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Old 25th February 2012, 01:42 AM   #1
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Join Date: Sep 2011
Default Surface Mount Headphone Amp

I'm pretty new to DIY audio, but had allot of fun making my own Gainclone (including designing my own boards) based off of this design:
PA100 DIY 2x LM3886 in parallel gainclone audio amplifier

I wanted to try something with SMD components, and my CMOY that I had thrown together while waiting for the boards for the Gainclone deserved to be revisited.

Thought I would share my board design here, any feedback would be great, like I said, when it comes to audio I'm a total beginner!

The schematic is the same as the generic CMOY, and I would be happy to share my eagle files if anyone wants them.

Click the image to open in full size.
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Old 25th February 2012, 01:29 PM   #2
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You may want to include two small 100 nF X7R ceramic caps for rail decoupling to ground next to the opamp. Should easily be doable when shifting things around a little.

The top layer underneath R1/3/5/7 looks a little strange with those holes in it.

Input and output channels and supply polarity are not marked on silkscreen, you may want to add that.

If this triangular piece in the bottom layer undernath the opamp is supposed to be connected to ground, you may want to make the connection a little more substantial.

So GND is your star ground?

Could it be that the ground on the bottom layer forms a loop?
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Old 28th February 2012, 12:38 PM   #3
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Nice work. Could you share the eagle files with PM to me?
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Old 28th February 2012, 05:19 PM   #4
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Sgrossklass, Thanks for the reply!
I like the idea of adding the decoupling caps, and labeling the polarity of the Inputs/outputs

Those "holes" under the resistors is a result of the way eagle is handling the ground pour... I'll have to find a way to change the isolation for pads on the same net.
As for that triangular pour underneath the op-amp, It is supposed to be connected to ground, but it's only there for shielding, and doesn't actually connect any traces, so I think it is fine?

Spacehead, sure thing!
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Old 28th February 2012, 07:07 PM   #5
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I think PM attachments are not possible, but you can attach to here.
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