Subject:
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Re: External supply for RCX
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 5 Sep 2000 22:14:40 GMT
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Original-From:
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Pete Sevcik <sevcik@flash.=nospam=net>
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Viewed:
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870 times
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The motor driver circuits in the RCX are current limited to somewhere around 500 mA
if I remember correctly.
The driver chips also have a temperature cutoff, so they will not overheat.
You can short the motor with no damage.
- pete.
Dean Husby wrote:
> Mario Ferrari wrote:
>
> > Steve Baker <lego-robotics@crynwr.com> wrote:
> > > "David C. Pyatt" wrote:
> > >
> > > > I've been using rechargable Eveready Renewals in one of my RCX's for • quite a
> > > > few months without any problems... I think it is the lower 1.2 volt • compared
> > > > to the 1.5V of a standard battery that they are concerned with.
> > >
> > > Yes - but alkaline batteries drop gradually in voltage throughout
> > > their lives - by the time they run out, their volts are below 1.2.
> > >
> > > NiCd's on the other hand stay at 1.2 volts and dry up much more
> > > suddenly...over just seconds sometimes.
> > >
> > > Dunno about those Eveready Renewals though - those aren't NiCd
> > > are they? I vaguely recollect them being some wierd "rechargable
> > > alkaline" technology - so they may be 1.5 volts.
> > >
> > > Anyway, most equipment that has to run on alkalines can cope with
> > > the slightly lower voltages that NiCd can supply - because it's
> > > the same as running on nearly expired alkalines.
> >
> > I regularely run my RCXs on NiMH Sanyo rechargable batteries and they works
> > very well. Voltage is lower, but they're much more current capable then the
> > alkaline technology ones.
> >
> > Ciao
> > Mario
>
> The only issue with the standard rechargeable ones is if the motor(s) short the
> resulting current drain could damage something. I'm sure we've all shorted a
> rechargeable and had the rubber wire casings melt off from the 'heated
> exchange'..
>
> 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
--
Pete Sevcik sevcik@flash.net
Techno-stuff Robotics
http://www.flash.net/~sevcik/
Robotics for FUN !
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Message has 2 Replies:
 | | Re: External supply for RCX
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| (...) If that is the case with rechargeable batteries, then I stand corrected. I do wonder why LEGO would caution the use of rechargeables if they are safe though... Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (URL) (25 years ago, 6-Sep-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: External supply for RCX
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| (...) The only issue with the standard rechargeable ones is if the motor(s) short the resulting current drain could damage something. I'm sure we've all shorted a rechargeable and had the rubber wire casings melt off from the 'heated exchange'.. (...) (25 years ago, 5-Sep-00, to lugnet.robotics)
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