Re: Converting something that runs on batteries...
From: sanjoealex (sanjoealex_at_yahoo.com)
Date: 07/31/04
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Date: 31 Jul 2004 08:52:09 -0700
"GaryH" <ghelfert@worldnet.att.net> wrote in message news:<RqUMc.135170$OB3.7090@bgtnsc05-news.ops.worldnet.att.net>...
> A good alkaline "D" cell has about a 14 amp-hr capacity. If the rocker can
> run 14 hours
> before it goes dead figure a current draw of 1 Amp.
> I would go with the 1.8 amp, 6V ac/dc adapter.
>
> "Greg" <ranger714@gmail.com> wrote in message
> news:32fa9d56.0407201407.40dc3355@posting.google.com...
> > deanbrnz@yahoo.ca (bigbossfan80) wrote in message
> news:<a86dc8c2.0407030514.1cb40006@posting.google.com>...
> > > I have a friend who recently had a baby. The baby always sleeps in
> > > this automatic rocking thingy that runs on 4 "D" batteries(6 volts
> > > DC). Because they use this thing at least 10 hours a day or more,
> > > they are going through batteries like crazy!
> > >
> > > I want to do him a favor and convert it so that it runs on regular AC
> > > power from a standard wall socket. I know that basically all I have
> > > to do is buy a '6 Volt AC-DC Adapter', cut the connector end off,
> > > strip some wire insulation from each end(+ and -), and wire it into
> > > where the "D" batteries connect, making sure I match the polarity etc.
> > >
> > > BUT, my only question is with regards to amperage draw. My local
> > > Radio Shack sells three different '6 Volt AC-DC Adapters', one is
> > > rated at 1800 mA, one is 800 mA, and the other is 300 mA. Is there
> > > someway that I can measure how many milli-amps this automatic rocker
> > > thing draws? I have a Digital Multi-Meter and ASSUME that I can
> > > somehow use it to measure the amperage draw, but am not 100% sure??
> > >
> > > Does anyone have any help or suggestions?
> > >
> > > THANKS!:)
> >
> >
> > I've actually had the same idea with the baby swing we use with my
> > 4-month-old daughter, but i've also been looking around at maybe a
> > larger 6-volt battery that could run for weeks, and possibly recharge
> > off of a seperate charger while the baby sleeps in her crib.
> >
> > Of course, we use her swing about an hour a day, but i've heard of
> > some babies who just can't sleep in bassinets or cribs, but will sleep
> > in a swing. Glad that isn't us.
> >
> > Also, the spring-loaded, wind-up type of swing generally last only
> > about 5 minutes or so, and the ratcheting winder was painfully loud...
I can't just understand the doubt you have regarding the ampere value
the digital multimeter shows. U can safely measure the current drawn
by the battery and use an adaptor suited for that purpose.
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