New Fully Integrated LM3886 GC

Arius · 25th March 2005, 11:39 PM

Finished my integrated LM3886 GC at last. It's a low cost, fully integrated 20W+20W with preamp, buffer and PSU onboard.

It's designed to be low-cost as it's intended for my computer gaming speakers. Yet it sounds really good and lab measurements show max power at 30W RMS per channel and 0.0V DC offset. With the preamp section bypassed, it's totally noise/hiss free at the output.

I put everything on the PCB (even transformer & heatsink) as I wanted to drop it into a small, low profile case.

If anyone's interested, I have schematics, PCB layout and lab measurement data that I can post. There's also a few bare PCB's left from the proto build.

Thanks for looking.

PS: Sorry for the low-res pic. Had to take in a hurry.

Arius · 25th March 2005, 11:53 PM

Here's an overview of the PCB layout. Ground plane is on the bottom layer and is not shown.

paulb · 26th March 2005, 12:38 AM

Lots of parts. Looks good.
What's the long DIP IC in the upper right corner?

Leolabs · 26th March 2005, 01:57 AM

Why not try to manufacture more and sell them???Lokks so good!

DC Dave · 26th March 2005, 02:19 AM

Very nice. Should make for a very compact little amp. Did you have a chassis in mind when you started? Also, what tranny did you use?

sivan_and · 26th March 2005, 02:31 AM

Electrically good!!
Mechanically..POOR design..
Whats the point in having the Tranny on the PCB? hope it will not break the PCB...Single module look? what about the PCB space wasted?

Upupa Epops · 26th March 2005, 04:49 AM

Very nice design !

jpg · 26th March 2005, 04:13 PM

Quote:

Whats the point in having the Tranny on the PCB?

You mean the transformator?

(I'm asking because "tranny" makes me think of a transistor which usually isn't misplaced on a PCB.)

Arius · 26th March 2005, 09:13 PM

O_o the transformer question.

It's only a 80VA part (more than ample for 20W + 20W output) so it's weight it's not a problem.

The main reason I wanted the transformer on the PCB is that this design will also be built by some students that I am mentoring. Some of them have a tendency to run the amp as it is and I didn't want any AC wires dangling for safety reasons.

I left my documentation at my work PC so I'll post schematics and such on Monday if anyone's interested. Thought it'll make a nice first time project for newbies.

sss · 26th March 2005, 09:30 PM

the pcb looks good , did u make it yourself?

26th March 2005, 02:31 AM	#6
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	Electrically good!! Mechanically..POOR design.. Whats the point in having the Tranny on the PCB? hope it will not break the PCB...Single module look? what about the PCB space wasted? __________________ SivanandBalan

26th March 2005, 09:30 PM	#10
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	the pcb looks good , did u make it yourself? __________________ if you are not living on the edge you are taking too much space

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26th March 2005, 12:38 AM	#3
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Lots of parts. Looks good. What's the long DIP IC in the upper right corner?

26th March 2005, 01:57 AM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Why not try to manufacture more and sell them???Lokks so good!

26th March 2005, 02:19 AM	#5
DC Dave diyAudio Member Join Date: Feb 2004 Location: Washington DC	Very nice. Should make for a very compact little amp. Did you have a chassis in mind when you started? Also, what tranny did you use?

26th March 2005, 04:49 AM	#7
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Very nice design !

26th March 2005, 09:13 PM	#9
Arius diyAudio Member Join Date: Mar 2004 Location: California	O_o the transformer question. It's only a 80VA part (more than ample for 20W + 20W output) so it's weight it's not a problem. The main reason I wanted the transformer on the PCB is that this design will also be built by some students that I am mentoring. Some of them have a tendency to run the amp as it is and I didn't want any AC wires dangling for safety reasons. I left my documentation at my work PC so I'll post schematics and such on Monday if anyone's interested. Thought it'll make a nice first time project for newbies.

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