Not my finest breadboard work, but it turned out ok...
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fcdn.head-fi.org%2F1%2F16%2F900x900px-LL-1678267f_IMG_5222.jpeg&hash=e857e7efb4ae01d6c4c9b2842105dd1a0cfcb041)
(power supply not installed yet, but it's just a simple TLE rail splitter with a couple caps.
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fcdn.head-fi.org%2F9%2F93%2F900x900px-LL-931c5348_IMG_5223.jpeg&hash=a1bf4c8e5134bb9d9348854c40c4818675da452d)
Yeah I know, some of those are pretty ugly joints. I went back and touched up most of them after the pic (as well as did a few that I missed the first time) and trimmed off those excess leads
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fcdn.head-fi.org%2F4%2F4e%2F900x900px-LL-4e326fbc_IMG_5229.jpeg&hash=12366f4328fe15e9c0505a4d39436fe221956900)
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fcdn.head-fi.org%2Fc%2Fc7%2F900x900px-LL-c75b9f3a_IMG_5219.JPG&hash=b43a6c50078f687384ac53da5540ed51314ff78d)
(the intended board layout was cleaner with everything running vertical or horizontal, but I goofed up midway and wound up jiggering things on the fly
This was a nutty headphone amp project that I cooked up to mimic Jan Meier's "active balanced ground" topology:
http://www.meier-audio.homepage.t-online.de/grounds.htmThree dual opamps were used. The first as an input buffer and where the bass boost switch is located. The other two for the output channels.
I think I managed to squeeze in a gain switch somewhere in there too. My mistake, it was a switch for an output pad resistor.