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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!