Version 4
SHEET 1 992 680
WIRE -288 112 -288 96
WIRE -288 224 -288 192
WIRE -208 288 -288 288
WIRE -288 304 -288 288
WIRE -288 400 -288 384
FLAG -288 224 0
FLAG -288 400 0
FLAG -288 96 vz
FLAG -208 288 OK
IOPIN -208 288 Out
SYMBOL voltage -288 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 10 2m 1n 1n 100u 20m)
SYMBOL bv -288 288 R0
SYMATTR InstName B1
SYMATTR Value V=if(absdelay(V(Vz),td)>1|absdelay(V(Vz),td+3.33m)>1,20,0) tripdt=10n
TEXT -304 -72 Left 2 !.param td=1.667m
TEXT -304 -32 Left 2 !.tran 0 10m 0 1u
TEXT -304 0 Left 2 !.options plotwinsize=0