My second board is this Amplifier. I haven`t tested it yet, so that I am not sure, whether and how it works. If it works, then I do not think, however, that the sound will blow you away. I rather think that the output current is not much greater than the input current. But on occasion I will build and test the circuit. You can operate the circuit with a 9 volt battery, I believe (or at least I hope). The values are not there, I do not know how to do that, but I will if I have time, post a list.