Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Amp Camp Amp - ACA
Amp Camp Amp - ACA
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 31st July 2017, 01:39 PM   #3371
ernesternest is offline ernesternest  Europe
diyAudio Member
 
ernesternest's Avatar
 
Join Date: Oct 2007
Location: Cologne
Good information Pico. Thank you.

So there is a reason for better 24 V sound vs 19 V.

Have you changed only the lower FET?

Best regards

Ernst
  Reply With Quote
Old 31st July 2017, 07:35 PM   #3372
2 picoDumbs is offline 2 picoDumbs  Australia
diyAudio Member
 
2 picoDumbs's Avatar
 
Join Date: Sep 2013
Top and bottom of one channel.
I'll go ahead and purchase some 24V supplies, and hopefully they turn out to be as good as the Asus supply.
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
  Reply With Quote
Old 1st August 2017, 08:49 PM   #3373
Skip Pack is offline Skip Pack  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Northern California
I got a 24 VDC Meanwell supply rated at 14.5 amps for powereing 4 ACA cards that I've used with two cards for several months now and it works very well. I put the supply in a separate box and am using Powercons for the umbilical.

I haven't heard and\ ACA with a good linear supply, but that Meanwell powering the ACA cards is clearly the best amp I've had in my system. I've several more months of work to get to my finished amps and will do a full report when done.

Skip

Last edited by Skip Pack; 1st August 2017 at 09:06 PM.
  Reply With Quote
Old 1st August 2017, 10:12 PM   #3374
2 picoDumbs is offline 2 picoDumbs  Australia
diyAudio Member
 
2 picoDumbs's Avatar
 
Join Date: Sep 2013
Quote:
Originally Posted by Skip Pack View Post
I haven't heard and\ ACA with a good linear supply, but that Meanwell powering the ACA cards is clearly the best amp I've had in my system. I've several more months of work to get to my finished amps and will do a full report when done.

Skip
No arguement.
Most musically enjoyable amp I've heard, comes closest to sounding like real musical instruments.
The only caveat is you need appropriate speakers.
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass

Last edited by 2 picoDumbs; 1st August 2017 at 10:15 PM.
  Reply With Quote
Old 2nd August 2017, 02:05 AM   #3375
2 picoDumbs is offline 2 picoDumbs  Australia
diyAudio Member
 
2 picoDumbs's Avatar
 
Join Date: Sep 2013
Found this laying around.

Click the image to open in full size.
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
  Reply With Quote
Old 2nd August 2017, 03:49 AM   #3376
2 picoDumbs is offline 2 picoDumbs  Australia
diyAudio Member
 
2 picoDumbs's Avatar
 
Join Date: Sep 2013
Default Exactly 24V + Papa Mod

I pulled out a decent lab supply and set it at 24V

THD is roughly the same but higher order harmonics have been reduced compared with 19V supply as previously observed with the 26.6V supply.

Vds across Q1 was set at 12.5 V

Bias is around 1.35A with Papa mod.

Click the image to open in full size.
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
  Reply With Quote
Old 2nd August 2017, 03:59 AM   #3377
2 picoDumbs is offline 2 picoDumbs  Australia
diyAudio Member
 
2 picoDumbs's Avatar
 
Join Date: Sep 2013
Default 24V without Papa Mod.

Without the Papa Mod it looks like this.

Click the image to open in full size.
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
  Reply With Quote
Old 2nd August 2017, 04:02 AM   #3378
2 picoDumbs is offline 2 picoDumbs  Australia
diyAudio Member
 
2 picoDumbs's Avatar
 
Join Date: Sep 2013
I'll probably settle on a Bias current around 1.15A, and see what temperature the heatsinks get to.
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
  Reply With Quote
Old 2nd August 2017, 04:44 AM   #3379
2 picoDumbs is offline 2 picoDumbs  Australia
diyAudio Member
 
2 picoDumbs's Avatar
 
Join Date: Sep 2013
Both results above are with using IXTH64N10L2.
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
  Reply With Quote
Old 4th August 2017, 09:42 AM   #3380
2 picoDumbs is offline 2 picoDumbs  Australia
diyAudio Member
 
2 picoDumbs's Avatar
 
Join Date: Sep 2013
Default Distortion Plot 24V Supply, 1.35A Bias Current

Just a little more data.
Attached Images
File Type: png ACA distortion.png (43.3 KB, 279 views)
__________________
"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
  Reply With Quote

Reply


Amp Camp Amp - ACAHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Amp Camp Amp #1 Nelson Pass diyAudio.com Articles 52 1st December 2017 06:46 AM
Amp Camp! Jason Site Announcements 2 30th June 2012 03:57 PM
Best D camp config for Tweeter amp Zero One Class D 0 24th February 2010 05:57 AM
better the Pass camp? rick57 Tubes / Valves 6 26th March 2005 07:04 AM


New To Site? Need Help?

All times are GMT. The time now is 01:43 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki