Hello,
i hope the tag is correct. I was wondering about this for a while. a couple=
 of years ago i bought a portable speaker, with cable and ipod dock, powere=
d both via batteries and usb. I crossed my fingers and one day i linked the=
 speaker with my pc. nothing. only power... but why? Unfortunately i don't =
know much about USB protocol, but since it is a serial port it shouldn't be=
 hard to write a software that sends the sample... or calculate the PW for =
a "simulated" class D then send only the 1 and the zeros... am I mad o_O???=
? because i haven't found anything yet and my old teacher told me "good luc=
k if you want to learn usb by yourself, it's very hard to find technical re=
sources of any kind"

Jacopo Monegato
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