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 18:47:25 GMT
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Viewed:
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653 times
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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
--
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Message has 1 Reply:
 | | Re: External supply for RCX
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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. (...) (...) (24 years ago, 5-Sep-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: External supply for RCX
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| (...) quite a (...) compared (...) 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 (24 years ago, 4-Sep-00, to lugnet.robotics)
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