Open Power Functions

I’ve been working a lot at my Lego Power Functions receiver, I’ll summarize what’s been going on:
– I’ve had a lot of trouble with the motor driver; during development I added some series resistors to the motors I used, which kept the driver running at all input conditions; now I’m trying the real LEGO motor, I run into some issues with a driver IC. I can’t sort out how to solve them, so I’ve replaced the motor driver IC. This unfortunately means that the solderability of this board has moved to ‘undoable for people without hot air guns’.
– I’ve asked LEGO whether I would be allowed to sell this design, and with some restrictions, I am! Hooray! Maybe I can a little money with this, that would be very cool….


2 thoughts on “Open Power Functions

  1. John says:

    I have a question and you seem to be very knowledgeable on power functions.

    Can I simply provide a higher voltage to the power functions to get more power out of the motors? If so what is the maximum? I was thinking 12v but am afraid of blowing stuff up.


    • admin says:

      Hi John!
      The motor driver for the original receiver is the LB1948, its maximum operating voltage is 16V. I think the other electronics is behind a linear regulator, I don’t know what the max voltage for that regulator is.
      Driving to 15V seems safe to me, do mind that it might overheat and shut down the outputs!

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