
This is a radio frequency (RF) and high voltage spike and
kickback protection circuit. It protects your power supply (high
voltage step up xfrmr) and low voltage house wiring.

X1 is the step up transformer. The center CORE is grounded to the
dedicated RF ground that also grounds SG1 (safety gap) and the
base wire of the Tesla secondary.

BC1 is a Bypass Capacitor. I use high voltage barium titanate
doorknobs, with stacks of four or more in series. A typical
rating for a single cap would be .003 microfarad @ 30 KVDC, and
using four of these caps in series I get .0007 microfarads at 120
KVDC. Since the AC rating is about half the DC rating on these
type capacitors, figure a series stack of four will withstand a
kickback of 50-60 KVAC in this use.

RFC 1A and RFC 1B are about 15-20 turns (minimum) of insulated
wire on a large iron powder core. I use 2" diameter iron powder
toroids to wind these chokes.

This circuit is not recommened for neon sign transformers unless
the value of BC1 is divided in two, and the center of the
capacitor stack is grounded with the xfrmr core. (SEE CHOKE1A)


  к------П
  |      |      X1                    RFC 1A
ФФ|ФФФФФФ|ФФФФФПКкФФФФФФТФФФФФФФФТФФФФяяяяяФФФ> TO TESLA TANK
  |      |     )К(      Г        Г
  |      |     )К(      Г        Г
  |      |     )К( BC1 ФСФ       O
  | LF1  УФЖ.  )К(     ФТФ       oФФЖ. SAFETY GAP
  |      |     )К(      Г        O
  |      |     )К(      Г        Г
  |      |     )К(      Г        Г
ФФ|ФФФФФФ|ФФФФФйКРФФФФФФСФФФФФФФФСФФФФФUUUUUФФФ> TO TESLA TANK
  |      |      Г                      RFC 1B
  Р------й     ЭЯЭ
               grnd

LF1 is a commercial heavy duty line filter wired in reverse.
Where current throughputs are high I use several in parallel.
Quality commercial line filters employ iron powder chokes, as
well as the "PC" capacitors of the circuit at the top of this
post. The Line Filters I use also have RF choke coils in the
ground path; the ground wire can be run reversed (it is neutral)
and can be used to trap stray RF, preventing ground path
contamination to the 60 cycle breaker box. I should note that I
use a minimum of two independent grounds. The core of X1, and
everything to the right of X1 in this diagram, is grounded
separately to a heavy, dedicated, RF ground. This heavy RF ground
is also used to ground the base of the Tesla secondary.

Note that the core of X1 is grounded. 

BC1 is a Bypass Capacitor. I use high voltage barium titanate
doorknobs, with stacks of four or more in series. A typical
rating for a single cap would be .003 microfarad @ 30 KVDC, and
using four of these caps in series I get .0007 microfarads at 120
KVDC. Since the AC rating is about half the DC rating on these
type capacitors, figure a series stack of four will withstand a
kickback of 50-60 KVAC in this use.

Where center tap ground type xfrmrs are used for X1 (such as neon
sign cores) BC1 must be divided into two units, and the center of
the stack must be grounded with the xfrmr core (see the arrange-
ment of PC1 and PC2 in the top most diagram). Use no more than
.001 or so microfarads per side, as too large a bypass capaci-
tance will create an oscillating current in the high voltage
windings on your step up xfrmr that will cause the xfrmr to fail.

RFC 1A and RFC 1B are about 15-20 turns (minimum) of insulated
wire on a large iron powder core. I use 2" diameter iron powder
toroids to wind these chokes.