Re: DC Spark gap coils, why not current limit on the LV AC side?

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

Original poster: robert heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

Eric:  DC coil acts differently from an AC coil. When the gap fires a dc
short circuit is sent through the diodes to the filter cap power source
blowing the diodes. A simple solucion is to add a disconect coil just after
the diodes to isolate the diodes from the short circuit. A very low
inductance will not affect your circuit, but will protect the diodes.  I use
a high voltage coil made of  15 turns of house wire 1 inch dia and 6 inch
long air core with no coil form . quick and easy. For long term use I wind a
toroid coil of high voltage wire wound on a large toroid core such as the
ferrite core of a deflection coil of a TV monitor. Good luck
     Robert    H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Wed, 21 Jul 2004 07:18:05 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Re: DC Spark gap coils, why not current limit on the LV AC side?
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Wed, 21 Jul 2004 07:26:29 -0600
 >
 > Original poster: "S&JY" <youngsters-at-konnections-dot-net>
 >
 > Eric,
 >
 > I have solved to my satisfaction the problem of DC power arcing.  I use DC
 > resonant charging, with the inductor being about 200 mH.  The key is to
 > charge the tank cap through one set of gaps on a RSG, then use another set
 > of gaps to discharge the tank cap through the primary coil.  As the rotor
 > turns, this action repeats.  My RSG has 8 spinning electrodes and two sets
 > of stationary electrodes.  There is never a spark gap directly across the DC
 > power supply - resonant inductor - deQing diode, so there is no power
 > arcing.  Break rates can be as slow as you want.
 > --Steve Y.
 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, July 20, 2004 9:09 PM
 > Subject: DC Spark gap coils, why not current limit on the LV AC side?
 >
 >
 >> Original poster: "Hydrogen18" <hydrogen18-at-bellsouth-dot-net>
 >>
 >> I'm interested in the idea of DC Tesla coiling, and was wondering, why is
 >> it that you cannot simply put a ballast on the LV side of your 60 hz AC
 >> step up transformer and use that to prevent your rectifiers from blowing
 >> when the spark gap fires? I understand this would not allow for the
 >> doubling of the peak voltage of the capacitor like when a charging reactor
 >> is used on the HVDC output, but it seems like it would limit the current.
 > I
 >> guess the problem of rotary gap power arcing still exists when a ballast
 > is
 >> placed on the LVAC primary side of the transformer?
 >>
 >> ---Eric
 >>
 >>
 >>
 >>
 >
 >