Alt-BEAM Archive
Message #05814
To: beam@sgiblab.sgi.com
From: Sean Rigter rigter@cafe.net
Date: Sat, 21 Aug 1999 00:41:51 -0700
Subject: [alt-beam] Re: MOSFET sensor thingy
This circuit acts like what was described by Terry as a visual e-scope.
Putting the LED on the Source side works well cause it senses positive
and negative fields by turning on brighter or dimmer respectively. So
far it just provides a visual indication when there is a disturbance in
the e-field and not so easy to interface with logic levels.
regards
wilf.
Richard Caudle wrote:
> -----------------------------------------------------------------------
> Hi Ben, I'll take a whack at a simple
> scheme. LED
> 2N7000gnd------------------|<|---------source (pin
> 1) antenna-------------------------gate (pin
> 2) 3vdc-----------------------------drain (pin 3) Not many simpler.
> I later added a 3.3M resistor between the gate and V+. I made an
> E-vore using two of these and two pager motors (in series with the
> LEDs). I put a 4700uf cap on to store juice for the motors. It
> would be finished except I have no suitable solar cells to use. I may
> sojourn to Shadio Rack in the AM to get some of their
> solarcells. Richard Caudle
> richard@cqc.com
> Home ICQ - Frankendaddy
> -----------------------------------------------------------------------
> Guardians of the sacred words: Nee, Ptang, and NeeWhon!
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