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Computer PSU are big, but they're also convenient. In my own scanners I use dual voltage power supplies salvaged from networking equipment. I found several at a local surplus shop and they're perfect. They're also nearly brand new. They're nice to work with because they're just a circuit board. Really you can use anything that will supply the proper voltage of clean DC. Look around salvage or electronic surplus shops if you have any near you. You can also buy the type that I just described new from electronics parts suppliers like Mouser and Digikey.