Hypex Ncore - Page 362 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

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
Closed Thread
 
Thread Tools Search this Thread
Old 11th April 2012, 03:42 PM   #3611
diyAudio Member
 
Join Date: Mar 2007
Hypex told me they do not adjust the shut down for the input an the fault must be there. I was promised I could send the PCB;s back for adjustment but I think we will leave them as they are.
 
Old 11th April 2012, 04:42 PM   #3612
diyAudio Member
 
Join Date: May 2009
You could run them at higher voltage as you are doing now, isn't it? This will give you a bit more power which you probably are missing now.
 
Old 11th April 2012, 04:42 PM   #3613
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by Erlend Sæterdal View Post
Hypex told me they do not adjust the shut down for the input an the fault must be there. I was promised I could send the PCB;s back for adjustment but I think we will leave them as they are.
Well, as the input stage only draws 40 mA, it would be really easy to use a couple of zener diodes to stabilize that voltage - allowing you to go back to full power on the main supply.
 
Old 11th April 2012, 04:44 PM   #3614
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by Mark.Clappers View Post
Did you have a look with a microscoop? I use a stereo scoop with 10X magnification, with this I am able to see the tiny solder briges that are sometimes left behind when removing smd components, with the naked eye these are very hard to spot.
No, didn't use a microscope, but a 8x magnifying glass - pretty sure there are no solder bridges.
 
Old 11th April 2012, 04:45 PM   #3615
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by Mark.Clappers View Post
I use a 2mm flat tip with a blob of solder. Works like a charm!
That's how I do it too.
 
Old 11th April 2012, 05:34 PM   #3616
diyAudio Member
 
Join Date: Mar 2007
Quote:
Originally Posted by Mark Verhoeven View Post
You could run them at higher voltage as you are doing now, isn't it? This will give you a bit more power which you probably are missing now.
Yes a bit, no big difference tough ! 20 w or something near that.
 
Old 11th April 2012, 05:36 PM   #3617
diyAudio Member
 
Mark.Clappers's Avatar
 
Join Date: Jan 2010
Location: The Netherlands, near the German border
Quote:
Originally Posted by Julf View Post
No, didn't use a microscope, but a 8x magnifying glass - pretty sure there are no solder bridges.
Then the only thing I can think of is the "reflow" methode (with a hot air desoldering gun and some flux)..
__________________
Music is art - Audio is psychoacoustics & engineering
 
Old 11th April 2012, 05:37 PM   #3618
diyAudio Member
 
Join Date: Mar 2007
Quote:
Originally Posted by Julf View Post
Well, as the input stage only draws 40 mA, it would be really easy to use a couple of zener diodes to stabilize that voltage - allowing you to go back to full power on the main supply.
Zener diodes are noisy !
 
Old 11th April 2012, 07:05 PM   #3619
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Quote:
Originally Posted by Erlend Sæterdal View Post
Zener diodes are noisy !
Something a filter capacitor can't fix?
 
Old 11th April 2012, 08:04 PM   #3620
diyAudio Member
 
Join Date: Jan 2007
Quote:
Originally Posted by Julf View Post
Something a filter capacitor can't fix?
I don't get what's happening (= I forgot ), is the danger that he would exceed the voltage limits for his input stage, so he has dropped his rail voltage to provide it directly? Zeners with a cap bypass would surely work, but I understand Erlend wanting to find the cleanest possible source. He could use a IC regulator or precision voltage source...if there were room for that...But if the voltage simply feeds regulators like the HxRs, which have an incredibly high PSRR, your zener/cap suggestion would be as clean as anybody could want.

Also wondering about your resistor woes...obviously you measured for shorts and opens both within and near the resistor afterwards. I've had stray fibers of copper do a job on a circuit, then disappear with a good shake or compressed air. Do you think a semiconductor was blown from the incident? When I see a total collapse with no visible damage, that's what I suspect next.
 

Closed Thread


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
Hypex Ncore vs. NAKSA AlliumPorrum Class D 1 26th May 2015 07:36 PM
Problem with Hypex Ncore Koifarm Class D 29 13th October 2014 07:32 AM
Any news on hypex ncore 2.0? JZatopa Class D 1 13th August 2013 11:30 AM
Hypex UcD700 vs NCore Earbound Class D 25 15th March 2013 05:10 PM
Building a Hypex Ncore... Jabbejokker Class D 0 7th March 2013 10:08 PM


New To Site? Need Help?

All times are GMT. The time now is 07:16 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright ©1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki