You can whip up such a DAC with the GPIO pins of a Raspberry Pi. I did so once one afternoon while bored. I used 5% tolerance resistors I had in the toolbox.

You can whip up such a DAC with the GPIO pins of a Raspberry Pi. I did so once one afternoon while bored. I used 5% tolerance resistors I had in the toolbox. It was slightly more than adequate for understandable speech, and recognizable music, but the noise was atrocious. I suspect jitter was terrible as I was just toggling the pins from userspace approximately 40000 times a second. Still, it surprised me how effective it was considering it was literally made out of about 5 cents worth of wire.