My first GC finished

iceman · 29th June 2003, 08:53 AM

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

iceman · 29th June 2003, 03:51 PM

Okey, not the best quality.
Here are 1 picture of my Gainclone.
The heatsink is from an old Pentium II

Nuuk · 29th June 2003, 05:12 PM

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!

iceman · 30th June 2003, 05:04 AM

Hi !
I dont want to make both channels if it's sounds terrible.
But it sounds great so the second channel coming soon.

Nlights · 30th June 2003, 10:04 AM

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.

iceman · 30th June 2003, 05:23 PM

Hi

I hope it is, because thats all i got.
I've playing with low volume(probably between 1-2½ Watt) for about 1½ hour, and I could easily
put my finger on the IC. What happens when i turn the volume up? I dont know.

iceman · 30th June 2003, 05:25 PM

Hi again

I forgot:

My HTPC Celeron 1700 runs whitout fan & heatsink.
And the 1700 produce 19 Watt at full load.

Nuuk · 30th June 2003, 05:26 PM

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.

iceman · 30th June 2003, 06:44 PM

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.

ukram · 30th June 2003, 09:41 PM

All right! So now i can say it works :-) The coil looks too simple to me, but i guess it is not very important...

29th June 2003, 08:53 AM	#1
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	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 __________________ "Quis custodiet ipsos custodes?"

29th June 2003, 05:12 PM	#3
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	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! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

30th June 2003, 05:04 AM	#4
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	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. __________________ "Quis custodiet ipsos custodes?"

30th June 2003, 10:04 AM	#5
Nlights diyAudio Member Join Date: Jun 2003 Location: Sweden	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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30th June 2003, 05:23 PM	#6
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	Hi I hope it is, because thats all i got. I've playing with low volume(probably between 1-2½ Watt) for about 1½ hour, and I could easily put my finger on the IC. What happens when i turn the volume up? I dont know.

30th June 2003, 05:25 PM	#7
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	Hi again I forgot: My HTPC Celeron 1700 runs whitout fan & heatsink. And the 1700 produce 19 Watt at full load.

30th June 2003, 06:44 PM	#9
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	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.

30th June 2003, 09:41 PM	#10
ukram diyAudio Member Join Date: Jun 2003 Location: Espoo, Finland	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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