Hi All,
so some lifestyle changes resulted in listening a bit more through a pair of cans and to that I dusted off my (vintage?) AKG K-500 that I still like. The spare SB3 that I kept in a drawer doesn't have the oempf to drive these headphones properly. So something was needed and through fellow DIY'ers I was pointed towards to TI's TPA6120A2 headphone amplifier chip. I could have build a standalone amplifier that takes the signal from the SB3 but that would result in a less practical solution (2 boxes, cables, ...) to move around in the house. A single box solution is preferred and now that winter is upon us and we have long evenings it is perfect time for a DIY project (instead of being a coach potato). There are many other headphone amps designs out there but I liked the simplicity of using the TPA. Although 'simplicity': the TPA needs some thoughtful PCB design to prevent stability issues. So far I got myself a Pi Zero 2W and a DAC from Hifiberry. To my surprise the headphone amp on that DAC board drives my AKG a bit better, but still need to crank up the volume quite a bit. So I guess I still am on for an amp with some more gain. The player will not be outfitted with a screen or IR receiver (at least for now) but will get some buttons. Most of time I use a tablet/phone to control LMS. But it is good to have a few buttons like play/pauze/mute/volume. The internals should be a tidy as possible, I dislike multiple boards tied together with a cable loom. Parts, case, schematic, look and feel. It goes all hand in hand and influence each other so I made already some possible Cases, PCB layout concepts. The case will likely be something like this (this one is about 25cm/10" wide) but will not be the final version. 36414 Obviously working on a schematic too. 36413 And gettig some idea about the pcb (although this is already out-dated....) 36412 As you see I'll not stack the DAC on the Zero, I don't want the DAC to cover the antenna area, it probably will not be a real issue (I have it stacked at the moment too without issues) but I also want the whole PCB to have a low profile. So far for now. +-------------------------------------------------------------------+ |Filename: Kast2.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=36414| +-------------------------------------------------------------------+ does the all-black SB sound better than the white SB? ------------------------------------------------------------------------ hsmeets's Profile: http://forums.slimdevices.com/member.php?userid=9716 View this thread: http://forums.slimdevices.com/showthread.php?t=115553 _______________________________________________ diy mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/diy
