Lm3886 pcb

[Wizardmaxx]

Just thought I would drop an LM3886 PCB layout for others to use.

I have built it and can verify that it does work.

Any suggestions on improving it will be appreciated.

3886 6.pdf

3886 7.pdf

3886 8.pdf

[merlin2069er]

Very nice looking layout.

What did you use to route your board?

[CJ900RR]

Nice layout.

It's routed with Eagle. You should provide a schematic and also make the copper around the pads bigger, cause Eagles original are a pain to solder, specially if you etch them at home.

[Wizardmaxx]

Hi Merlin

I used Eagle lite and did the routing manually.

I have picked up some mistakes so far

- The lower 1000uF cap needs to be reversed so that -ve is on the edge
- The 100uF cap needs to be reversed
- The 47uF cap needs to be reversed

Wizard

[ratza]

Very nice. How do you make those copper islands in Eagle? Polygons, by any chance?

[Wizardmaxx]

Hi Ratza

Islands made using overlapping tracks. You don't want to see the error report, but hey it works.

Attached are the corrected layouts with pads slightly larger.

3886 6.pdf

3886 7.pdf

3886 8.pdf

[ratza]

Thanks Wizardmaxx. I asked because I use polygons and it never crossed my mind that round edges can also be used

[Dxvideo]

Dont you think the power and GND traces a bit thin?

[ratza]

They're not. Mine are 80mills in width and they widstanded an unwanted short between a rail and GND. I have a 400VA toroid and 22Vca per rail. That's translated in alot of current in case of short circuit (9A between rails or 18A per rail).

[gadelhas]

Hi wizardmarxx;

Can you provide the schematic? Regards