Alt-BEAM Archive

Message #13452



To: beam@sgiblab.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Sat, 15 Apr 2000 17:16:20 -0500
Subject: Re: Solar powered pendulumn project


I've seen those. Nearly every major gas station near here (south MN) has
those things! I was impressed when I noticed that miniscule solar panel.

I felt like asking where they got it! :)


Dave Hrynkiw wrote:
>
> At 07:16 PM 4/14/2000 , Jeffrey D Spears wrote:
> >So I have in mind to build a Beam style solar powered pendulumn to
> >hang in my window. What I imagine is some sort of simple linear
> >motor--a magnet and big coil--delivering a little kick at the right
> >time. Once the appratus is built I can experiment with different
> >triggering methods, be it detecting the position of the pendulumn or
> >a resonate circuit tuned to the period of the pendulumn.
>
> Take a look at this little patent: 5488131
>
> It's a self-powered sign-waving device brought to our attention by Douglas
> Sasse. It's originally a Japanese patent dating back to '92, (from memory).
> Take a look at the patent, which is very large and detailed! It'll let you
> do what you want to with very little power. I'm really impressed by this
> design. It was found by Douglas as a lotto sign-waver at a local
> convenience store. Go figure, eh?
>
> It has a HUGE coil, mounted vertically on a PCB with 5 resistors 2
> transistors, and two electrolytic caps and 1 mica cap, powered by a tiiiiny
> Panasonic 2V 25x5mm calculator cell. The pendulum has a pair of magnets
> mounted so they have the coil pass between them every swing. Haven't spent
> the time analyzing the patent yet, but from first appearances, is a very
> elegant circuit. Something I would expect Wilf or Ben to come up with!
>
> This little pendulum works on obscenely low-light levels. Really an
> efficient design.
>
> Regards,
> Dave
>
> ---------------------------------------------------------------
> "Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_. Yes,
> that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
> 2 vowels. Pronounciation? _SMITH_".
> http://www.solarbotics.com

--


Richard Piotter The Richfiles Robotics & TI web page:
richfile@rconnect.com http://richfiles.calc.org

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13453 Sun, 16 Apr 2000 00:22:39 +0200 RE: 2N7000 MOSFET "Thomas Pilgaard" With the flat side facing you, pins downward the leftmost is the S
(Source) - the middle one is G (gain) and the rightmost is D (Drain).

The pin pointing !IN! on your schematic is S (source) which leaves the
middle one still the G and the remainder is D which has no arrow point
anywhere.

Cheers,

Thomas

> -----Original Message-----
> From: owner-beam@sgiblab.sgi.com [mailto:owner-beam@sgiblab.sgi.com]On
> Behalf Of BUDSCOTT@aol.com
> Sent: Saturday, April 15, 2000 9:49 PM
> To: beam@sgiblab.sgi.com
> Subject: 2N7000 MOSFET
>
>
> I just got some 2N7000 MOSFETs and have a question. I've got the
> three pins,
> S, G, and D. How do they corespond to the schematic?
> |---------- 2
> 1 ------|
> |<--------- 3
>
> Which is which?
>
> -Spencer
>
> <http://www.botic.com/users/beamstop>
>
> not a robot scientist
> not a college major
> not a grad student
> not a professor
> not a very organized person
> just Spencer (isn't that impressive enough?)
>

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