Date: Thu, 07 Mar 2002 09:28:47 -0600

Author: Cliff Bettis

Subject: Re: Variac

Post:

Jerry,

The dimmer is very light and portable but it won't go above the line
voltage; it also distorts the waveform; it won't handle quite as much power
(at least the one I use). The dimmer is a whole lot cheaper than a variac.
My dimmer is mounted in an aluminum mini box with a small meter and a
switch. I use the dimmer to control blower motors for air tracks and air
tables, for current control for filaments in beam tubes, for color mixing
using old slide projectors. I use the variacs for my bare filament spectral
source; jumping rings, Tesla coil.

Cliff

----- Original Message -----
From: "Gerald Zani"
To:
Sent: Thursday, March 07, 2002 9:10 AM
Subject: Re: Variac


> The circumstances being the power required? The dimmers being used for
low
> power applications? JZ
>
> At 08:53 AM 3/7/2002 -0600, you wrote:
> >Yep,
> >
> >Actually, I use both depending on circumstances.
> >
> >Cliff
> >
> >----- Original Message -----
> >From: "Gerald Zani"
> >To:
> >Sent: Thursday, March 07, 2002 8:27 AM
> >Subject: Re: Variac
> >
> >
> > > Tapper,
> > >
> > > Does anyone use a new solid state dimmer control to replace a
traditional
> > > variac?
> > >
> > > Jerry
> > >
> > >
> > > At 08:16 AM 3/5/2002 -0600, you wrote:
> > > >I don't know which "previous poster" Paul is referring to, but to be
on
> >the
> > > >safe side I want to remind everyone that our "What's It Take To Shock
> >You?"
> > > >exhibit at The Science Place has a 20 kilohm current limiting
resistor in
> > > >the output circuit of the variac. I described this in my message. One
> >should
> > > >never play with variacs without such a safety device in place.
> > > >
> > > >poj
> > > >
> > > >----- Original Message -----
> > > >From: "Paul Nord"
> > > >To:
> > > >Sent: Monday, 04 March, 2002 17:00
> > > >Subject: Re: Variac
> > > >
> > > >
> > > > > I think that the previous poster intended to warn you about
dangerous
> > > > > CURRENTS, not voltages. The variac is regulating the voltage.
But
> >the
> > > > > only regulation on the output power is the 20 Amp breaker in your
> >fusebox.
> > > > > That limits you to 110V X 20A = 2200W. So, if you dial your
variac
> >down
> > > > > to 1 volt you might be able to draw 2200W / 1V = 2200A of current.
> > > > > However, that's an upper limit. You'd probably loose a lot in the
> > > > > transformer itself. But even 10% of that is a big current.

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