Save thy transformer

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

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


Neon transformers are delicate.  The RF chokes serve to prevent the RF from
feeding back into the xmfr and destroying it in short order.  Use Terry
Fritz's excellent RF filter circuit --- see the archives.  It uses resistors
instead of chokes and works excellent.

Dr. Resonance





----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, August 09, 2002 4:57 AM
Subject: reason for rf chokes?


> Original poster: "Laurence Davis by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <meknar-at-hotmail-dot-com>
>
> I had an EE friend of mine interested in my coil.  when i drew up the
> schematic (at his request), he seemed confused by the chokes I use to
filter
> the high frequency from the tank circuit.
>
> I explained that due to the skin effect, the 200khz signal causes the
> secondary windings to overheat, thus the need for the chokes.  I'm
guessing
> here, but when the tank cap dumps its charge to the primary there is
voltage
> spike that returns several times during ring down.  This spike returns to
> the choke, which dampens the spike.  The choke is essentially transparent
at
> 60hz, but highly resistive to the 200khz signal.
>
> does the voltage return or is it a current spike?
>
> i thought it would be neat to connect a scope to the hv voltage side just
> after the choke and before the cap.  but i dont want to fry a nice scope
> soooo how about a faraday cage around the scope and optocoupled probe?
(like
> i could pull that design out of my hat or something!)
>
> so, how far off track am i?
>
> larry.
>
> _
>