R4 Minima barebones direct-register code to use the DAC12 module in the RA4M1 processor. - TriodeGirl/Arduino-UNO-R4-Minima-Fast-DAC ...

So here in this Arduino DAC tutorial, we use an additional board called MCP4725 DAC Module with Arduino. MCP4725 DAC Module (Digital to Analog Converter) MCP4725 IC is a 12-Bit Digital to Analog ...

He put it all together on proto-board, although soldering the FM radio module was a bit tricky. The Arduino code is quite simple, and available for download (zip file).