Re: Transformerless Tesla coil

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

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: "Jolyon Vater Cox by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
> 
> Antonio,
> with regard to powering either the directly -coupled transformerless- or
> capacitive-transformer tesla coils from both sides of a centre tap-grounded
> HV transformer  as opposed to a single-end grounded HV supply
> would making L1 a trifilar wound air-cored balun be any use in fulfilling
> this objective?

This would fall in the problems of a magnifier and severe insulation
problems. It's simpler to split C1 in two:

                           (=====)
                              | 
                              L2
                              |
   +  o------+--2C1--+--------+
             o       |        
 PSU        gap      L1       
             o       |        
   -  o------+--2C1--+--------o Ground

If C1 is an MMC, just split it in two, as the voltage over the two
capacitors reduces to one half with this connection. The NST may not
like much this connection, because when the gap fires one half of the 
RF oscillation appears in common mode at both its terminals.

Antonio Carlos M. de Queiroz