Version 4
SHEET 1 1088 680
WIRE 160 128 160 96
WIRE 176 128 160 128
WIRE 160 144 160 128
WIRE 176 144 176 128
WIRE -288 160 -336 160
WIRE -32 160 -32 128
WIRE -32 160 -208 160
WIRE 128 160 -32 160
WIRE -32 176 -32 160
WIRE 288 176 192 176
WIRE 336 176 288 176
WIRE -336 192 -336 160
WIRE 128 192 112 192
WIRE 160 224 160 208
WIRE -32 288 -32 256
WIRE 0 288 -32 288
WIRE 112 288 112 192
WIRE 112 288 80 288
WIRE 176 288 112 288
WIRE 288 288 288 176
WIRE 288 288 256 288
WIRE -336 304 -336 272
WIRE -32 304 -32 288
WIRE 112 448 112 432
WIRE 224 448 224 432
WIRE 112 544 112 528
WIRE 224 544 224 528
FLAG -336 304 0
FLAG 160 96 V+
FLAG 160 224 V-
FLAG -32 304 0
FLAG 336 176 out
IOPIN 336 176 Out
FLAG -32 128 in
IOPIN -32 128 In
FLAG 112 544 0
FLAG 224 544 0
FLAG 112 432 V+
FLAG 224 432 V-
SYMBOL voltage -336 176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 19 106 Left 2
WINDOW 3 -27 182 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 0.2 5n 1n 1n 20n 40n)
SYMBOL res 272 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 750
SYMBOL res -16 304 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 39
SYMBOL res -48 160 R0
SYMATTR InstName R3
SYMATTR Value 50
SYMBOL voltage 112 432 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage 224 432 R0
SYMATTR InstName V3
SYMATTR Value -5
SYMBOL OPA847 160 112 R0
SYMATTR InstName U1
SYMBOL res -304 176 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 50
TEXT -368 432 Left 2 !.tran 0.1u
TEXT 48 360 Left 2 ;Stable for Gains >12