Alt-BEAM Archive
Message #05736
To: beam@sgiblab.sgi.com
From: Bruce Robinson Bruce_Robinson@bc.sympatico.ca
Date: Mon, 16 Aug 1999 18:52:44 -0700
Subject: [alt-beam] Re: MOSFET sensor thingy
> Richard Caudle wrote:
>
> Today at work, I came across a circuit for detecting electrostatic
> fields. ... The closer I moved my hand to the 'antenna', the higher
> the voltage went.
Sounds like you re-invented the Theremin, Richard. Actually, it WOULD be
interesting to play around with the anttenae portion of a theremin to
affect a robots behaviour.
Regards,
Bruce
5737 Mon, 16 Aug 1999 20:47:20 -0500 [alt-beam] Re: MOSFET sensor thingy beam@sgiblab.sgi.com Richard Piotter Interesting! Share your findings when you learn more! I'm interested in
what it detects, and is it omnidirectional, or can it be focused to scan
only one direction?
> Richard Caudle wrote:
>
> From: Richard Piotter wrote:
>
> > Interesting! What exactly is it responding to. will it detect a
> wall,
> > wood table leg, metal shelf, stack of papers etc? Obviosly, a hand
> > affects it, but what else?
>
> ----------------------------------------------------------------------
> Hi Richard (cool moniker),
>
> Right now it's just my hand and the coffeepot. I think that if I get
> a long enough antenna coil, I can use it to trigger a 74XX14.
>
> I tried to make one here at home with a 2N7000 from Motorola, but it
> didn't work. The one that I used has a double 's' thing on it...now
> that I look at it, maybe it's a upper case 'I' with a lower case 'i'
> inside. Not too sure of the maunfacturer. It seems that there's some
> reverse leakage in the mystery transistor, 'cause the motorola one
> dosen't work reversed.
>
> Anybody have any thoughts?
>
> Richard
> ----------------------------------------------------------------------
>
>
>
>
--
Richard Piotter
richfile@rconnect.com
The Richfiles Robotics & TI web page:
http://richfiles.calc.org
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5738 Mon, 16 Aug 1999 21:12:07 -0500 [alt-beam] Re: MOSFET sensor thingy "Richard Caudle"
Bruce Robinson
> Sounds like you re-invented the Theremin, Richard. <
What's a theremin?
Richard
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