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Re: New Lab, Family Coil, 1st Light
Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Esondrmn-at-aol-dot-com>
In a message dated 5/14/01 10:45:23 AM Pacific Daylight Time,
I've heard strong disagreement to this in the past but I must say what I
believe. You are referring to the so-called equidrive configuration
where the two caps are each tied to opposite ends of the primary coil.
In both the 60Hz charging phase and the post-bang RF ringdown phase, the
primary circuit is a series configuration. Electrically, a series
circuit will behave the same regardless of what order the series
elements occur in. Like a flashlight with two D-cells, a switch, and a
bulb, it would work the same if the bulb were between the two D-cells.
This is Circuit Analysis 101, and these rules are inviolate and apply
equally to AC and DC circuits. Tesla coils are no exception.
There is nothing wrong with this configuration, it does appeal to one's
sense of symmetry, and it may or may not physically work out better
wire-routing-wise. But the components and electrons don't care either
I agree. Richard Quick Is the only coiler that I know of that built an
equidrive coil system. I believe he used two .10 ufd caps. His system
worked very well, I have video of it running. Twelve to fourteen foot arcs
if I remember correctly. He liked the set up. I have not seen evidence of
increased performance with this system over the single cap design. The
equidrive caps only need half the voltage rating but need to be twice the
capacitance. You also must remember to discharge the caps after every run as
the transformer secondary windings will not provide that function as it does
with a single cap.