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Re: Weird Magnifier output
Hi Dwight,
The following may help:
TRIPLE RESONANCE PULSE TRANSFORMER CIRCUIT
F. M. Bieniosek
Review of Scientific Instruments 61,(6), June 1990
+ACI-1. INTRODUCTION
Circuits for pulse charging high voltage pulse forming lines (PFL)
are generally based either on a Marx generator or on a pulse
transformer. Pulse transformer driven circuits are typically designed
to operate as a Tesla, or double resonance circuit. When the circuit
is tuned to resonance, energy is efficiently transformed from an
energy storage capacitor to the PFL. However, the simple equivalent
circuit model for a Tesla transformer neglects the internal
capacitance of the transformer. The presence of the additional
capacitance in the circuit can significantly affect circuit operation.
A modified circuit design that takes into account the internal
capacitance was patented in 1989.
.............................................
(in a three coil system) A resonant condition may be found at which
100+ACU- of the energy initially stored in the capacitor C1 is transferred
to the capacitor C3. The circuit becomes resonant if the voltages v1
and v2 and their time derivatives dv1/dt and dv2/dt, are zero when the
PFL (essentially a capacitive load for C3) voltage v3 reaches its
peak. THIS CAN ONLY OCCUR WHEN THE NORMAL MODE FREQUENCIES (I.E.,
PRIMARY SYSTEM, SECONDARY BY ITSELF, AND EXTRA COIL WITH TOROID) ARE
IN THE RATIO OF WHOLE NUMBERS..............................THE TWO
SIMPLEST RESONANT MODES, WHICH ARE ALSO THE MODES OF GREATEST
PRACTICAL INTEREST, ARE THOSE IN WHICH THE THREE NORMAL MODE
FREQUENCIES OF THE COUPLED CIRCUIT ARE IN THE RATIOS 1:2:3 AND
1:2:5.................................................................
..............................
(My interpretation.)
-----Original Message-----
From: Tesla List +ADw-tesla+AEA-pupman-dot-com+AD4-
To: tesla+AEA-pupman-dot-com +ADw-tesla+AEA-pupman-dot-com+AD4-
Date: Wednesday, December 16, 1998 6:08 AM
Subject: Re: Weird Magnifier output
Original Poster: Terry Fritz +ADw-twf+AEA-verinet-dot-com+AD4-
Hi Dwight,
Check a few things...
1. Be sure the scope is well grounded on a different ground and
circuit
than the coil. In other words be sure it isn't picking up noise
through
the AC or ground wiring.
2. Be sure the input signal is within the measurement range. If the
input
amplifiers on the scope are clipping the signal, all kinds of funny
things
will be seen which are not really there.
3. How are you picking up the signals? You +ACI-should+ACI- be using some
kind of
50 ohm radio (CB, scanner, cell phone, etc.) antenna. That antenna
needs a
50-ohm terminating resistor at the input to the scope (that scope may
have
this function built in if it hasn't been fried. Check through that
scope's
zillions of menus and check it with an ohmmeter). If you just hang a
wire
on the end of a scope probe, the probe circuit will ring and cause
strange
things to be seen. The antenna setup mentioned will be properly
terminated
and balanced and will not have unwanted harmonics bouncing around in
the
cables and such from the coil's impulses.
4. Short the scope's input and be sure the signals disappear. If they
are
still there with the input shorted, well.... :-)
5. The scope's sampling rate and the intermittent pulse nature of the
coil
may be confusing the scope's FFT function. If that is the case, there
is
probably some work around but problems like that make my brain hurt
:-))
6. If the arcs are striking ground, you may be seeing some harmonics
from
the current discharges. Also, the spark gap may be putting out
powerful RF
noise too. Just have to play around with it to see if these are the
cause.
That's my list of things digital scopes and Tesla coils do to mislead
their
masters+ACE- :-)
Good luck+ACE- Sounds like your are doing some really neat testing
there+ACEAIQ-
Terry
terryf+AEA-verinet-dot-com
At 08:21 AM 12/15/98 -0500, you wrote:
+AD4-
+AD4-
+AD4-Hello All,
+AD4-
+AD4- I finally got my magnifier working but I got unexpected spectral
+AD4-outputs. The scope that I have on lone is a Tektronix TDS 460 that
does
+AD4-Ft's. Using a 0.08uf cap and appx.30 uH of tapped inductance on the
+AD4-primary of the RF transformer( the 30 is just a guess, I calculated
it and
+AD4-measured it but I have sense forgotten it while writing this post) I
got
+AD4-strong hot discharges from the resonator to the ceiling which is the
+AD4-closest ground. I can not see the full output due to this problem of
close
+AD4-quarters in the basement. With the 5KVA pig, moving it around now is
+AD4-impossible to do by myself. Anyway, the FFT showed three peeks+ADs- one
at 140
+AD4-KHz and 370 KHz and a braud one ate 560 KHz. The latter being the RF
+AD4-transformer. About a month ago I posted the specs of the system.
Well in
+AD4-a magi system you want to tune the RF transformer to the resonance of
the
+AD4-resonator which in this case is 200 KHz. When I tried and succeeded
in
+AD4-getting peek at 200 KHz I got no out put and the safety gaps fired
frequently.
+AD4- Obviously the system wants to run at the 140 KHz mode. By
connecting
+AD4-up the RF transformers secondary to the bottom of the resonator is
dropped
+AD4-the resonant frequency of the resonator. Is this right? Any input
is
+AD4-appreciated.
+AD4- I am getting good quenching with a 12+ACI- dia. rotory and a 8 stage
series
+AD4-blown quench gap. After 1 and 1/2 periods it quenches. A clear
envelope
+AD4-is seen.
+AD4-
+AD4- Thanks for any comments that may help in clearing this confusion
up for
+AD4-me.
+AD4-
+AD4-Dwight
+AD4-
+AD4-