Subject:
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Re: reverse ploarity circut protection??
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 14 Jul 2006 14:04:03 GMT
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Reply-To:
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danny@!ihatespam!orionrobots.co.uk
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Viewed:
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2877 times
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On 13/07/06, Ross Crawford <ross.{mylastname}@gmail.com> wrote:
> In lugnet.robotics, Ondrew Hartigan wrote:
> > hey electronic wizards,
> >
> > i am working on a new lego project to rid the new IR train electronics from
> > the bulky train base and i'm looking to build a circut protector for it.
> > since i am planning on using standard lego conections 2x2x 2/3rds this is
> > very important. if anyone has a solution i would greatly appreciate it.
> >
> > thanks, ondrew
> >
> > <<http://www.brickshelf.com/gallery/roj2323/ideas/ir-circuit-protector.jpg>>
>
> A bridge rectifier would work, very simple, but I'm not sure it's the best
> solution.
>
> ROSCO
A bridge may be the only solution, but you will loose 1.2v across the
diodes generally. Although it needs work (and is incomplete) I wrote a
tutorial on interfacing a simple LED with an RCX, which shows ways
using a bridge, or just simply polarising it to prevent damage. There
is also a page on the diode bridge itself, which will explain a little
more on how they work.
http://orionrobots.co.uk/tiki-index.php?page=Diode+Bridge
http://orionrobots.co.uk/tiki-index.php?page=Interfacing%20an%20LED%20to%20an%20RCX%20Port
Cheers,
Danny
--
Danny Staple MBCS
OrionRobots
http://orionrobots.co.uk/blogs/dannystaple
(Full contact details available through website)
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