The recent Design Idea “Getting an audio signal with a THD < 0.0002% made easy,” discloses a low THD sine generator which led me to dust off a design that I had published in AudioXpress magazine [1] ...

Microcontroller addict [Debraj] decided to make his own programmable sine wave generator, and was able ... Arduino controlling the AD9833 chips and two programmable gain amplifiers (MCP6S31).