Version 4
SHEET 1 880 680
WIRE -96 16 -176 16
WIRE 128 16 -16 16
WIRE 128 48 128 16
WIRE 128 48 80 48
WIRE 192 48 128 48
WIRE 80 80 80 48
WIRE 128 96 128 48
WIRE 192 96 192 48
WIRE -176 192 -176 16
WIRE 80 192 80 160
WIRE 128 192 128 144
WIRE 128 192 80 192
WIRE 192 192 192 160
WIRE 192 192 128 192
WIRE 128 240 128 192
WIRE 128 240 80 240
WIRE 192 240 128 240
WIRE 80 272 80 240
WIRE 128 288 128 240
WIRE 192 288 192 240
WIRE 80 384 80 352
WIRE 128 384 128 336
WIRE 128 384 80 384
WIRE 192 384 192 352
WIRE 192 384 128 384
WIRE -176 432 -176 272
WIRE 192 432 192 384
FLAG 192 432 0
FLAG -176 432 0
SYMBOL sw 80 176 R180
SYMATTR InstName S1
SYMATTR Value SBS
SYMBOL cap 176 96 R0
SYMATTR InstName C1
SYMATTR Value 0.01uF
SYMBOL res 0 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R
SYMATTR Value 174k
SYMBOL voltage -176 176 M0
SYMATTR InstName V
SYMATTR Value 21V
SYMBOL sw 80 368 R180
SYMATTR InstName S2
SYMATTR Value SBS
SYMBOL cap 176 288 R0
SYMATTR InstName C2
SYMATTR Value 0.008uF
TEXT -216 472 Left 2 !.model SBS SW(Ron=1 Roff=10Meg Vt=2.4 Vh=2)
TEXT -216 496 Left 2 !.tran 0 50m 0 0.001m
TEXT -216 568 Left 2 !.ic V(n002)=0.1