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It's really simple: You power the op-amp with two 9-12v sources, then you feed the Amiga's output lines into the two IN pins on the op-amp, then you feed the OUT pins to IN on the volume pot, then the OUT from the volume pot goes to the headphone jack.
For the caps needed, just make sure you get a steady ripple-free vcc for the op-amp.. For other caps, check the op-amp's schematics for an example use.
I recommend something like NE5532P for the op-amp.
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