Version 4 SHEET 1 2336 704 WIRE 1520 -112 1472 -112 WIRE 1680 -112 1600 -112 WIRE 1792 -112 1680 -112 WIRE 1792 -64 1792 -112 WIRE 1680 -48 1680 -112 WIRE 1680 -48 1600 -48 WIRE 2048 -48 1840 -48 WIRE -64 0 -144 0 WIRE 80 0 16 0 WIRE 336 0 160 0 WIRE 720 0 336 0 WIRE 1168 0 720 0 WIRE 1328 0 1248 0 WIRE 1472 0 1472 -112 WIRE 1472 0 1408 0 WIRE 1984 0 1840 0 WIRE 720 32 720 0 WIRE 144 80 144 48 WIRE 208 80 144 80 WIRE 1792 80 1792 16 WIRE 2048 80 2048 -48 WIRE 1232 96 1232 48 WIRE 208 144 208 80 WIRE 1600 144 1600 -48 WIRE -144 192 -144 0 WIRE 208 208 208 144 WIRE 336 208 336 0 WIRE 1232 208 1232 96 WIRE 1792 208 1792 160 WIRE 2048 208 2048 80 WIRE 720 240 720 112 WIRE 912 256 768 256 WIRE 976 256 912 256 WIRE 1792 256 1792 208 WIRE 848 304 768 304 WIRE 976 320 976 256 WIRE 720 352 720 320 WIRE 720 368 720 352 WIRE -144 464 -144 272 WIRE 96 464 96 48 WIRE 96 464 -144 464 WIRE 208 464 208 288 WIRE 208 464 96 464 WIRE 336 464 336 272 WIRE 336 464 208 464 WIRE 656 464 336 464 WIRE 720 464 720 448 WIRE 720 464 656 464 WIRE 848 464 848 304 WIRE 848 464 720 464 WIRE 976 464 976 400 WIRE 976 464 848 464 WIRE 1184 464 1184 48 WIRE 1184 464 976 464 WIRE 1232 464 1232 288 WIRE 1232 464 1184 464 WIRE 1600 464 1600 224 WIRE 1600 464 1232 464 WIRE 1792 464 1792 336 WIRE 1792 464 1600 464 WIRE 1984 464 1984 0 WIRE 1984 464 1792 464 WIRE 2048 464 2048 288 WIRE 2048 464 1984 464 WIRE 656 480 656 464 FLAG 656 480 0 FLAG 720 352 M FLAG 208 144 Charge FLAG 912 256 Crowbar_on FLAG 1232 96 HV_on FLAG 2048 80 Glitch_start FLAG 1792 208 Anode SYMBOL sw 720 336 R180 SYMATTR InstName S1 SYMATTR Value Crowbar_sw SYMBOL voltage 976 304 R0 WINDOW 0 30 21 Left 2 WINDOW 3 -126 110 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PULSE(0 10 .600005s 1ns 1ns) SYMBOL res 704 352 R0 SYMATTR InstName R1 SYMATTR Value 1meg SYMBOL cap 320 208 R0 WINDOW 0 24 -27 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C1 SYMATTR Value 20µF SYMBOL voltage -144 176 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 6000 SYMBOL sw 64 0 R270 WINDOW 0 39 2 VRight 2 WINDOW 3 20 89 VRight 2 SYMATTR InstName S2 SYMATTR Value Input_charge SYMBOL voltage 208 192 R0 WINDOW 0 6 8 Left 2 WINDOW 3 -175 -274 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value PULSE(0 10 0 1ns 1ns .605) SYMBOL res 32 -16 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 20 SYMBOL ind 704 16 R0 SYMATTR InstName L1 SYMATTR Value 1mH SYMBOL sw 1152 0 R270 WINDOW 0 39 2 VRight 2 WINDOW 3 78 0 VRight 2 SYMATTR InstName S3 SYMATTR Value HV_enable SYMBOL voltage 1232 192 R0 WINDOW 0 6 8 Left 2 WINDOW 3 -135 -24 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V4 SYMATTR Value PULSE(0 10 .55 1ns 1ns 60ms) SYMBOL voltage 1792 240 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V5 SYMATTR Value 50 SYMBOL ind 1312 16 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value 200µH SYMBOL sw 1792 32 R180 WINDOW 0 70 98 Right 2 WINDOW 3 -77 125 Right 2 SYMATTR InstName S4 SYMATTR Value HV_glitch SYMBOL res 1584 128 R0 SYMATTR InstName R3 SYMATTR Value 6000 SYMBOL voltage 2048 192 R0 WINDOW 0 6 8 Left 2 WINDOW 3 -129 117 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V6 SYMATTR Value PULSE(0 10 .600 1ns 1ns 10ms) SYMBOL res 1616 -128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 50 SYMBOL res 1776 64 R0 SYMATTR InstName RA SYMATTR Value 0.001 TEXT -152 624 Left 2 !.tran 1s TEXT -152 544 Left 2 !.model Crowbar_sw SW(Ron=0.0001 Roff=100Meg Vt=5)\n.model Input_charge SW(Ron=0.0001 Roff=100Meg Vt=5)\n.model HV_enable SW(Ron=0.0001 Roff=100Meg Vt=5)\n.model HV_glitch SW(Ron=0.0001 Roff=100Meg Vt=5) TEXT -48 496 Left 2 ;LB3HC. Improved Thyristor crowbar test circuit. TEXT 656 544 Left 2 ;Thyristor series string. 200A TEXT 408 -48 Left 2 ;Elschukom. DIN41684 HV fuse. 10KV. TEXT -32 64 VRight 2 ;6KV DC from PSU/rectifier unit TEXT 304 40 VRight 2 ;Smoothing capacitor bank TEXT 1272 -32 Left 2 ;B+ TEXT 1736 560 Left 2 ;If tube shorts\nthe series resistor\nlimits current. TEXT 1504 240 Left 2 ;Normal tube current TEXT 1312 -56 Left 2 ;Plate choke TEXT 1272 240 Left 2 ;Turn on HV TEXT 1992 168 Left 2 ;Simulate glitch TEXT 656 184 Left 2 ;SCR Crowbar TEXT 1488 -200 Left 2 ;Glitch resistor\n300W RECTANGLE Normal 864 352 528 224 RECTANGLE Normal 704 16 368 -16 RECTANGLE Normal 1904 528 1728 64