Here's an 8-bit resistor DAC on Arduino Uno that I built during the weekend, playing a techno loop @ 16KHz. Not exactly the best audio quality, but it's my first own Arduino project (: Also recording the audio on iPhone doesn't help. http://www.youtube.com/watch?v=4UraCirYapA I had bunch of random resistors laying around so I measured resistance of each (~150 total) and wrote a small app that gave me the closest matching parallel resistor pair for each pin.
Pretty cool. Can you post your code?
Sure, the Arduino code has a simple timer interrupt pushing the PCM samples stored in program memory to the pins.
test.ino (157 KB)