This first sample was generated by creating the DAC circuit found on Make Magazine’s site (http://makezine.com/2008/05/29/makeit-protodac-shield-fo/). The demo on Make’s site says it would make a Sine wave, but that’s not true, it was much more of a Sawtooth.
This second sample was generated by using an online generator found at (http://www.audiocheck.net/audiofrequencysignalgenerator_sawtoothtone.php).
If the sound samples do not show up on your browser, please feel free to download them here: WeTransfer