Alt-BEAM Archive

Message #03131



To: beam@corp.sgi.com
From: Steven Bolt sbolt@xs4all.nl
Date: Mon, 10 May 1999 11:14:54 +0200 (CEST)
Subject: [alt-beam] Re: SMD SE


On Mon, 10 May 1999, Dave Hrynkiw wrote:

[ If they are in direct light then they dont fire. ]

> We've seen this with the prototypes to the SunDancer. The solarcell is
> generating enough power to keep the SE latched on, and it isn't resetting
> (that's why we use the 2422 in that kit). One method is to use a smaller
> solarcell, another is to put a parallel resistor on the coil (say, 10 to 47
> ohms perhaps), and yet another is to put a similar resistor in series with
> the solarcell itself.

Wouldn't it be more elegant to trigger a monostable, instead of a
latch with an off-level? That way you get a timed pulse, and reset
would be achieved if the voltage dropped enough to unset the 1381,
instead of all the way to 0.7V or so.

Best,

Steve

----------------------------------------------------------------------
# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
----------------------------------------------------------------------




------------------------------------------------------------------------
eGroup home: http://www.eGroups.com/group/alt-beam
http://www.eGroups.com - Simplifying group communications

Home