* SPICE netlist
Q1 out1 N001 N004 0 2N3904
R3 9V out2 1k
R4 9V out1 1k
V1 in 0 PULSE(-.01 .01 0 10n 10n 490n 1u) AC 1
V2 9V 0 9
I1 N004 0 1m
I2 N005 0 1m
C1 N004 0 1
C2 N005 0 1
R1 9V out3 1k
I3 N006 0 1m
C3 N006 0 1
Q2 out3 N003 N006 0 BC850
Q3 out2 N002 N005 0 BC850_KF0
R2 in N001 {RSOURCE}
R5 in N002 {RSOURCE}
R6 in N003 {RSOURCE}
+ ISE=55.668F NE=2.567 NR=1.015 BR=7.745 VAR=14.000 IKR=1.000
+ ISC=1.084P NC=4.063
+ RB=9.000 IRB=0.100M RBM=4.500
+ RE=0.350 RC=1.445
+ CJE=13.050P VJE=0.690 MJE=0.375 FC=0.750
+ CJC=4.100P VJC=0.750 MJC=0.420 XCJC=0.650
+ TF=0.620N TR=2.5N PTF=1.000
+ XTF=68.000 VTF=1.000 ITF=0.720
+ XTB=1.400 EG=1.110 XTI=3.200
+ KF=10.000F AF=1.000)
+ ISE=55.668F NE=2.567 NR=1.015 BR=7.745 VAR=14.000 IKR=1.000
+ ISC=1.084P NC=4.063
+ RB=9.000 IRB=0.100M RBM=4.500
+ RE=0.350 RC=1.445
+ CJE=13.050P VJE=0.690 MJE=0.375 FC=0.750
+ CJC=4.100P VJC=0.750 MJC=0.420 XCJC=0.650
+ TF=0.620N TR=2.5N PTF=1.000
+ XTF=68.000 VTF=1.000 ITF=0.720
+ XTB=1.400 EG=1.110 XTI=3.200
+ KF=0.000F AF=1.000)
.noise V(out3) V1 dec 100 1 1e7
.param RSOURCE=1
.step param RSOURCE 1 601 200

* LTspice schematic (.asc)
Version 4
SHEET 1 1456 512
WIRE -728 96 -728 32
WIRE -728 240 -728 176
WIRE -712 -224 -712 -256
WIRE -712 -112 -712 -144
WIRE -440 32 -728 32
WIRE -312 32 -360 32
WIRE -248 -208 -248 -256
WIRE -248 -96 -248 -128
WIRE -248 -16 -248 -96
WIRE -248 112 -248 80
WIRE -248 144 -248 112
WIRE -248 256 -248 224
WIRE -200 -96 -248 -96
WIRE -136 112 -248 112
WIRE -136 144 -136 112
WIRE -136 256 -136 208
WIRE 40 32 8 32
WIRE 152 32 120 32
WIRE 216 -208 216 -256
WIRE 216 -96 216 -128
WIRE 216 -16 216 -96
WIRE 216 112 216 80
WIRE 216 144 216 112
WIRE 216 256 216 224
WIRE 264 -96 216 -96
WIRE 328 112 216 112
WIRE 328 144 328 112
WIRE 328 256 328 208
WIRE 440 32 408 32
WIRE 552 32 520 32
WIRE 616 -208 616 -256
WIRE 616 -96 616 -128
WIRE 616 -16 616 -96
WIRE 616 112 616 80
WIRE 616 144 616 112
WIRE 616 256 616 224
WIRE 664 -96 616 -96
WIRE 728 112 616 112
WIRE 728 144 728 112
WIRE 728 256 728 208
FLAG -728 240 0
FLAG -728 32 in
FLAG 8 32 in
FLAG -248 -256 9V
FLAG 216 -256 9V
FLAG -712 -256 9V
FLAG -712 -112 0
FLAG 264 -96 out2
IOPIN 864 -16 Out
FLAG -200 -96 out1
IOPIN 400 -16 Out
FLAG 216 256 0
FLAG -248 256 0
FLAG 328 256 0
FLAG -136 256 0
FLAG 408 32 in
FLAG 616 -256 9V
FLAG 664 -96 out3
IOPIN 1264 -16 Out
FLAG 616 256 0
FLAG 728 256 0
SYMBOL npn -312 -16 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL res 200 -224 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res -264 -224 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL voltage -728 80 R0
SYMATTR InstName V1
SYMATTR Value PULSE(-.01 .01 0 10n 10n 490n 1u)
SYMATTR Value2 AC 1
SYMBOL voltage -712 -240 R0
SYMATTR InstName V2
SYMATTR Value 9
SYMBOL current -248 144 R0
SYMATTR InstName I1
SYMATTR Value 1m
SYMBOL current 216 144 R0
SYMATTR InstName I2
SYMATTR Value 1m
SYMBOL cap -152 144 R0
SYMATTR InstName C1
SYMATTR Value 1
SYMBOL cap 312 144 R0
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL res 600 -224 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL current 616 144 R0
SYMATTR InstName I3
SYMATTR Value 1m
SYMBOL cap 712 144 R0
SYMATTR InstName C3
SYMATTR Value 1
SYMBOL npn 552 -16 R0
SYMATTR InstName Q2
SYMATTR Value BC850
SYMBOL npn 152 -16 R0
SYMATTR InstName Q3
SYMATTR Value BC850_KF0
SYMBOL res -456 48 R270
SYMATTR InstName R2
SYMATTR Value {RSOURCE}
SYMBOL res 24 48 R270
SYMATTR InstName R5
SYMATTR Value {RSOURCE}
SYMBOL res 424 48 R270
SYMATTR InstName R6
SYMATTR Value {RSOURCE}