F5X -- the EUVL Approach - The Build Thread - Page 96 - 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 29th April 2014, 05:34 AM   #951
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
You are an experienced DIYer.
I am surprised you did not do more diagnosis before posting.

I have also described the functioning of the protection board in detail.
The protection relays all have one trip signal line and are not separate left and right.
So if one channel has a DC (fault), both channels will be turned off.

If only one channel turns off, then your relay driver for that channel is not working properly.
If I remember correctly, you put 24V on 12V relays without adding compemsating resistor.
So you should look at that.
You should also look at the gate voltage of the buzzing relay.
Maybe you have oscillation there.


The best way to find out whether the amp itself has a problem is :

1) Take the amplifier module off and use a lab supply with current limit.
2) Short the inputs and check all DC values. You should attach a 4~8ohm resistive load.
3) Use a functions generation to check output under load with an oscilloscope.
4) Repeat (3) with real speaker load.

If all OK, then the problem is not with the amplifier.

I have life and death issues to deal with at home.
So I shall not be able to nurse you through this for at least the next 2~3 months.


Patrick
__________________
xen-audio.com

Last edited by EUVL; 29th April 2014 at 05:40 AM.
  Reply With Quote
Old 29th April 2014, 11:31 AM   #952
diyAudio Member
 
Triodethom's Avatar
 
Join Date: Dec 2009
Location: Newnan GA
Quote:
Originally Posted by DrDyna View Post
Why did I suddenly get The Red Green Show in my head when I read this?

https://www.youtube.com/watch?v=MpJM4Y1ajew#t=325
Duct tape every things better with duct tape.
  Reply With Quote
Old 29th April 2014, 01:43 PM   #953
Horio is offline Horio  United States
Newbie
diyAudio Member
 
Horio's Avatar
 
Join Date: Mar 2010
Location: Seattle
Thanks Patrick.

As I thought about it more late last night, it did seem like the problem was at the muting board. I never knew a small relay could buzz so loudly. I will investigate more, and try swapping out the relay for a new one.

I'm sorry to hear about your issues at home. I wish you and your family the best of luck through this time.
  Reply With Quote
Old 29th April 2014, 03:11 PM   #954
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Since the same trigger line drives all relays, and only one (or two) relays are buzzing, it is likely a component issue and not a circuit one.


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 29th April 2014, 07:49 PM   #955
Horio is offline Horio  United States
Newbie
diyAudio Member
 
Horio's Avatar
 
Join Date: Mar 2010
Location: Seattle
When the buzzing problem started last night, I took voltage measured across the relay. I measured 24V across the diode on the relay board prior to the buzzing, and then 0V afterward so I am thinking the relay itself may be ok. On this amp, I swapped out the input relays for 24Vdc ones before I powered it up for the first time.

I am starting to think it may be an issue with the input relay driver on the protection board. I will do some more testing tonight to confirm it is not the relay itself, and see if I can better isolate the problem.
  Reply With Quote
Old 30th April 2014, 06:11 AM   #956
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Greg,

You would find it a much more rewarding experience if you would take your time and eventually figure out and cure the problem yourself.
Then it would be the right time to post your experience here.

No one else can do remote debugging for you, and more importantly, you don't need that.


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 1st May 2014, 07:48 PM   #957
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

I have life and death issues to deal with at home.
So I shall not be able to nurse you through this for at least the next 2~3 months.


Patrick
Patrick,

Sorry to hear about your issues at home. Wish you well.

Garrett
  Reply With Quote
Old 6th May 2014, 04:56 AM   #958
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Greg,

Have you located / solved your relay problem ?


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 7th May 2014, 05:52 AM   #959
Horio is offline Horio  United States
Newbie
diyAudio Member
 
Horio's Avatar
 
Join Date: Mar 2010
Location: Seattle
Patrick,

I haven't been able to replicate the issue. It happened 4 times over 2 days. I had the amp completely unplugged for a little while, and now I can't get it to happen again. I'll keep enjoying great sounding music in the mean time.

Very strange.
  Reply With Quote
Old 7th May 2014, 06:21 AM   #960
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Check poort contact somewhere along the line for that relay.
If you wish to be safe, replace the driver MOSFET for that relay also.
Check also the gate resistor.


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 862 26th August 2014 12:56 AM
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 12:54 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