Bob, there are converters to change your transformer AC to DC, if you want to go that route help can be provided. Or, if you do decide on a separate DC power supply, shop around. There are many adjustable DC wall warts on the market giving a variety of voltage selections.(3 to 12vdc) Additionally, something bigger on the amperage side (30 amp) can be cheaper also. Just found this one from a US supplier on ebay as an example. Click on image for larger view. I use one of these 12vdc-30amp devices myself, and vary the voltages I need to the task at hand.
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