My lm3886 GC

enzie · 21st April 2005, 10:23 AM

My project was frozen for about two years until I found this forum and all the posts about how good the sound quality with these chips were

. So after a few months DIY'ing my project is finally almost finished and I decided to introduce it. It's a stereo setup at the moment but there's space for 4 more amp modules and another power supply...

It's based on the schematics found here. The trafo is a 2x25V 630VA with snubberized power supply based on the carlosFM desing.

Here's some pictures.

sek · 21st April 2005, 01:09 PM

Hi,

were you participating in the 'group buy' on the forum in poland?
Sorry, can't understand the thread you linked to...

Or did you etch the boards yourself from the tested layout?
Can you compare to other gainclone circuits/concepts?

Anyways, how does it sound?

Cheers,
Sebastian.

enzie · 21st April 2005, 03:07 PM

I made a few layout changes to the pcb and then etched them myself. I have been listening 'em for a few hours now and it sounds quite good.. I'll have to test it with different kind of music. And I am feeding the amp from the Yamaha rxv-440 Headphone socket so with a real preamp it'll propably sound much much better =)..

enzie · 21st April 2005, 03:09 PM

and pic from the inside.

G4ME · 21st April 2005, 03:22 PM

looks very similar to the idea i have in my head for my stereo 2 way w/ active cross over.

BTW how come you didn't use the ground on the IEC connector?

GregGC · 21st April 2005, 07:05 PM

Quote:

Originally posted by enzie
I made a few layout changes to the pcb and then etched them myself. I have been listening 'em for a few hours now and it sounds quite good.. I'll have to test it with different kind of music. And I am feeding the amp from the Yamaha rxv-440 Headphone socket so with a real preamp it'll propably sound much much better =)..

Very nice work.

Why don't you put 50k pot and drive it directly from the CD player? The pre of the Yamaha is not very good.... Personal experience.

Greg

enzie · 22nd April 2005, 03:39 PM

The IEC ground is connected to chassis but it's hard to see in the pictures.

I am planning to keep this as a power amp design so I won't be using any pots here. But I am planning to make a proper pre-amp for this as soon as I find some good design that suits my needs.

troystg · 28th April 2005, 05:28 PM

I don't see a fuse on the pwr input.

All else looks good.. I like the short RCA and spkr leads.

In-line fuse for safety please.

whoa · 2nd May 2005, 04:55 AM

Quote:

and pic from the inside.

oh my!

nice heatsink

nice trafo

nice amp!!!

21st April 2005, 03:22 PM	#5
G4ME diyAudio Member Join Date: Jun 2003 Location: Location: Location	looks very similar to the idea i have in my head for my stereo 2 way w/ active cross over. BTW how come you didn't use the ground on the IEC connector? __________________ Two little mice fell in a bucket of cream. The first mouse quickly gave up and drowned. The second mouse, wouldn't quit. He struggled so hard that eventually he churned that cream into butter and crawled out.

28th April 2005, 05:28 PM	#8
troystg diyAudio Member Join Date: Apr 2004 Location: Lousy Anna	I don't see a fuse on the pwr input. All else looks good.. I like the short RCA and spkr leads. In-line fuse for safety please. __________________ Troy Thinking positive doesn't make things better, it makes you a better person.

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21st April 2005, 01:09 PM	#2
sek diyAudio Member Join Date: May 2003 Location: Berlin	Hi, were you participating in the 'group buy' on the forum in poland? Sorry, can't understand the thread you linked to... Or did you etch the boards yourself from the tested layout? Can you compare to other gainclone circuits/concepts? Anyways, how does it sound? Cheers, Sebastian.

22nd April 2005, 03:39 PM	#7
enzie diyAudio Member Join Date: Jan 2005 Location: Finland	The IEC ground is connected to chassis but it's hard to see in the pictures. I am planning to keep this as a power amp design so I won't be using any pots here. But I am planning to make a proper pre-amp for this as soon as I find some good design that suits my needs.

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