Version 4
SHEET 1 888 680
WIRE 16 64 0 64
WIRE 112 64 96 64
WIRE 224 64 208 64
WIRE 0 80 0 64
WIRE 96 80 96 64
WIRE 208 80 208 64
WIRE 176 256 144 256
WIRE 304 256 256 256
WIRE 144 320 144 256
WIRE 192 320 144 320
WIRE 304 320 304 256
WIRE 304 320 256 320
WIRE 224 384 208 384
WIRE 208 400 208 384
WIRE 48 416 0 416
WIRE 144 416 144 320
WIRE 144 416 128 416
WIRE 176 416 144 416
WIRE 304 432 304 320
WIRE 304 432 240 432
WIRE 336 432 304 432
WIRE 0 448 0 416
WIRE 176 448 144 448
WIRE 144 464 144 448
WIRE 208 480 208 464
WIRE 224 480 208 480
WIRE 0 528 0 512
FLAG 0 160 0
FLAG 96 160 0
FLAG 16 64 vcc
FLAG 112 64 vee
FLAG 224 384 vcc
FLAG 224 480 vee
FLAG 144 464 0
FLAG 0 528 0
FLAG 0 416 in
FLAG 336 432 out
FLAG 224 64 test
FLAG 208 160 0
SYMBOL voltage 0 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 112 Left 2
SYMATTR SpiceLine Rser=100m
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL voltage 96 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 112 Left 2
SYMATTR SpiceLine Rser=100m
SYMATTR InstName V2
SYMATTR Value -10
SYMBOL res 272 240 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R1
SYMATTR Value {r1}
SYMBOL cap 256 304 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 123 48 32 VTop 2
SYMATTR InstName C1
SYMATTR Value {c1}
SYMATTR Value2 ic=0
SYMBOL res 32 432 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL voltage 0 432 R0
WINDOW 123 24 112 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 1m
SYMATTR InstName V3
SYMATTR Value PULSE(-500m 500m 0 1u 1u 249u 500u)
SYMBOL Opamps\\UniversalOpamp2 208 432 R0
SYMATTR InstName U1
SYMBOL bv 208 64 R0
SYMATTR InstName B1
SYMATTR Value V=-50m*(exp(time*(-1/(r1*c1))))
TEXT -24 272 Left 2 !;tran 0 200m 0 1u startup
TEXT 24 576 Left 2 ;PULSE(500m -500m 1m 1u 1u 0.25m 0.5m)
TEXT 24 560 Left 2 ;PWL(0 0 1u 0 1.01u 500m repeat forever (0 500m 249.99u 500m 250.01u -500m 499.99u -500m 500.01u 500m) endrepeat
TEXT -24 288 Left 2 !.param r1=100k\n.param c1=100n
TEXT -24 256 Left 2 !.ac oct 100 1m 1k
TEXT -24 216 Left 2 !.step param r1 list 100k 1Meg 10Meg 100Meg