[Joekutz] wanted to re-build an audio-rate function generator project that he found over on Instructables. By itself, the project is very simple: it’s an 8-bit resistor-ladder DAC, a nice enclosure, and the rest is firmware. [Joekutz] decided this wasn’t enough. He needed an LCD display, a speaker, and one-hertz precision.…
Source: Fun Audio Waveform Generator Is More Than The Sum Of Its Parts