Updates

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  Brian Hopkins Is it normal for my Sbrick to hum like a banshee?  

  • February 5, 2015

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    Brian Hopkins Port Tester:
    
    it mainly takes place as you gently ramp up the speed. The sbrick just hums away and as you lay on the speed the hum starts to dwindle.

    • February 5, 2015
  • 
    Jorge Pereira Please see https://social.sbrick.com/forums/topic/1/social-sbrick-com-technical-questions/view/post_id/835
    The hum noise comes from the motors (if you try with LEGO Power Functions Lights it should be silent). You can reduce it a bit with strong/heavy...  morePlease see https://social.sbrick.com/forums/topic/1/social-sbrick-com-technical-questions/view/post_id/835
    The hum noise comes from the motors (if you try with LEGO Power Functions Lights it should be silent). You can reduce it a bit with strong/heavy connections but the internals will always vibrate.  

    • February 5, 2015
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    Brian Hopkins nope. its the sbrick. I can put my ear right on it.

    • February 5, 2015
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    Jorge Pereira You are right.. I'm using right now one of my SBricks with LEGO PF Lights, tried several Duty Cycles and heard nothing but with a PF M Motor I can hear a high frequency noise with low duty cycles (when the M Motor doesn't spin).
    It also happens with XL...  moreYou are right.. I'm using right now one of my SBricks with LEGO PF Lights, tried several Duty Cycles and heard nothing but with a PF M Motor I can hear a high frequency noise with low duty cycles (when the M Motor doesn't spin).
    It also happens with XL and L motor, with the XL motor is almost un-noticed. I think is still related to the link above as it only happens with motors, not with LEDs - with low Duty Cycles, internal capacitors charge and discharge pretty fast to the motor but not to the LED, the LED maximum current is ~2 mA.
    Vengit also had a initial problem with the M motor because it use very high protection capacitors.  less

    • February 5, 2015
  • 
    Brian Hopkins I wonder if they can zero out some of the buzz by raising the minimum speed of motors. Could be changed in the APP.
    
    Right now I'm using the beta app for windows. It has some weird bugs buried in it.. But I will save criticism for the next release. It...  moreI wonder if they can zero out some of the buzz by raising the minimum speed of motors. Could be changed in the APP.
    
    Right now I'm using the beta app for windows. It has some weird bugs buried in it.. But I will save criticism for the next release. It still seems more stable than my dad's iPhone. Silly thing kept searching for my brick all the time.  

    • February 5, 2015
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    Jorge Pereira They can set a predefined threshold value but it changes from motor to motor (some 9V motors I've used don't even have a threshold) and it can also be different between motors of the some kind. So its difficult to preset a common value, should be left to the user.

    • February 5, 2015
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    Technicmaster0 . It depends as well on the load of the motor. As that it's probably impossible to find out whether the motor is still "blocked" or not.

    • February 5, 2015