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Re: [TCML] mot questions
If you really do want a table top, portable TC, stick with a 12/30 nst as a
power source. The MOTs are heavy, usually two required, and two ballasts
also required. Nothing light or simple about this setup. A 12/30 with
spike filter is a reasonable weight for a light tabletop unit.
JAVATC will allow you to experiment with all coil parameters so you get it
absolutely right on the very first try. Amazing program, and it's free.
Dr. Resonance
Resonance Research Corp.
www.resonanceresearch.com
----- Original Message -----
From: "Neal Namowicz" <neal@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Friday, November 30, 2007 7:19 PM
Subject: Re: [TCML] mot questions
Let me explain why I've asked these things. I guess I'm kind of working
backwards, in a way. I've already made a couple of "medium" sized coils
using nst's, and those worked out fairly well for me. (Gotta do a little
more work to improve my toploads) Now I want to down-size and make a nice,
small relatively simple table top model. I want to keep it simple and as
"silicon-free" as possible. That, and I have lots a mots piling up, just
begging to be utilized somehow :) And, I want something with a decent
current for jacob's ladders. With that in mind, let me ask a couple more
questions-
Is it logical to assume that if I use a larger mot to ballast a smaller
one, I'll have better current limiting?
Ignoring the weight/size factor, could I use 2 mots to limit one? If so,
do I go series or parallel?
I didn't realize that dimmers are solid state devices. If I can dig up an
older one, were those simple rheostats, hence eliminating the choppy
waveforms?
These days I tend to ask more questions and/or research something as best
as possible, rather than forge blindly ahead like some years ago when I
first got my hands on a mot. I set up a spark gap, hooked up a fairly
large cap, and connected it straight to line voltage. "WOW, look at the
great sparks! Oops, why'd the lights go out? Is smoke supposed to come out
of the transformer?" True story. Live and learn. I'm putting more emphasis
on the live part now. Thanks again for your help and answers,
Neal.
A shorted MOT ballast draws a ton of current. I have
a small one with a shorted secondary that draws 17A
and runs hot as pistol. It is barely usable. Most
other MOTs I've tried draw too much current for a
15-20A household circuit breaker. I once used a
matched pair of kilowatt-class MOTs as a 240vac
ballast for a pole pig. With both secondaries
shorted, they drew 20A from my 40A garage outlet and
powered up my 5kva pole transformer pretty
efficiently.
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