Version 4
SHEET 1 880 680
WIRE 112 208 80 208
WIRE 240 208 192 208
WIRE -256 240 -320 240
WIRE -160 240 -192 240
WIRE -16 240 -80 240
WIRE 16 240 -16 240
WIRE -16 272 -16 240
WIRE -320 288 -320 240
WIRE 240 304 240 208
WIRE 80 320 80 304
WIRE 96 320 80 320
WIRE 192 320 176 320
WIRE -320 400 -320 368
WIRE -16 400 -16 336
WIRE -16 400 -320 400
WIRE 192 400 192 320
WIRE 192 400 -16 400
WIRE 240 400 240 384
WIRE 240 400 192 400
WIRE 192 416 192 400
FLAG 192 416 0
FLAG -16 240 Str
FLAG 80 320 div
SYMBOL cap -32 272 R0
SYMATTR InstName C2
SYMATTR Value 180n
SYMBOL diode -256 256 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL voltage 240 288 R0
WINDOW 3 -8 58 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 -77 98 Left 0
SYMATTR Value 24
SYMATTR InstName V1
SYMBOL res 96 224 R270
WINDOW 0 28 -13 VRight 0
WINDOW 3 30 93 VRight 0
SYMATTR InstName R2
SYMATTR Value 180
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 192 304 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 47
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage -320 272 R0
WINDOW 3 12 113 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 26 102 Left 0
WINDOW 0 -13 60 Left 0
SYMATTR Value PULSE(0 15 0 0 0 5m 10m)
SYMATTR InstName V2
SYMBOL res -176 256 R270
WINDOW 0 30 -15 VRight 0
WINDOW 3 30 86 VRight 0
SYMATTR InstName R1
SYMATTR Value 56k
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Miscel\\nujt 32 208 R0
WINDOW 0 -10 20 Left 0
WINDOW 38 69 52 Center 0
SYMATTR InstName U1
TEXT -336 200 Left 0 !.tran .2