I made a CMOY amp with a JDS labs PCB.    Everything went smoothly, and I am pretty happy with the results.   I had no problem with assembly.  I was pretty hesitant to hook up something homemade to my DT900/600's, but after testing a good bit with some cheapo headphones, I took the plunge...

I'm looking into headphone amps for my laptop setup, and while I have space and don't need a headphone amp that will fit in my pocket, I'd still like one that doesn't need to run off of mains power to prevent me from having to run more long cables.   I've seen many portable amps that can do...