Alt-BEAM Archive
Message #05522
To: beam@sgiblab.sgi.com
From: "Andrew Miller" amiller@golden.net
Date: Mon, 2 Aug 1999 09:35:22 -0400
Subject: [alt-beam] Re: Maxxim chip doubler...
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From the "I thought of it First!" files....:-)
Maxxim makes a lovely little Voltage doubler MX7660 ... two
suport Capacitors is all it needs...up to 96% efish at low
current levels... used mostly for creating the needed + - 5V
for LCDs...
attached is a pic of a Photovore dated May 1994 (Yeesh I've been
doing this WAY too long) that used ther 7660 and a modified HBS
solar engine. (please excuse the dust it's been on a shelf for a
LONG time)
the theory was this...(arcaic tech alert!)
HBS is a time based SE and the HBS works down as low as .8V but
will fire a SE as low as 1.1V but the pager motors don't really
do anything useful until 2V so in low light levels the HBS
engine was firing away and the bot wasn't going anywhere.
So add the 7660 in and run the HBS on the Grnd to +V and run
the remainder of the SE (including power cap) on -V to +V so by
the time the HBS sees 1.1V the rest of the SE has 2.2 V waiting
to go...
actually worked pretty good...
It's My first ( and _ThE_ first as far as I know) to run in
Flourecent office lighting...
Bear in mind this was WAY before the favorite Sunceram cells
were available and the 1381 was discovered.
all4nw
Attachment: VDP.jpg
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