New answers tagged electronics
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I don't have this set, so I can't provide a fully authoritative answer, but 9V is likely to be safe for these motors. The hub that drives them is definitely 9V, as it connects with the rest of the 9V system and runs on 6 AA batteries:
TLG typically overspecs their motors somewhat, so you could probably also get away with running the motor using 12 volts, ...
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