Subject:
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Re: resistors w/motors?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 5 Feb 1996 07:55:06 GMT
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Original-From:
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Nathan Parker <ngparker@ucsd/NoMoreSpam/.edu>
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Viewed:
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1837 times
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At 1:43 PM 2/4/96, Jeffrey Keyzer wrote:>>
> > This would waste a great deal of power. At 9.6v, you should be able to
> > use a 5v regulator and possibly a few diodes to get the voltage down a
> > little lower.
>
> The problem with that solution is that the motors are driven
> bidirectionally - a regulator wouldn't work when the polarity it was given
> was reversed.
How about using some power zener diodes to drop the voltage:
|----[-power diode+]----[+zener diode-]------|
L293D ----| |------|
| |----[+power diode-]----[-zener diode+]------| |
| [motor]
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------------------------------------------------------------|
That way if you have a 6.0v zener, you'd get a (6.0+0.7)v drop,
yielding about 3.1v across the motor (asumming a 9.6v battery).
I haven't tried this, so don't blame me if your motor blows up.
-- Nathan
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