Posted June 16, 20195 yr hello, I just bought the app-controlled batmobile, but when I use it in the second mode of use, speed control, from the app on my phone, a high-pitched sound is heard, in theory it should work normally, but it only works in normal mode without speed control, the same thing happened to me with the remote control of trains, same sound, maybe tlg has a problem with motors controlled by speed or I'm not lucky,by the way i tested without gears or conected to anything else, and the same thing that train remote control
June 16, 20195 yr Author 17 minutes ago, Zerobricks said: Have a read here: https://en.wikipedia.org/wiki/Pulse-width_modulation The problem is not sound, it is when the pitch sound stars, the batmobile run to slow, it lost al the power, works fine with no speed control, forward/reverse mode on the app
June 16, 20195 yr Author he problem is not sound, it is when the pitch sound stars, the batmobile run to slow, it lost al the power, works fine with no speed control, forward/reverse mode on the app
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