Version 4
SHEET 1 948 680
WIRE 160 -128 128 -128
WIRE 240 -128 224 -128
WIRE 128 -32 128 -128
WIRE 144 -32 128 -32
WIRE 240 -32 240 -128
WIRE 240 -32 224 -32
WIRE -432 112 -432 48
WIRE -320 112 -320 48
WIRE 176 112 176 64
WIRE -16 128 -80 128
WIRE 128 128 128 -32
WIRE 128 128 64 128
WIRE 144 128 128 128
WIRE 240 144 240 -32
WIRE 240 144 208 144
WIRE 144 160 96 160
WIRE -432 224 -432 192
WIRE -320 224 -320 192
WIRE 96 256 96 160
WIRE 176 224 176 176
WIRE -80 256 -80 208
WIRE 0 0 0 0
FLAG 96 256 0
FLAG -80 256 0
FLAG -432 224 0
FLAG -320 224 0
FLAG -432 48 V+
FLAG -320 48 V-
FLAG 176 224 V-
FLAG 176 64 V+
SYMBOL res 128 -16 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName Rf
SYMATTR Value 100k
SYMBOL res -32 144 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R-
SYMATTR Value 100
SYMBOL Misc\\signal -80 112 R0
WINDOW 0 -68 40 Left 0
WINDOW 3 -88 94 Left 0
SYMATTR InstName Vin
SYMATTR Value AC 1
SYMBOL cap 224 -144 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName Cf
SYMATTR Value 10n
SYMBOL Opamps\\opamp2 176 80 R0
SYMATTR InstName U
SYMATTR Value lm741/ns
SYMBOL voltage -432 96 R0
WINDOW 0 -72 14 Left 0
WINDOW 3 -49 101 Left 0
SYMATTR InstName VDC+
SYMATTR Value 15
SYMBOL voltage -320 208 R180
WINDOW 0 9 99 Left 0
WINDOW 3 11 7 Left 0
SYMATTR InstName VDC-
SYMATTR Value 15
TEXT 392 8 Left 0 !.ac dec 100 1 10Meg
TEXT 384 56 Left 0 !.lib ph5.lib
TEXT 400 184 Left 0 ;Op-Amp to try: op72,  ad711, lm741/ns