Version 4
SHEET 1 880 680
WIRE 96 128 48 128
WIRE 208 128 176 128
WIRE 256 128 208 128
WIRE 384 128 336 128
WIRE 48 144 48 128
WIRE 384 144 384 128
WIRE 48 368 48 224
WIRE 80 368 48 368
WIRE 208 368 208 128
WIRE 208 368 160 368
WIRE 256 368 208 368
WIRE 384 368 384 224
WIRE 384 368 336 368
WIRE 208 384 208 368
WIRE 48 496 48 368
WIRE 176 496 48 496
WIRE 384 496 384 368
WIRE 384 496 256 496
FLAG 384 128 out1
FLAG 48 496 in
FLAG 208 384 0
FLAG 384 496 in1
FLAG 48 128 out
SYMBOL bv 48 128 M0
SYMATTR InstName B1
SYMATTR Value V=5*white(time*1Meg)+100*v(in)
SYMBOL res 192 112 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 1Meg
SYMBOL bv 384 128 R0
SYMATTR InstName B2
SYMATTR Value V=5*white(time*2Meg)+100*v(in1)
SYMBOL res 240 112 M90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 1Meg
SYMBOL voltage 160 496 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 -32 56 VBottom 0
WINDOW 123 0 0 Left 0
WINDOW 39 -60 56 VBottom 0
SYMATTR InstName V1
SYMATTR Value SINE(0 2 1k 0.2)
SYMATTR SpiceLine Rser=600
SYMBOL res 176 352 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 25k
SYMBOL res 352 352 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R5
SYMATTR Value 25k
TEXT -224 176 Left 0 !.tran 0 0.4 0 10u