F5X -- the EUVL Approach - The Build Thread - Page 19 - 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 17th November 2012, 10:01 PM   #181
NicMac is offline NicMac  Italy
diyAudio Member
 
NicMac's Avatar
 
Join Date: Feb 2009
Where/how is the BAW76 mounted on the Mute PCB?
  Reply With Quote
Old 18th November 2012, 05:28 AM   #182
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Yes, R9 should be 47R gate stopper.
R4 should be 390R for current limiting circuit.

The BAW76 is a clamping diode across the relay coil.
The cathode is connected to positive side of the relay, anode to negative.
When the relay is switched off its inductance creates a reversed voltage spike which is clamped to 0.6V by the diode.

Dave will update when he has a few minutes to breath.


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 26th November 2012, 02:11 AM   #183
Horio is offline Horio  United States
Newbie
diyAudio Member
 
Horio's Avatar
 
Join Date: Mar 2010
Location: Seattle
I was doing a little work on the F5X over the weekend, and I noticed the VE Filter boards not quite align with the teflon support brackets. I soldered up one of the VE filters and noticed that the holes for the terminal blocks pins do not align very well. This prevents the board from sitting flush on the teflon block. Not a major issue, as it can be fixed with a small spacer.

Anyone else run into this issue?
  Reply With Quote
Old 26th November 2012, 02:59 AM   #184
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
This is not a problem I am aware of, and it can be to do with the Gerber files.
Can you give me more detail -- photos, location of mismatch, amount of mismatch, etc. ?

We shall then either suggest a work-around to you, or bear the cost of new capacitor brackets.


Sorry for the inconvenience,
Patrick
__________________
xen-audio.com
  Reply With Quote
Old 26th November 2012, 04:24 AM   #185
Horio is offline Horio  United States
Newbie
diyAudio Member
 
Horio's Avatar
 
Join Date: Mar 2010
Location: Seattle
It looks like the holes for the pins of the terminal blocks are a bit too far apart. Measuring the +VE Filter board, the distance between the center of pin #1 of J10 and pin #4 of J11 is 25mm. Measuring the distance between center of holes in teflon block, I am getting 28mm. So it appears that each group of holes in the teflon blocks are 1.5mm too far out from center.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 26th November 2012, 04:29 AM   #186
Horio is offline Horio  United States
Newbie
diyAudio Member
 
Horio's Avatar
 
Join Date: Mar 2010
Location: Seattle
The easiest solution might be a 3mm tall spacer at each one of the 3 mounting holes, and slightly longer mounting screws. Seems like that would be less costly and time consuming than fabricating new brackets. The mounting holes are properly aligned.

Last edited by Horio; 26th November 2012 at 04:31 AM.
  Reply With Quote
Old 26th November 2012, 08:26 AM   #187
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Could be misreading 28 as 25 in the layout.
But too long now for me to remember where it came from.
Anyway, mistake is mistake. No excuses.

Do you have a countersinking tool ?
If so, try countersinking each hole of the Delrin block by 1.5mm deep.
The countersink will overlap but that does not matter at all. It is just for clearance.
That should allow the PCB to seat properly even after soldering.

Please give it a try.
If you ruin your block and it does not work we'll replace it at our cost.

The other solution is new cap boards.
Our mistake, so we'll fix it one way or another.
But countersinking is a easy and practical solution. So please try that first.


Our apologies,
Patrick
__________________
xen-audio.com
  Reply With Quote
Old 26th November 2012, 08:41 AM   #188
JBdV is offline JBdV  Netherlands
diyAudio Member
 
Join Date: Mar 2009
I have the same issue, my PCB's are already soldered
  Reply With Quote
Old 26th November 2012, 08:49 AM   #189
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Those in Europe can send the Delrin blocks to me and I shall mill long slot for you to fix the offset.
Will take a while though, as I want to do them all in one go.

If you feel confident try the countersink trick. It should work fine.
Give Horio a day or two to show his trial results.


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 26th November 2012, 08:52 AM   #190
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
I just checked my drawing records and can confirm it is a PCB layout error.
It was meant to be 28mm, so the machining was correct.
My own hand-etched PCBs also have 28mm.


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 08:47 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