Alt-BEAM Archive
Message #05238
To: beam@sgiblab.sgi.com
From: Steven Bolt sbolt@xs4all.nl
Date: Fri, 9 Jul 1999 11:45:39 +0200 (CEST)
Subject: Re: Something funny with the 1382 voltage triggers?
> > If your motor does well at low voltages, efficiency will be
> > increased if you use for instance a 2V (instead of 2.7V) trigger
> > level, or go even lower. You still get good performance, because
> > the voltage won't drop much and certainly not rapidly, while the
> > motor is running.
>
> Wrong, this totally ignores stiction and rolling friction. This is a myth
> of theorectical efficiency.
Also observed on my idler wheel equipped photovores.
> > That's five and a half components for a single SE, or eleven
> > for a double version. The 74HC221, all resistors, the 100N cap and
> > the driver are SMT, which means that weight and size will be mostly
> > determined by the solar panel and motor(s).
>
> A better solution would be to use a comparitor.
Fine! Do improve the idea. Note that the HC221 has a nicely low
quiescent power consumption.
> A monostable is a bad idea when efficiency matters Steven, I've
> tested it, and rejected it.
Whatever you say, Bob. I give up...
< Huge sigh of relief in the background >
Steve
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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