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Cheap Chinese DAC board

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This is a cheap Chinese DAC board. Possibly a good project for customizing upgrading if you have the knowledge and skill.
$20 paypal includes shipping to lower 48 US states.
Takes a 15v DC power supply which is not included. Or can use a +15/-15 power supply if you unsolder the jumper just behind the power plug.

It doesn't come with any instructions but jumper J1 and J2 select the input (coax or optical) and J3-J5 select the filter but I haven't found anything saying which filter is which jumper settings.
 

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