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Originally Posted by greencactus3
1.) the lego RCX trick wayish thing... get a 5v motor. connect the motor to a switch. have that switch connected to another power source(12V) & the 12Vmotor. so basically your 5v motor will mechanically operate the mechanical switch to operate the 12v circuit(motor).
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you can do this by just using a 5v relay and letting the relay act as the switch that turns power on to the 12v motor