IC1 = NE555 TIMER
Q1 = IRF810 MOSFET
L1/L2/L3 = SEE DESCRIPTION
R1 = 20K OHM 1/4W RESISTOR
R2 = 2.5K - 47K 1/4 WATT POTENTIOMETER
C1 = 0.1uF DISC CAPACITOR
D1 = 12KV 500mA FAST DIODE (SEE OUR WEBSITE)
C2 = VALUE DEPENDS ON SPG1 VALUE...SEE NOTES BELOW
SPG1 = 300-1200VDC SPARK GAP (SPECIAL PURCHASE FROM PKUNLIMITED OR USE KRYPTON 85 SPARK GAP)

C2 VALUE:
CHOOSE A VOLTAGE BY SUBTRACTING 100VDC FROM THE VALUE OF SPG1
USE A CAPACITOR AT 5uF OR LESS.