Subject:
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Re: use of single power source op amp circuits with the Handy Board
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 28 Feb 1997 18:30:58 GMT
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Original-From:
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Chuck McManis <cmcmanis@freegate.netIHATESPAM>
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Reply-To:
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cmcmanis@freegate.*Spamless*net
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Viewed:
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1514 times
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Nathan Marcantel wrote:
> Does anyone know how to get a negative 5 volts from the Handyboard
> for an op amp amplifier circuit or set equations to figure out
> the gain of a standard op amp as the 741 or LM339 using Vee as
> ground and Vcc as +5 VDC? The equations only seem to work when
> the power suppies are +- 5 VDC.
The text of your question suggests many possible answers, but I
would like to propose a couple of exploratory questions. More
importantly it would be useful to have some global state as to
what it was you were trying to do.
Anyway, you can't "get -5v" from the Handyboard, however you
can build a -5v power supply that is driven from the 9.6v
handyboard battery. MAXIM (www.maxim-ic.com) is a good source
of power converter chips that can provide a negative supply from
a positive input voltage.
A question for you is "How much current is the load on the op-amp
going to be using?" The +5v supply on the Handyboard can supply
about 100mA and your -5v supply will be able to supply this much
as well, but if you are amplifying something on the way out it
typically means you want to drive it with more power.
What are you driving with the op-amp? Did you know that there are
op-amps that work really well on a single supply ?
> Any suggestions? Help...
The OpAmp Cookbook, published by Sams Books. Available at many
electronics stores.
--
cmcmanis@netcom.com http://www.professionals.com/~cmcmanis
All opinions in the non-included text above are the sole opinions of
the author.
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