Version 4.1
SHEET 1 1016 680
WIRE 224 -208 80 -208
WIRE 528 -208 224 -208
WIRE 80 -176 80 -208
WIRE 224 -176 224 -208
WIRE 224 32 224 -96
WIRE 256 32 224 32
WIRE 400 32 320 32
WIRE 528 48 528 -208
WIRE 224 96 224 32
WIRE -528 128 -544 128
WIRE -32 128 -528 128
WIRE 80 128 80 -96
WIRE 80 128 32 128
WIRE 176 128 80 128
WIRE 80 208 80 128
WIRE 224 208 224 160
WIRE -528 224 -528 128
WIRE -528 336 -528 304
WIRE -144 336 -144 272
WIRE -144 336 -528 336
WIRE 80 336 80 288
WIRE 80 336 -144 336
WIRE 224 336 224 288
WIRE 224 336 80 336
WIRE 528 336 528 128
WIRE 528 336 224 336
WIRE 224 352 224 336
FLAG 224 352 0
FLAG -544 128 IN
IOPIN -544 128 In
FLAG 400 32 OUT
IOPIN 400 32 Out
SYMBOL voltage 528 32 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL Misc\\EuropeanResistor 208 -192 R0
SYMATTR InstName R1
SYMATTR Value 4K
SYMBOL Misc\\EuropeanResistor 64 -192 R0
SYMATTR InstName R2
SYMATTR Value 60K
SYMBOL Misc\\signal -144 176 R0
WINDOW 123 24 132 Left 2
WINDOW 39 0 0 Left 0
SYMATTR Value2 AC 1
SYMATTR InstName V2
SYMBOL Misc\\EuropeanResistor 64 192 R0
SYMATTR InstName R3
SYMATTR Value 12K
SYMBOL Misc\\EuropeanResistor 208 192 R0
SYMATTR InstName R4
SYMATTR Value 1K
SYMBOL polcap 256 48 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C2
SYMATTR Value 100µ
SYMBOL polcap 32 112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 100µ
SYMBOL Misc\\signal -528 208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(-1 1 0 10u 10u 0.5m 1m)
SYMBOL sym\\Bipolar\ Transistors\\2SC2712 192 112 R0
SYMATTR InstName U1
TEXT -528 -152 Left 2 !.tran 10m
TEXT -528 -120 Left 2 ;.ac dec 1000 10 100K