My boyfriend Danny is out of the country and his access to internet comes and goes. Can't give too much information on him. He writes me and wants me to look up information on amplifiers and chips. He likes to tinker and tweek the radios, walkmans and stuff for his buddies. I don't understand half of what he is asking, so I thought I would join on here and maybe someone can help me find the information that he needs?
His resources are limited, basically he cannibalizes what isn't being used and puts together other parts.
The latest request is information on "battery powered audio power amplifiers"

Any help is appreciated!