Version 4
SHEET 1 880 680
WIRE 144 0 112 0
WIRE 256 0 224 0
WIRE 16 128 -32 128
WIRE 112 128 112 0
WIRE 112 128 96 128
WIRE 144 128 112 128
WIRE 256 144 256 0
WIRE 256 144 208 144
WIRE 304 144 256 144
WIRE 144 160 128 160
WIRE 128 208 128 160
FLAG 304 144 OUTPUT
IOPIN 304 144 Out
FLAG -32 128 INPUT
IOPIN -32 128 In
FLAG 128 208 GND
IOPIN 128 208 BiDir
FLAG 176 112 V+
IOPIN 176 112 BiDir
FLAG 176 176 V-
IOPIN 176 176 BiDir
SYMBOL res 112 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL res 240 -16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value {gain*100}
SYMBOL Opamps\\LT1028 176 80 R0
SYMATTR InstName U1