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Old 29th June 2003, 09:53 AM   #1
iceman is offline iceman  Sweden
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Talking My first GC finished

Hello !

I now finished my first GainClone(LM3875), and i sounds great.
I post some pictures later.(or tomorrow)
The schematics i used was this one from "Ukram"

http://hepso.dna.fi/misc/LM3875/LM3875_amplifier.html
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Old 29th June 2003, 04:51 PM   #2
iceman is offline iceman  Sweden
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Default pictures

Okey, not the best quality.
Here are 1 picture of my Gainclone.
The heatsink is from an old Pentium II
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File Type: jpg bild2.jpg (18.7 KB, 685 views)
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Old 29th June 2003, 06:12 PM   #3
Nuuk is offline Nuuk  United Kingdom
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Hi Iceman and well done with your first GC. Have you done a stereo pair yet or just one channel?

BTW - bad luck about your car this afternoon!
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Old 30th June 2003, 06:04 AM   #4
iceman is offline iceman  Sweden
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Default My first GC finished

Hi !
I dont want to make both channels if it's sounds terrible.
But it sounds great so the second channel coming soon.
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Old 30th June 2003, 11:04 AM   #5
Nlights is offline Nlights  Sweden
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Default Heatsink

Is the heatsink big enough for the lm3875 ( how hot does it get? ), I was thinking of using a P4 heatsink for my gainclone, since I can't really find anything else that is suitable and doesn't cost a fortune where I live.
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Old 30th June 2003, 06:23 PM   #6
iceman is offline iceman  Sweden
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Hi

I hope it is, because thats all i got.
I've playing with low volume(probably between 1-2 Watt) for about 1 hour, and I could easily
put my finger on the IC. What happens when i turn the volume up? I dont know.
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Old 30th June 2003, 06:25 PM   #7
iceman is offline iceman  Sweden
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Hi again

I forgot:

My HTPC Celeron 1700 runs whitout fan & heatsink.
And the 1700 produce 19 Watt at full load.
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Old 30th June 2003, 06:26 PM   #8
Nuuk is offline Nuuk  United Kingdom
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Quote:
Is the heatsink big enough for the lm3875 ( how hot does it get? ),
This is one of those 'how long is a piece of string' questions

It depends on the rail voltage that you drive it with and how loud you listen.

If you keep the rail voltages around 26-27V (18-0-18 transformer) and don't go stupid with the volume, a PC heatsink should do the job (for one chip).

They are certainly cheap enough to try and if they do get too hot, you could try adding a thicker piece of aluminium bar.
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Old 30th June 2003, 07:44 PM   #9
iceman is offline iceman  Sweden
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I use a 18-0-18 V transformer(25.2 V) and i dont use it to play for my neighbours.
If it's break dosent matter because it so cheap.
Total cost for my mono Gainclone exkl board and transformer is
about 16
I got the LM3875 as free samples from National.
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Old 30th June 2003, 10:41 PM   #10
ukram is offline ukram  Finland
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All right! So now i can say it works :-) The coil looks too simple to me, but i guess it is not very important...
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