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12v reverse speed control circuit diagram

  1. Jul 5, 2009 #1
    Hi

    I have a 9v motor (can run to 24v). I need to control the speed of the motor and reverse the direction. I also wanted to control it with a duel-potentiometer, but i cant seem to find any way to do this. can someone help with a circuit diagram please?
    (This is my first time building a circuit so any help you can offer please)

    Thanks
    Terence
     
  2. jcsd
  3. Jul 5, 2009 #2

    vk6kro

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    Science Advisor

    This shows a circuit that looks like what you need.

    http://www.dprg.org/tutorials/2005-11a/index.html [Broken]


    Note that the output is taken from pin 7 which is unusual but OK in this circuit. Pin 3 is normally the output of a 555.
    That would give you variable speed and you would need a Double pole double throw switch to change the polarity of the voltage getting to the motor to reverse its direction.

    100px-Crossover-switch-symbol.svg.png

    The motor would be on the right and the input voltage on the left in this diagram.
     
    Last edited by a moderator: May 4, 2017
  4. Jul 5, 2009 #3
    This National Semiconductor LMD-18200 full H-bridge offers full 3-amp 24-volt forward-reverse pulse width modulation w/braking.You can probably use the PWM to control different motor speeds in forward and reverse. You can also do it with diodes and pots on the output.
    http://acroname.com/robotics/parts/R27-18200.pdf [Broken]
    Tell us more about the motor rating.
     
    Last edited by a moderator: May 4, 2017
  5. Jul 6, 2009 #4
    Thanks for the help.
     
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