Subject:
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Re: Is an RCX Output Amplfier, possible ?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 9 Feb 2001 03:28:58 GMT
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Original-From:
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Tim Hatch <vbq@SAYNOTOSPAMmyrealbox.com>
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Viewed:
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1346 times
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You can run about 2 motors off of one output (as the RCX goes into thermal
shutdown at 500ma and each motor will (on average) draw 200ma at a stall).
Sorry I can't help you with the device part, but (don't let this start
flames) can't you just hook up a power transistor with a heatsink and a
power source?
Tim
----- Original Message -----
From: Ralph Hempel <rhempel@bmts.com>
To: <lugnet.robotics.rcx@lugnet.com>
Sent: Thursday, February 08, 2001 7:24 AM
Subject: RE: Is an RCX Output Amplfier, possible ?
> I think John Barnes has designed such a beast. John, maybe you can
> answer here?
>
>
> > -----Original Message-----
> > From: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com]On Behalf
> > Of Xanthra47
> > Sent: Thursday, February 08, 2001 12:09 AM
> > To: lugnet.robotics.rcx@lugnet.com
> > Subject: Re: Is an RCX Output Amplfier, possible ?
> >
> >
> > Dean,
> > Your motor multiplexer is cool, but not really what I'm
> > after. What I
> > need is a way to have a single output drive several motors in the same
> > direction at the same time (IE Hook them all up in parallel.)
> > After reading
> > some of the posts here and thinking about the fact that the RCX only • uses
> > AA's it's clear that I don't want to run 4 motors off of each of the 3
> > outputs. Even if it didn't hurt the RCX, the motors wouldn't get
> > much juice
> > : ( What I think I really need is a current amplifier that can
> > switch fast
> > enough that I don't lose the PWM signals. Is there such an animal ?
> > Thanks,
> > Xanthra47
> >
> > "Dean Husby" <nntp@akasa.bc.ca> wrote in message
> > news:3A80DCE1.FAB41EE9@akasa.bc.ca...
> > > http://www.akasa.bc.ca/tfm/lego_ms2.html
> > >
> > > Gives you 6 outputs from 3.
> > >
> > > Dean
> > > --
> > > Coin-Op's For Sale!: http://www.akasa.bc.ca/tfm/coin-op.html
> > > Dean's Lego Workshop: http://www.akasa.bc.ca/tfm/lego_wr.html
> > > Vancouver Lego Club: http://www.akasa.bc.ca/vlc
> > >
> > >
> >
>
>
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Message has 1 Reply:
 | | Re: Is an RCX Output Amplfier, possible ?
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| (...) Actually, you need four transistors in what is called an H-bridge configuration. This is due to the fact that the motors are usually intended for bi-directional use. If you are only using them in one direction, a single transitor will suffice. (...) (26 years ago, 12-Feb-01, to lugnet.robotics)
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