Re: resonant freq.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <DR.RESONANCE-at-next-wave-dot-net>


No, nothing wrong.  Your technique is another valid and clever way of doing
it.  We just always used the "antenna" approach and it seems to work well
for us.

Best regards,

Dr. Resonance

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, July 10, 2002 5:47 PM
Subject: Re: resonant freq.


> Original poster: "Sean Taylor by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<taylorss-at-rose-hulman.edu>
>
> Is there something wrong with this method:
>
> Inject a signal into the bottom of the secondary through a 1 KOhm
> (about) resistor, and monitor the voltage at the bottom of the
> secondary (after the resistor).  When this voltage goes to a minimum,
> you have reached resonance, in other words, the voltage across the
> resistor is at a maximum, thus current is at a maximum.  Am I missing
> something here?  Thanks,
> Sean Taylor
>
>
>
> -------------------
> > Original poster: "Malcolm Watts by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
> >
> > Hi D.C.,
> >
> > On 7 Jul 2002, at 12:49, Tesla list wrote:
> >
> > > Original poster: "D.C. Cox by way of Terry Fritz
> <twftesla-at-qwest-dot-net>"
> > <DR.RESONANCE-at-next-wave-dot-net>
> > >
> > >
> > > Inject a signal into the bottom of the secondary coil and then,
> using a
> > > scope probe, hold a small 4-5" long piece of wire near the top of
> the coil's
> > > toroid --- 1-2 in. away but NOT TOUCHING the sec. coil  This
> antenna will
> > > pick up the signal and give you the resonant freq on the scope.
> You could
> > > also just use a 5 meg resistor between the scope probe and the
> toroid.
> > >
> > > The lowest freq you can find will be the resonance point.
> >
> > I'd say that a couple of inches away from the terminal is far too
> > close to give an *accurate* figure (unless the coil is going to be
> > that close to something else while running) and 5MOhms is too much
> > loading. I suppose it depends how accurate you want to be. I
> normally
> > won't have a probe closer than 3 feet (or more if I can get a
> > readable signal).
> >
> > Regards,
> > malcolm
> >
> >
> >
> >
>
>
>
>