I hope this is the correct place to post this question. If not, I apologize.
I would like to connect a sound playing device (speaker, headphones), which ever is easier, to my ARM's ( LPC2138 ) DAC converter. My question is, what should the circuitry - that is connected to the ARM's DAC pin - for the speaker be. I am not interested in the quality of the sound, all I need is a rough sound, to see that it works.
you can select amplifier according to your speaker watts. If it is a 5w speaker then you can use amplifier with UTC820 ic (8 pin chip) and the circuit is very simple also. Google it. A large number of audio amplifier IC s are available in market , with different watts and many other specifications. UTC820 is one example , for driving low power speakers say 5w.