and the Raspberry Pi outputs sound via the native Alsa driver and a USB sound card. This project goes a long way to show how much simpler a project like this is once you find the right hardware fo ...

[TMSZ] has a better option, a ~1 dollar USB sound card which is easily hacked to work as a simple oscilloscope. Easily found on eBay, the 7.1 virtual channel sound card is identical in brains to a ...