Subject:
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RE: How do I limit current effectively?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 10 Aug 1998 03:38:48 GMT
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Original-From:
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Joe Martin <joema@mpx.com.au[nospam]>
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Viewed:
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1475 times
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That may be fine, I'm not really very well versed electronically but when
doing something similar I had worried that a resistor would reduce the
voltage. That might be ok in this situation.
Joe Martin
> -----Original Message-----
> From: Chuck McManis [mailto:cmcmanis@freegate.com]
> Sent: Monday, 10 August 1998 12:12
> To: Joe Martin
> Cc: handyboard@media.mit.edu
> Subject: Re: How do I limit current effectively?
>
>
> Why not use a 12ohm 10watt power resistor instead?
> --Chuck
>
>
> Joe Martin wrote:
> >
> > National Semiconductor make an "LM317" 3 terminal adjustable • regulator which
> > can easily be used as a current limiter. I am not sure if the • schematic for
> > this particular application is included with the Data sheets so • I'll add it
> > here.
> >
> > Current Limiter
> >
> > ________________ R1
> > Vin |LM317|___/\/\/\_________Iout
> > |_____|Vout |
> > | |
> > Vadj|____________|
> >
> > Iout = 1.25/R1 where I is the output amperage
> >
> > Joe Martin
> >
> > > -----Original Message-----
> > > From: Phil [mailto:thehahns@netwurx.net]
> > > Sent: Sunday, 9 August 1998 11:52
> > > To: handyboard@media.mit.edu
> > > Subject: How do I limit current effectively?
> > >
> > >
> > > I have 2 large motors that draw about 2 amps. They are powered by
> > > a battery
> > > that's 6v at 2amp. How can I limit the motors so that they can
> > > only draw 1/2
> > > amp?????
> > >
> > > I know on my first robot (ahh, fine memories of burning • resistors), I just
> > > made a bank of resistors, but that got extremely hot and • melted the nearby
> > > electrical tape and even softened the LEGO piece it was on. • What method
> > > would be better?
> > >
> > > thanks!
> > > phil
> > > thehahns@netwurx.net
>
>
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