My "audiophile" LM3886 approach - 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 10th May 2005, 02:39 PM   #41
diyAudio Member
 
Join Date: May 2005
Location: TN
Thanks for the encouragement, Jan.
I build amplifiers ( solid state ) from about 15 years, to analytical purpose,
and am past in the CHIPSAMP because give an enormous border of configuration without the usual problems of static polarizations etc.... My purpose is dismount the esoteric beliefs on the amplifications, and shows that it may get a high-end amplifier to low cost and with component communes. Unfortunately my studies have confirmed the theories of launch planners( as Pass, Hiraga etc...) what with any technology is more "easy" have good results that with other. the preceding works have given me any confirmations of the good road,
but the prototype to which am working is the confirmation after all ( am successful "cloned" the sound of HI_END class A to using practically the same modified MY_ampli circuit ).
Without offence for any, this results are not the aftermath of a politics of well studied marketing as in the case of the " GAIN-CARD " or"CONCENTRA", what have an ridiculous industrial cost and a time of development of some hour ( the serial-parallel power exists from always ), but of a coherent analysis of the problem list and of years of comparative finalization ( sitting of listening ). In this days have an amplifier in I sojourn that costs less of 100 Euro, consumes little watt and replaces my references in class A, then have won my battle.
The sharing of this results, in my mind, is a have to "scientific", but have always a lot of in the act doubts to be in the proper forum. In 2 lines put to disposition of all ideas and results that have developed in years of work,in a forum assembled on the operation of a Feedback net or on the application of a datasheet.
Probably I will limit me to help desultorily my beginners friends with demonstrative "KIT" (as INV_GC variant) or in the ameliorations of the "Stasis" nets on them application.

Ciao

Mauro
  Reply With Quote
Old 10th May 2005, 05:48 PM   #42
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Mauro,

I am relatively new here, but this is the most refreshing and educational material I have ever read on this board. Would you mind emailing me, as I have some questions for you directly.

Thanks,
Russ
  Reply With Quote
Old 10th May 2005, 06:12 PM   #43
diyAudio Member
 
Join Date: Apr 2003
Location: Seattle
This is refreshing, even though I have absolutely no idea what's going on But in all seriousness, it's nice to see a new design from someone who obviously has a strong technical background.
  Reply With Quote
Old 15th May 2005, 09:53 AM   #44
diyAudio Member
 
Join Date: May 2005
Location: TN
END OF WORK.

Goodbye

Mauro
  Reply With Quote
Old 21st May 2005, 03:31 PM   #45
diyAudio Member
 
Join Date: May 2005
Location: TN
have decided to share my last changes for in comparison with the thousands of members that have visited this thread. For various matters I have had to change my code of access to the forum, I don't know because but doesn't interest me.
The changes to my original circuit is practically only to the Output bridge ( have increased the Zout to values that knows how to calculate from this thread ), and in this way the factor dumping depends totally from the gain margin of U1.
The principal characteristic of this modified circuit is that in output gets the imprint of the U1 THD (and amount Trans. Funtion), for which even her sound, and if want be able replace U1 with any topology, to pact to maintain balanced the net of the bridge.
If you enters on R7 (inverting mode) even is able insert a series capacitor to the signal, because the static polarization of LM3886 staies stable.
Other characteristic to go out with circuits to tall impedance is ( besides the simile with the valvular systems ), the ability to manage to the best the MFB of the loudspeakers.
The motive studies it you by himself! If have studied the circuit even discovers that is exploits the invertent characteristic of U1 that of IC1. This circuit it may even builds in non- inverting , but if go to see the discussions on solid state forum understand because I have done this choice.
I hope that anyone has followed my complete exchanges in this forum understands when costs me take back my post

Mauro Penasa
Attached Files
File Type: pdf my_ref.pdf (21.0 KB, 3631 views)
  Reply With Quote
Old 21st May 2005, 04:19 PM   #46
diyAudio Member
 
Join Date: May 2005
Location: TN
a schematic...
Attached Files
File Type: pdf my_ref.pdf (21.3 KB, 2941 views)
  Reply With Quote
Old 21st May 2005, 06:28 PM   #47
diyAudio Member
 
Join Date: May 2005
Location: TN
Doesn't succeed to send the enclosures. I retry...
  Reply With Quote
Old 21st May 2005, 06:28 PM   #48
diyAudio Member
 
Join Date: May 2005
Location: TN
If it has not arrived still nothing, have been censored ( and humbled ) even from the moderator. Thanks of the treatment.

Mauro Penasa
  Reply With Quote
Old 21st May 2005, 06:44 PM   #49
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Mauro, what's the problem? I CAN see your attachment.

Jan Didden
__________________
I won't make the tactical error to try to dislodge with rational arguments a conviction that is beyond reason - Daniel Dennett
Check out Linear Audio Vol 7!
  Reply With Quote
Old 21st May 2005, 06:47 PM   #50
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
So can I!
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  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



New To Site? Need Help?

All times are GMT. The time now is 03:00 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