My LM3875 Poweramp - Page 2 - 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 February 2003, 05:15 PM   #11
diyAudio Member
 
Cradle22's Avatar
 
Join Date: Jan 2003
Location: Dortmund, Germany
Default Re: Re: My LM3875 Poweramp

Hi!

Quote:
Originally posted by halojoy
/halo - have a little less money, than others
and manage just as good anyway
/nice statement, I could include that one as well as my catchy line...

Instead of BG I take Panasonic FC, not that cheap, either, but compared to BG...

The only part I make no compromises are the PSU caps... BHC SlitFoil all the way (if capacitance exceeds 5000 uF, else I also take paralleled Pana FC)...

Still I keep spending too much money on audio electronics which I never use after they are finished...

Nice Weekend!

Arndt
__________________
************************
A Sacrifice For Freedom
  Reply With Quote
Old 7th February 2003, 05:51 PM   #12
diyAudio Member
 
platenspeler's Avatar
 
Join Date: Jan 2003
Location: Netherlands
Quote:
Originally posted by saletel
ok call me an idiot, but i've been wanting to do a gainclone amp for a while (not the reason i'm an idiot ) i only say that because i havent been able to find any schematics, so here i am asking. i'll probably be using lm3886t chips. so post a schematic for my simple mind. thanks
-Eric

I built this one: Click the image to open in full size.

Resulting in: Click the image to open in full size.

Internals: Click the image to open in full size.

Rest of story and links on http://www.euronet.nl/~mgw/diy/uk_index.html GeenKloon project.

regards,

Maarten
  Reply With Quote
Old 7th February 2003, 06:00 PM   #13
saletel is offline saletel  United States
diyAudio Member
 
Join Date: Nov 2002
Location: Clarksville MD
thanks for the links and schematics, now i jsut need time....
-Eric
  Reply With Quote
Old 7th February 2003, 11:04 PM   #14
diyAudio Member
 
Join Date: Feb 2003
Location: Las Vegas
Glad I read throw this post..Copy a schematic or two and checked my IC drawer and behold 1 LM3875. Junked a old mike amp for it's box and 2 hours later have a good looking single channel "Gainclone". Fired up with now problems and sounds pretty damn good. Didn't have anything other than a Spague 2.2 cap for the input but should do fine I'll hope. I'll look at it though the scope when I get a good tone generator, the one I use for R.F. amps is not to pretty.
Now I might just make a pair for my work room. I think for the size and ease to make that it sounds real good. Nice project...
Now to find a larger box or two that match.
  Reply With Quote
Old 7th February 2003, 11:20 PM   #15
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Quote:
The only thing I would change is the Black Gates.In my Opinion just a waste of money. And ordinary Resistors are absolutely good enough for any circuit.
Halo, just try BG once and you'll talk a different story. Keep your open mind and experiment first and criticise afterwards. You won't for sure, I can tell you that.

What's the point anyway of changing them when they are already built in ?? A real waste of money...

Jean-Paul
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 7th February 2003, 11:33 PM   #16
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
The only thing I would change is Black Gates too, but to non polar type N. They supposed to be twice as good as standard ones and 3 times more expensive.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 7th February 2003, 11:36 PM   #17
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Default Re: My LM3875 Poweramp

Quote:
Originally posted by hatasa
Hi,

Circuit base on the gaincone, but without the volume....

And the gain is lower than the suggestion circuit.

The Power supply cap using a pair of the 4700uf
working voltage at +/-35V

Using the 470uf for the by-bass

Resistance using with the RMG Japan...

Sound looks great, still running-in!

How does the sound compare to the Audio Research on the lower shelf?
Lovely rendering of the Gainclone by the way!
  Reply With Quote
Old 8th February 2003, 01:48 AM   #18
Banned
 
Join Date: Nov 2002
Location: Adelaide, Australia
Send a message via MSN to SkinnyBoy
I think they would look better one stacked on top of the other... lol,.. I think its time I did something. .
  Reply With Quote
Old 8th February 2003, 03:23 PM   #19
diyAudio Member
 
Join Date: Oct 2001
Location: Hong Kong
Send a message via ICQ to hatasa
Hi all,

Happy to got many feedback for the job....

Today I tried to operate the amp from 9am to 6pm. With the normal volume, ofcoz there are the room with the air condition.... The room temp. around 21c to 24c. I found that the case usually stand around 45-50c there! It looks quite stable....

I using the Redrose Rosebud Speaker
Preamp using with the Clone Marantz Model 7 tube line stage (And I dont think it matching well with the gainclone..... I building the new opamp preamp for the gaincone)

Source using the modified Pioneer DV-733A (US version should be Eilte DV47), with the LCaudio Zapfilter and the M2XO-1ppm clock module which using TCXO from the new company called MOD2.)

Will update more info on Monday..... bigeyes:

PS: Ah! Yes! Another amp which you saw on the photo is the AudioResearch Classic 30 Poweramp! :
  Reply With Quote
Old 12th February 2003, 11:55 PM   #20
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Does any one have any objections if I split this discussion off into another thread?

The subject has drifted slightly off topic

The new thread is here:

LM3875 Poweramp- reflections on components...
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  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
YAP - Yet Another PowerAmp syn08 Solid State 315 4th October 2011 11:39 PM
LM3875 Poweramp- reflections on components... halojoy Parts 101 15th February 2003 12:44 AM


New To Site? Need Help?

All times are GMT. The time now is 06:25 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