Alt-BEAM Archive

Message #08321



To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Fri, 17 Dec 1999 14:14:52 -0800
Subject: [alt-beam] Re: chloroplast




Thanks to Lee Golden, here is a long overdue 1381 Chloroplast SE which is
equivalent of the famous 34164 Chloroplast circuit. The trigger voltage can
be adjusted up to 7V (or more) and the reset voltage is determined by the
suffix letter. For example, a 1381J resets at about 2.9 - 3.0V. The 1381 CSE
comes in two versions, one for efficient low current motors and the other
for cheap and nasty motors. The first circuit is simple and works well with
BGmicro and other efficient motors. The second circuit can be used for both
efficient motors but also for high current toy motors using a super cap for
supply. These cheap but inefficient motors cause a big voltage drop on the
super cap from their high current requirement which can cause the 1381 to
reset. BTW this also applies to the chloroplast circuit. This problem is
avoided with a diode and cap for isolation and filtering at the 1381
detector input. For currents over 500ma, use a mosfet with a lower Rds(on)
than the 2N7000.

regards

wilf


<>

> -----Original Message-----
> From: Mike Kulesza [SMTP:mikekulesza@hotmail.com]
> Sent: Saturday, December 11, 1999 5:17 PM
> To: beam@sgiblab.sgi.com
> Subject: chloroplast
>
> So i need to make magbot as a gift for christmas... To make it using the
> chloropast SE, all i do is connect the coils to where the motors go, and
> put
> the magnets in? Are there any precautions with respect to a chloroplast
> magbot? How fast would it take to charge with a 2422 cell, 2200 uF cap, at
>
> 1300 hrs on a clear day in the sun?
>
> ______________________________________________________
>
"
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