X-Calibre : Hot Rodding Mauro Penasa's LM3886 design - Page 5 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 7th December 2005, 05:31 AM   #41
diyAudio Member
 
Join Date: Apr 2002
Default The AD815 is a killer

I built this pre sometime ago using CFM's layout. The AD815 is a marvelous pre, easily outperforming the 627/634 combo's. Try it!
  Reply With Quote
Old 7th December 2005, 06:09 AM   #42
diyAudio Member
 
Join Date: Jul 2004
Location: .
Ryan, do you have a spare chip? i would like to try it with the X-calibre.
  Reply With Quote
Old 7th December 2005, 07:55 AM   #43
lazyfly is offline lazyfly  Australia
diyAudio Member
 
Join Date: Jun 2004
Location: Melbourne
Hi Rudi,

If memory serves you were having a clipping issue that was rearing its ugly head with your original rev c. I'm just wondering if that issue has been resolved or you know why it was (is?) happening?
  Reply With Quote
Old 7th December 2005, 08:24 AM   #44
diyAudio Member
 
Join Date: Jul 2004
Location: .
Hi Lazyfly.

you will always have those issues with this particular design but it is only when you play very load.

I am checking a few things , but i think that I might have over bias the Lm318 and that is causing the clipping , just a thought. will check it during this week (not that i will remove it if it is a problem, because it makes the amp focus much better)

this is like a race car. to get the max out of it you will have to sacrifice something else
  Reply With Quote
Old 7th December 2005, 10:06 AM   #45
Mick_F is offline Mick_F  Germany
diyAudio Member
 
Join Date: Jun 2005
Location: Cologne
I'd just like to mention that the Alps RK09 series are very good pots for a very low price. The are sold as 10k and 50k.

Mick
__________________
No statement here.
  Reply With Quote
Old 7th December 2005, 10:12 AM   #46
diyAudio Member
 
Join Date: Jul 2004
Location: .
here is my current implementation

2 x 550va C-core transformers 28-0-28
8 x 10000uf 40 Sprague caps
16 MUR 860 diodes
rubycon yxf
Wima MKP4 630v input
Attached Images
File Type: jpg case-front.jpg (96.0 KB, 1317 views)
  Reply With Quote
Old 7th December 2005, 10:14 AM   #47
diyAudio Member
 
Join Date: Jul 2004
Location: .
top
Attached Images
File Type: jpg case-top.jpg (99.0 KB, 1233 views)
  Reply With Quote
Old 7th December 2005, 10:14 AM   #48
Mick_F is offline Mick_F  Germany
diyAudio Member
 
Join Date: Jun 2005
Location: Cologne
Well.... that looks good!
__________________
No statement here.
  Reply With Quote
Old 7th December 2005, 10:15 AM   #49
diyAudio Member
 
Join Date: Jul 2004
Location: .
back
Attached Images
File Type: jpg case-back.jpg (97.8 KB, 1199 views)
  Reply With Quote
Old 7th December 2005, 10:15 AM   #50
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
Quote:
Originally posted by rudi
you will always have those issues with this particular design but it is only when you play very load.
There must be some issue on this particular design.
I have 86~87db speakers and a total gain of ~60x (21x power amp + 2.87x pre) and I can't get it to audibly clip, as much loud as I listen to. Maybe I would be deaf before that.
  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
my_ref revC group buy (Mauro Penasa LM3886 design) schro20 Group Buys 650 17th October 2010 11:42 PM
WTB: Mauro Penasa Ref C marginwalker Swap Meet 0 13th October 2007 05:28 PM
My Version of Mauro Penasa's LM3886 Stanley Drake Chip Amps 28 31st December 2006 12:41 AM
Mauro Penasa's INV GC/REF GC group buy. Russ White Group Buys 277 27th March 2006 08:57 AM


New To Site? Need Help?

All times are GMT. The time now is 07:04 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