I bought a neat Merry Go Round at Home Depot that is a nice O Gauge size and operates well on three AA batteries (4.5 volts DC) and planned to change the power supply to a DC transformer. But the accessory does not operate on 4.5 VDC coming from a DC power pack set to 4.5 volts, or two different wall packs that put out voltages close to 4.5. This accessory has two small motors, flashing LED's and music playing. I have simply replaced the two wires going to the board that controls these functions from the battery pack to my Transformer DC outputs being aware of polarity. Do batteries put out a slightly different DC than transformers? I have often done this sort off thing before!! Phil
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