10 May
2017
10 May
'17
1:44 a.m.
I wanted to test one of the Lego motors without setting up the whole kit. The motor is designed for 4V DC. Dug through my bin of random wall warts. Closest I could find is 5V DC (and 0.5A but I'm not sure if that matters). Snipped off the wart's barrel connector, spliced a mini-banana lead to each wire, and the motor happily spun away. When I tested the Lego computer interface port voltage it showed around 3.7x on my multimeter whereas the wart produces 5 true. Will I cause any long-term damage to the 30-year-old Lego motor by running it at 25% higher voltage than intended?