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Thread: Quick hall effect sensor + mosfet conversion to sg wheel

  1. #1

    Quick hall effect sensor + mosfet conversion to sg wheel

    decided to try out hall switching before my next build so i grabbed the junk box and pulled apart some fans and got the hall sensor out and connected them to a mosfet driving an SG bike wheel.
    seems to work as i expected, needs an astable, pulse width is quite long, charging seems good but the battery is pretty dry and sulphated.

    http://vid936.photobucket.com/albums...ps223c2aff.mp4

  2. #2
    Senior Member Ed_Morbus's Avatar
    Join Date
    Aug 2012
    Location
    Netherlands, The Hague
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    112
    Thanks for sharing

    Have you schematic ?

  3. #3
    mosfet sg.JPG

    it needs a timer to change the pulse width, and an opto isolator if you are going to run higher than 12 - 14v

  4. #4
    mosfet sg monostable.JPG

    circuit i will build next. one with resistors before holding pin 2 high is correct
    Attached Images Attached Images
    Last edited by bigmotherwhale; 09-02-2014 at 02:38 AM.

  5. #5
    Senior Member Ed_Morbus's Avatar
    Join Date
    Aug 2012
    Location
    Netherlands, The Hague
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    112
    Thank you for your time

  6. #6
    Hi BMW,

    Quote Originally Posted by bigmotherwhale View Post
    decided to try out hall switching before my next build so i grabbed the junk box and pulled apart some fans and got the hall sensor out and connected them to a mosfet driving an SG bike wheel.
    seems to work as i expected, needs an astable, pulse width is quite long, charging seems good but the battery is pretty dry and sulphated.
    I rigged mine up with two hall switches in series on separate adjustable mountings. This allows me to adjust both the timing and pulse width mechanically without using a 555 timer circuit. It seems to work best at about 20 percent on time. I use a small signal transistor in the base circuit of the 21194 power transistors.
    Last edited by Gary Hammond; 08-22-2018 at 01:52 PM. Reason: change percent sign to word
    Gary Hammond,

  7. #7
    good idea, also using 21194 seems like a good plan, i will see how long my mosfets hold up.

  8. #8
    Any chance that some one could post the bedini SG schematic with a hall switch substituted for the trigger wire, I would like to see the difference but don't quite know how to do that.


    [QUOTE=Gary Hammond;16842]Hi BMW,

    Quote Originally Posted by bigmotherwhale View Post
    decided to try out hall switching before my next build so i grabbed the junk box and pulled apart some fans and got the hall sensor out and connected them to a mosfet driving an SG bike wheel.
    seems to work as i expected, needs an astable, pulse width is quite long, charging seems good but the battery is pretty dry and sulphated.

    QUOTE]

    I rigged mine up with two hall switches in series on separate adjustable mountings. This allows me to adjust both the timing and pulse width mechanically without using a 555 timer circuit. It seems to work best at about 20 percent on time. I use a small signal transistor in the base circuit of the 21194 power transistors.

  9. #9
    Hi Brian,

    Give me a few days and I can post a schematic of what I did. I'm currently away from home on a mini vacation and posting this from a motel room using my wife's laptop.

    cheers,
    Gary Hammond,

  10. #10
    Thank you, hope you have a nice vac.

    Quote Originally Posted by Gary Hammond View Post
    Hi Brian,

    Give me a few days and I can post a schematic of what I did. I'm currently away from home on a mini vacation and posting this from a motel room using my wife's laptop.

    cheers,

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