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I'm having a hard time figuring out what size the input plug is (that plugs into the regulator) on the original LEGO version so I can search for it. I'd prefer not to have the transformer have variable volts in case it gets switched to a higher value accidently and burn up the regulator.
@dragon114 If you find one that works, be sure to post back with the source.
Specs are as follows
Input : 230VAC/115VAC depending on your country
Output : 10VAC 700mA
Plug : 5,5/2,1mm
If you cannot find an AC transformer, you can use a DC one. but I advice to pick a 12V over a 9V type as there are losses in the conversion. Polarity does not matter
In all cases I recommend finding a 1500-2000mA type if you're running two motors or have a large rail setup
The internal regulator is very well protected, so don't worry