Re: Low Voltage Tesla Coils

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
> 
> Tesla list wrote:
> >
> > Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <evp-at-pacbell-dot-net>
> 
> >         Schematics of several of the big Marconi spark transmitters (circa
> > 1910) showed the use of a cascade of two resonant transformers, with a
> > spark gap in the secondary of the first discharging a storage capacitor
> > into the primary of the second.  I've never seen a writeup on the
> > things, just schematics in the old books, and don't know why it was
> > done.  Perhaps a similar setup might work with TC's, and it wouldn't be
> > hard to simulate.  Terry?
> 
> I have seen this too. The reason was stated as being a "cleaner" output
> signal in the radio transmitter (?). It seems possible to make a system
> that would dispense with a power transformer in this way. The first coil
> would be used to produce a reasonably high voltage directly from low
> input voltage to charge the primary capacitor of the second coil.
> The operating frequency of the first coil must be lower than the
> one of the second coil, otherwise the same problem with inductance
> ratio appears.
> An old variation of the same thing (maybe what some of the old
> schematics really show) is an induction coil used to charge the
> primary capacitor of the Tesla transformer.
> 
> Antonio Carlos M. de Queiroz

	Both types of circuits are shown, and there certainly is a distinction
between them.  

Ed