Another "check my PCB layout" thread.

tbj · 12:22 PM

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.

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

Cheers,

R

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

tbj · 16th November 2012, 10:44 AM

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!

16th November 2012, 10:26 AM	#1
tbj diyAudio Member Join Date: Oct 2012	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. The 0 ohm resistor is just a thick wire link to get the speaker output. Cheers, R Edit: New layout - fixed problems shown below and shrunk slightly, added mounting holes. Last edited by tbj; 16th November 2012 at 12:22 PM. Reason: added new layout

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16th November 2012, 10:44 AM	#2
tbj 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!