Alt-BEAM Archive
Message #02874
To: Steven Bolt sbolt@xs4all.nl
From: Bob Shannon bshannon@tiac.net
Date: Sun, 02 May 1999 11:09:11 -0700
Subject: [alt-beam] Re: Easter egg hunt suggestions
Steven Bolt wrote:
>
> On Sat, 1 May 1999, Chiu-Yuan Fang wrote:
>
> > I thought the plan was to use batteries? The Sharp modules work
> > fine on battery powered platforms.
>
> To get a stabilized 5V, you end up with a 9V battery as the
> smallest source. I'd like to run my Egg Hunter on 3 or at most 4
> rechargeable cells, and I don't want to use a step-up converter.
> But the Egg Hunt as now defined makes use of the Sharp modules
> quite possible. Problem solved?
Going from a 9 volt cell down to 5 volts, even with a good low dropout
regulator is often much less efficient than using a small boost mode
switcher like those from Maxim, Linear Tech, and similar devices.
There are even inductor-less circuits that are excellent for BEAM use,
and
very efficient solarization.
But also remember that Sharp does make a 3.3 volt version of the IS1U60
series
detector, the only drawbacks may be in price and availability.
As 3.3 volts quickly replaces 5 volts, both of these will become less of
a factor with time.
I've got a .PDF file on-line a at work with the 3.3 volt detector info,
I'll try to dig that up for the list Monday.
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