Transformer for Mindstorm

I have LEGO mindstorm 2,0. and I wish to use a transformer instead of the 6 1,5V Batteries
but witch transformer do I need
The output on the Transformerh as to be 9Volts But how many Amp. or Watts
Hope someone knows the ansver
Niels Peter
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The Lego Train transformer is more than adequate. It is rated at 12 VAC 7 VA. This is then rectified to DC at 9 Volts. I have used one rated at 375 MA with success. This is from a telephone answering machine. The RCX will run at 7 volts if you cannot find any other. Be sure to maintain the polarity as you can damage the RCX.
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thanks. just the info I needed.
Niels Peter

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