Simple Audio Amp for FPGA audio to PC
If you are looking for a simple audio interface with volume control, you can do a quick search on internet for such, but if you want recommendation based on personal experience, I would suggest LM4811, which is a simple, low cost and easy to use headphone amplifier from TI.


http://www.ti.com/product/lm4811

If you work for a company, you can register at TI and ask for a couple of samples. They are not easy to solder, but you may ask someone for help to get it on a test board.