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06 Feb

Just add two batteries, and perhaps the 2011 version of a Cmoy Altoids tin, and you have a fully functional very high quality headphone amp for under .

If you want a extruded aluminum case, pre-made front panel, rechargeable batteries, and AC wall adapter, just add another or so.

And I’m 99% sure it will also, overall, outperform the others.

I believe it will even embarrass many far more expensive rival or beat much more expensive products.

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In addition to the language in the CC-BY-ND License, the O2 design is offered “as-is” with no warranty of any kind, either expressed or implied, including its suitability for anything you might want to use it for. In plain English: If you can’t make the O2 work correctly, or as you had hoped, or damage your headphones, or your house burns down and your wife leaves you, you can’t blame me. For more, please see: Open Source Hardware This work is licensed under a Creative Commons Attribution-No Derivs 3.0 Unported License.

THE RESOURCES: Pictured to the right (click for larger) is the final PCB version.

Here the resources for the O2 project: POWER CYCLING & NOVEMBER DESIGN CHANGE: I revised R25 from 2.7M ohms down to 1.5M ohms and R9 from 40K down to 33K.

In this case, with as little as worth of parts, you can have a headphone amp that rivals the headphone output of the Benchmark DAC1 Pre in blind listening tests.

START HERE: There a lot of documentation on the O2. LESS WORRY: Unlike 99% of headphone amps, the O2’s performance has been fully documented on professional equipment under real world conditions.