Need to generate a high-quality sine wave using an Arduino? The folks over at Lab3 explain how it’s done with their Arduino DDS Sinewave Generator. Using direct digital synthesis and a Chebyshev filter, they claim that the system can produce sine waves from 0 to 16 KHz, with distortion less than 1% for frequencies lower than 3KHz.
So that is all well and good, but what is it good for? It turns out that they are using it to participate in WSPRnet, an amateur radio study of how well radio signals can propagate across the earth at any given time. Personally, I’m thinking about hooking one up to some speakers to see what kinds of sound I can create.