Subject:
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Re: ** voltage dropping and current limitting**
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 27 Jan 1999 13:27:16 GMT
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Original-From:
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John Vaughn <vaughn@HWS.EDU>
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Reply-To:
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VAUGHN@HWS.spamcakeEDU
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Viewed:
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1101 times
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"Curt Mills, WE7U" wrote:
> On Tue, 26 Jan 1999 BMajik5127@aol.com wrote:
>
> > I have a 24 vdc supply, how can I drop the voltage to about 13 or 14 volts?
> > Would I use resistors across the supply? Or what???
> > Thanks in advance.
>
> Use an LM317T adjustable voltage regulator and 2 resistors. If you can't
> find a data sheet on it on the net somewhere, someone should be able to
> give you the formulas for figuring out the resistors. Find national
> semiconductor on the net and you should be able to find a datasheet there
> in .pdf format.
Look in an older edition of The Art of Electronics by Horowitz and Hill. They use
the LM317 as an example voltage regulator,
explain the resistor values, and provide a data sheet in the appendix. This is a
very useful reference book for all kinds of
electronics. Don't leave home without it.
John Vaughn
Dept. of Math/Computer Science
Hobart and William Smith Colleges
Geneva, NY
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