DOUBLER SCHEMA
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variac: 220 V / 0-250 V, 9 A
F: fuse 220 V @ 16 A
MOT: 220 V ? 2200 V @ 1 kW
C1, C2: two big foil-paper caps 1 uF @ 6.3 kV each, connected in parallel for a 2 uF capacity
D: string made with 22 diodes 1N4007 (1 kV @ 1 A) in serie