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then it should be a simple thing to do just make sure all of them are DC and not AC (rare after downpowering though). just sum all the ampers to get a big enough supply. Get something with variable voltage so you can buy the same device for both chains (9V, 12V). What you need to look at are the total amount of ampers on the existing supplys outputs, not inputs, to get the correct effect for your next supply. My computer supply is 19V, 4,5A which equals 85W. Four of five of those and youll have a pretty big supply, which would generate alof of heat. Put it under your window.
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