From: Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
Sent: Monday, January 05, 1998 1:11 PM
Subject: Re: Variac
Thanks for the warning. I found their web site.
Could you take a look and see if anything about what they say leads you
to think differently, and if not, could you explain the reasoning behind not
using these devices in a TC tank circuit?
These are TRIAC dimmers, which work by varying the conduction
angle of the waveform. They are advertised as working with neon
transformers, which are inherently current-limited (unless you
resonate them with the tank capacitance). It would be worth trying
one with such a transformer, if you feel that you want to vary
the output of a neon transformer powered system. I suspect, though
I can't prove it, that they would cave in fast if you tried to use
one with a pole pig, which was how I interpreted the original post.\
In any event, they are a completely different form of beast from
a variable autotransformer, and nowhere near as rugged.