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Old 16th November 2012, 10:26 AM   #1
tbj is offline tbj  United Kingdom
diyAudio Member
Join Date: Oct 2012
Default Another "check my PCB layout" thread.

Decided to build my LM3886 amp on PCBs after all, and after a few days' work I've come up with this. I've focused on keeping everything as short as possible, but working around a solder-mount heatsink I'm using (and had to draw the component for in Eagle).

Signal ground and power ground are seperated and connected only by a small trace.

If someone could let me know what they think and if there is room for improvement, I'd be ever so grateful.

Click the image to open in full size.

The 0 ohm resistor is just a thick wire link to get the speaker output.



Edit: New layout - fixed problems shown below and shrunk slightly, added mounting holes.

Click the image to open in full size.

Last edited by tbj; 16th November 2012 at 12:22 PM. Reason: added new layout
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Old 16th November 2012, 10:44 AM   #2
tbj is offline tbj  United Kingdom
diyAudio Member
Join Date: Oct 2012
Hmm. OK. Just picked up on a few things myself when looking at it again.

- the trace connecting signal and power ground should be moved to the ground point in the center of the chip instead - at the moment it's in the worst possible place, especially as -
- the speaker ground doesn't have enough groundplane - I will solve this by moving the SPK pad up a bit to expose more copper.

Do your worst!
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