Version 4
SHEET 1 880 680
WIRE -192 -144 -224 -144
WIRE -80 -144 -112 -144
WIRE -32 -144 -80 -144
WIRE 64 -144 32 -144
WIRE 96 -144 64 -144
WIRE 208 -144 176 -144
WIRE -80 -48 -80 -144
WIRE -48 -48 -80 -48
WIRE 64 -48 64 -144
WIRE 64 -48 32 -48
WIRE 96 32 80 32
WIRE 208 32 208 -144
WIRE 208 32 176 32
WIRE -16 48 -16 0
WIRE 144 128 144 112
WIRE -304 144 -336 144
WIRE -224 144 -224 -144
WIRE -224 144 -304 144
WIRE -160 144 -224 144
WIRE -16 144 -16 112
WIRE -16 144 -80 144
WIRE 80 144 80 32
WIRE 80 144 -16 144
WIRE 112 144 80 144
WIRE 208 160 208 32
WIRE 208 160 176 160
WIRE 224 160 208 160
WIRE 352 160 304 160
WIRE 400 160 352 160
WIRE 112 176 80 176
WIRE -336 208 -336 144
WIRE -16 208 -16 144
WIRE 80 208 80 176
WIRE 144 208 144 192
WIRE 240 304 208 304
WIRE 352 304 352 160
WIRE 352 304 320 304
WIRE -336 336 -336 288
WIRE -16 336 -16 288
WIRE 208 336 208 304
WIRE 192 448 192 416
WIRE 336 448 336 416
WIRE 192 560 192 528
WIRE 336 560 336 528
FLAG 208 336 0
FLAG 80 208 0
FLAG 144 112 +V
FLAG 144 208 -V
FLAG -16 336 0
FLAG -336 336 0
FLAG 400 160 out
FLAG -304 144 in
FLAG 192 560 0
FLAG 336 560 0
FLAG 192 416 +V
FLAG 336 416 -V
SYMBOL Opamps\\UniversalOpamp2 144 160 R0
SYMATTR InstName U1
SYMBOL Misc\\EuropeanResistor 80 48 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R22
SYMATTR Value 1Meg
SYMBOL Misc\\EuropeanResistor 80 -128 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -208 -128 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -176 160 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R21
SYMATTR Value 1Meg
SYMBOL Misc\\EuropeanResistor -32 192 R0
SYMATTR InstName R43
SYMATTR Value 2.2k
SYMBOL Misc\\EuropeanResistor 208 176 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R53
SYMATTR Value 47k
SYMBOL Misc\\EuropeanResistor 224 320 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R54
SYMATTR Value 47k
SYMBOL cap -32 -128 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 180n
SYMBOL cap -32 48 R0
SYMATTR InstName C2
SYMATTR Value 18n
SYMBOL potentiometer 48 -64 R90
WINDOW 0 52 -2 VRight 2
WINDOW 3 11 -32 VLeft 2
SYMATTR InstName RV1
SYMATTR Value Rtot=100k wiper={pos}
SYMBOL voltage -336 192 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 0
SYMATTR Value2 AC 1
SYMBOL voltage 192 432 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL voltage 336 432 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value -12
TEXT -352 536 Left 2 !.ac dec 100 1 10k
TEXT -352 488 Left 2 !.inc potentiometer.sub
TEXT -352 576 Left 2 !.step param pos list 0 0.25 0.5 0.75 1
TEXT -56 -64 Left 2 ;0
TEXT 24 -64 Left 2 ;1