----- Original Message -----
From: "Marcelo Puhl" <mark@CPOVO.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, January 21, 2003 5:10 PM
Subject: [PIC] Re: Anyone tried running a PIC with RF-energy ?


>
> Pleas see the attached file.
>
> On 21 Jan 2003 at 15:17, Kyrre Aalerud wrote:
>
> > Update:
> >
> > I get sooooo little power out of my experiment that voltage over the
> > capacitor actually goes down while I measure it!  My voltmeter is a CHY
17
> > from ELFA. (www.elfa.se)
> > It's DC impedance is only 10 Mohm so i'm not surprised...
> >
> >     KreAture
> >
> >
> > ----- Original Message -----
> > From: "Olin Lathrop" <olin_piclist@EMBEDINC.COM>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Tuesday, January 21, 2003 2:12 PM
> > Subject: Re: [PIC]: Anyone tried running a PIC with RF-energy ?
> >
> >
> > > > I set up a 3-4 meter wire around a room, and connected another wire
to
> > > > ground.
> > > > Then I made myself a little 4-way rectifier with 4 small-signal
diodes.
> > > I
> > > > connected the outputs to a capacitor and the inputs to the two
wires.
> > > >
> > > > Later I found out I needed something to connect to the capacitor,
and
> > > > decided on a push-button and a led with series resistor.  After
> > > soldering
> > > > wires to the cap in one end, i took a bite of the other end to get
the
> > > > insulation off.   I got a bit baffled because it really hurt!!!  I
got
> > > > shocked!  Pulling out my trusted DVM I measured 78 volts across the
> > > > capacitor.  No wonder it hurt!
> > >
> > > This doesn't sound right.  I bet you were capacitively picking up
power
> > > line noise from your house, not RF unless you happen to be next door
to a
> > > transmitter.  78V sounds way out of line for raw voltage from an
antenna
> > > without even a resonant circuit.  I used to have a crystal radio
connected
> > > to a 20 meter antenna.  The strongest station was 50KW at 1.03MHz
about 20
> > > miles away.  This of course did have a resonant circuit, and the open
> > > circuit output was a few volts.  The power was sufficient to drive a
pair
> > > of headphones (the old fashioned high impedence kind) to reasonable
> > > volume.
> > >
> > >
> > > *****************************************************************
> > > Embed Inc, embedded system specialists in Littleton Massachusetts
> > > (978) 742-9014, http://www.embedinc.com
> > >
> > > --
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> > >
> >
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>
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