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servo control via lpt problems

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. so 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? TIA Mike

Reply to
Mitch__
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Try larger power supply (more current).

Without the schematics i is difficult to say if controlling one servo will affect the other one.

Rudolf

Reply to
Rudolf

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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Regards
Mike
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Reply to
Mike

"Mitch

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

Not the puny unregulated ones you have.

....... Phil

Reply to
Phil Allison

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