I bought an AKG K702 a while ago when it’s on sale. While it sounds awesome when plugged into my old good M-Audio Fast Track Pro, the same cannot be said about the headphone jack on my PC at work, so I felt the need for a portable standalone USB audio DAC and headphone amp. And of course --- why not build one myself!
Specs:
* USB in, 3.5mm TRS jack out
* Analog volume potentiometer
* DAC max data rate: 24 bit * 192 kHz
* Max output voltage: 3.9 Vpk = 7.8 Vpp = 2.76 Vrms
* Max output current: 125 mApk
* Analog low-pass filter: -0.1 dB @ 20 kHz, -40 dB @ 700 kHz
I've spent way too much $ on this project --- would be a shame if I leave it in a naked state, but I am really reluctant to make a custom enclosure and have someone machine it because it's more $$$. So in I opened Digikey catalog, picked a box that roughly fits the main board, loaded the 3D model in CAD, put some holes in the box, and voila:
Now I need a drill press... better a mill. Or I could use my old good flush cutter and tear that damn piece of plastic off.
Hey, can you tell me which chip device you are using in your Headphone device? I'm making the similar project, you can see here the detail https://www.boneheadphone.com/vizio-sb3821-c6-review/ and I want to use the same chip.
Not sure what your project is (I see a review for a Soundbar).
There are multiple chips in this project: The USB-to-I2S bridge (now discontinued), the 2-channel DAC, and op-amps. You can find out what exactly they are in the Excel file I uploaded (in the project files section).
Good job for information
check my site
https://bijlimart.com/how-to-fix-bluetooth-headphones-when-only-one-side-works/