[waiquoo]

XR2206 chips are pretty useful as cheap function generators for analog projects.

[dfox]

Except the fact that XR2206 and all similar analog sig-gen-on-a-chip devices are obsolete and essentially unobtainable as raw parts. Ok, you can buy cheap chinese "arduino-like" module that purportedly is built around such chip....

[cushychicken]

Yeah! I've actually wondered how far you can get doing this same project by adding digital control to an XR2206.