Version 4
SHEET 1 880 680
WIRE 112 16 112 -80
WIRE 192 16 192 -80
WIRE 192 16 176 16
WIRE 416 32 288 32
WIRE 112 48 112 16
WIRE 112 48 80 48
WIRE 128 80 64 80
WIRE 288 80 288 32
WIRE 128 96 128 80
WIRE 0 112 0 64
WIRE 80 112 80 48
WIRE 96 112 80 112
WIRE -128 128 -176 128
WIRE 192 128 192 16
WIRE 192 128 160 128
WIRE 224 128 192 128
WIRE -128 144 -128 128
WIRE -32 144 -48 144
WIRE 96 144 -32 144
WIRE -32 192 -32 144
WIRE 288 192 288 176
WIRE 288 192 48 192
WIRE 64 224 64 80
WIRE 128 304 128 160
WIRE 192 304 128 304
FLAG 64 304 0
FLAG 192 224 0
FLAG 0 64 0
FLAG -176 208 0
FLAG 416 112 0
SYMBOL Opamps\\UniversalOpamp2 128 128 R0
SYMATTR InstName U1
SYMBOL voltage -176 112 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 1
SYMBOL voltage 64 208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 9
SYMBOL voltage 192 208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 9
SYMBOL res 96 96 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 4.7k
SYMBOL cap 176 0 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 150p
SYMBOL res 208 -96 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 1000k
SYMBOL voltage 416 16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value 30
SYMBOL res -32 128 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 50
SYMBOL res 64 176 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL pnp 224 80 R0
SYMATTR InstName Q1
TEXT -96 336 Left 0 !.dc V1 0 5 0.5