For a project, I need to be able to record at a sample-rate of at least 500 kHz. I want to use a Raspberry Pi, but I know that it has no interface with sound. I found the Wolfson Audio Card for the Raspberry Pi on line, but that only goes up to 192 kHz. Does anyone have any suggestions on anything that I could interface with the Raspberry Pi to get these sound recordings done?
How about a Red Pitaya board to do the sampling, and the Pi to store the data.
500 kHz is about 1 MB/s, you should be able to write this to disk fairly easily.
Also, unless you're experienced with it, you should buy rather than build the analogue front end. There are much bigger pitfalls than just transferring the data - noise will creep into the analogue path in all sorts of ways.