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Chip Amps Amplifiers based on integrated circuits

My LM3875 Poweramp
My LM3875 Poweramp
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Old 7th February 2003, 05:15 PM   #11
Cradle22 is offline Cradle22  Germany
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Default Re: Re: My LM3875 Poweramp


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!

A Sacrifice For Freedom
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Old 7th February 2003, 05:51 PM   #12
platenspeler is offline platenspeler  Netherlands
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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

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.


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Old 7th February 2003, 06:00 PM   #13
saletel is offline saletel  United States
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thanks for the links and schematics, now i jsut need time....
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Old 7th February 2003, 11:04 PM   #14
Boxbldr681 is offline Boxbldr681  United States
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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.
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Old 7th February 2003, 11:20 PM   #15
jean-paul is offline jean-paul  Netherlands
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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...

It's only audio. Member of the non modular PCB design committee
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Old 7th February 2003, 11:33 PM   #16
Peter Daniel is offline Peter Daniel  Canada
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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.
“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
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Old 7th February 2003, 11:36 PM   #17
grataku is offline grataku  United States
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Default Re: My LM3875 Poweramp

Originally posted by hatasa

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!
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Old 8th February 2003, 01:48 AM   #18
SkinnyBoy is offline SkinnyBoy  Australia
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I think they would look better one stacked on top of the other... lol,.. I think its time I did something. .
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Old 8th February 2003, 03:23 PM   #19
hatasa is offline hatasa
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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! :
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Old 12th February 2003, 11:55 PM   #20
pinkmouse is offline pinkmouse  Europe
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My LM3875 Poweramp
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:

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?
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