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servo control via lpt problems

Discussion in 'Hobby Electronics' started by Mitch__, Mar 21, 2007.

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  1. Mitch__

    Mitch__ Guest

    Hi all
    i am working on a small project in VB, Controlling Servos by voice.
    everything is working great except for one thing.
    If i use one power adapter to control more than 1 servo, then
    following happens
    While 1 servo moves , second servo seems to get enough of a voltage
    fluctuation that it will move one way or the other.
    currently for this to work for me, i need to have a separate power
    supply for each servo, then
    everything works great.
    What do i need to make this work from one power supply?
  2. Mike

    Mike Guest

    Filter between the feeds to the two servos will also help, if its a PWM
    servo then even with one power supply with enough current, the Power supply's
    inherent output impedance may be too high for the servo's instantaneous
    draw, you might need to size a supply that has a continuous rating that is
    equal to the max instantaneous draw of *both* servos. If you are not sure than
    add lots of capacitors and maybe separate leg inductors and capacitors
    right next to the bridge driver for each servo...

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  3. Phil Allison

    Phil Allison Guest


    ** Any decent, regulated, 5 volt PSU with a few amps capacity.

    Not the puny unregulated ones you have.

    ........ Phil
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