I must ask the crucial question - does it improve the sound over the inbuilt amp in most portable devices?
I'd never even heard of Tung oil before but it is obviously a popular treatment. Certainly I had heard of Linseed oil but it seems to have a few more downsides compared with tung. Thanks for the link, some great info there.
Beautiful work! May I ask why you chose to use oil instead of, say, wax, polyurethane or varnish on the wooden top?
Should the capacitor not be in series with the output, rather than the input? To prevent DC bias from driving the speaker?
Great instructable, a couple of questions/observations if I may:It looks as if you have the fan in series also, is that intended? Any reason you didn't put the fan in parallel with the load? Won't this severely limit the output?IMO the wiring diagram would be clearer if you were to mark the red and black wires of the peltier plates, since they are all black it's not so obvious how to wire them.Thanks!