Hi @carol_84
As the nano directly is not possible as it uses the Atmega328 which does not have the DCA circuit.
But using an external DCA receiving the information coming from the nano is possible.
You can also try doing this:
https://create.arduino.cc/projecthub/Arduino_Scuola/build-a-simple-dac-for-your-arduino-4c00bd
RV mineirin