later C3) gets charged, R1 sees :

22*22/1k = 484mW.

Yes, only for a second or so.
But why take any risk ?


Patrick
Thanks Patrick,
I have some PRP 0.1% 10ppm, but then I find that they are 1/10W, not the usual 1/4W ones. In any case, looking at your calculation, perhaps I will use 1/2W ones, even if only for psychological comfort
  Reply With Quote
Old 18th September 2013, 04:28 AM   #690
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
It is not in the signal path, so just use any decent 2x7mm metal film.
Vishay Dale CMF55 or Vishay Beyschlag MBB0207 1%, e.g., are rated at 0.4W.
I think the PRP 0.5W may be too large to fit PCB.


Patrick
__________________
xen-audio.com
  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
F5X -- the EUVL Approach EUVL Pass Labs 856 10th June 2014 10:26 PM
Potential EUVL F5X designed case user distribution check pchw Group Buys 1004 27th February 2013 03:32 PM
GB 2SK3497/2SJ618 for EUVL F5X or other projects pchw Group Buys 266 8th April 2012 06:05 PM
[B]PRP resistor group buy for the EUVL F5X build[/B] NicMac Group Buys 70 4th February 2012 04:20 PM
New Saburo Build thread Wha' DIYa know? Full Range 94 17th October 2010 04:49 PM


New To Site? Need Help?

All times are GMT. The time now is 04:23 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