Hey again, working on my speaker project and recently shipped in a nice cheap chinese amp for it. Chucked out the huge old hifi boards and this works just as well! Final thing I'd like to do is hook up a 12V lead acid battery I have here, so that I can make it portable on occasion. This amp has a barrel jack for a wall adapter, but I'm wondering if I can simply solder on a switch to the jack/diodes and wire it to the battery terminals, so I can switch between off/battery/wall adapter. Here's some pictures, with the easiest access to the board I have at the moment. Could take it completely apart if required I guess.