Version 4
SHEET 1 900 680
WIRE 112 16 48 16
WIRE 288 16 112 16
WIRE 288 48 288 16
WIRE 224 96 112 96
WIRE 288 160 288 144
WIRE 288 160 -176 160
WIRE -176 176 -176 160
WIRE 112 176 112 96
WIRE 64 240 -80 240
WIRE 288 240 288 160
WIRE 112 336 112 272
WIRE 288 336 288 320
WIRE 288 336 112 336
WIRE 288 352 288 336
WIRE -176 400 -176 320
WIRE -80 400 -80 240
WIRE -80 400 -176 400
FLAG -176 480 0
FLAG -80 464 0
FLAG 288 432 0
FLAG -32 16 0
SYMBOL pnp 224 144 M180
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL res 96 0 R0
SYMATTR InstName R1
SYMATTR Value 470R
SYMBOL res 272 224 R0
SYMATTR InstName R2
SYMATTR Value 1000
SYMBOL res 272 336 R0
SYMATTR InstName R3
SYMATTR Value 470
SYMBOL res -192 384 R0
SYMATTR InstName R4
SYMATTR Value {R4}
SYMBOL res -192 160 R0
SYMATTR InstName R5
SYMATTR Value {R5}
SYMBOL cap -192 256 R0
SYMATTR InstName C1
SYMATTR Value 2.2n
SYMBOL cap -96 400 R0
SYMATTR InstName C2
SYMATTR Value 2.2n
SYMBOL voltage 64 16 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 -4 56 VBottom 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 15
SYMATTR Value2 AC 0.1
SYMBOL njf 64 176 R0
SYMATTR InstName J1
SYMATTR Value BF245C
TEXT -200 504 Left 2 !.ac dec 300 1 100meg
TEXT -1016 8 Left 2 !.step param R5 list 100 2500 7500 50000 100000
TEXT -1016 40 Left 2 !.step param R4 list  100 2500 7500 50000 100000