【USB Sound Card】- External stereo sound card connects to 3.5mm audio headphones, earphones, speakers or microphone via a USB port. For better playback sound quality, and providing a powerful ...

[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 ...