Actually getting the beats out of the Arduino required the addition of a R2R DAC circuit and a TDA2822 amplifier. In the video after the break, you can hear the results for yourself. [joekutz] is ...

That’s where the digital to analog (DAC) voltage converter comes in. In this session, we’re going to be putting together a simple DAC so that later on we can use our logic circuits to put out ...

The I65GV25_R2RDAC_01 specifies a 10-bit R2R DAC. At the output side a voltage-mode buffer is used to generate the output voltage and filter out the excess out of band noise.