Version 4
SHEET 1 1128 680
WIRE 224 -112 0 -112
WIRE 352 -112 224 -112
WIRE 496 -112 352 -112
WIRE -64 -64 -64 -112
WIRE 224 -64 224 -112
WIRE -208 -32 -448 -32
WIRE 0 16 0 -112
WIRE 16 16 0 16
WIRE 352 32 352 -112
WIRE 368 32 352 32
WIRE 0 48 0 16
WIRE 16 48 16 16
WIRE -208 64 -208 -32
WIRE -64 64 -64 16
WIRE -64 64 -128 64
WIRE -32 64 -64 64
WIRE 352 64 352 32
WIRE 368 64 368 32
WIRE 64 80 32 80
WIRE 96 80 64 80
WIRE 224 80 224 16
WIRE 224 80 160 80
WIRE 320 80 224 80
WIRE -64 96 -128 96
WIRE -32 96 -64 96
WIRE 432 96 384 96
WIRE 448 96 432 96
WIRE 320 112 288 112
WIRE 0 128 0 112
WIRE 224 144 224 80
WIRE -448 160 -448 128
WIRE -208 160 -208 96
WIRE -208 160 -448 160
WIRE 288 160 288 112
WIRE 432 160 432 96
WIRE 432 160 288 160
WIRE -64 192 -64 96
WIRE 64 192 64 80
WIRE 64 192 16 192
WIRE 224 304 224 224
WIRE 352 304 352 128
FLAG 352 304 0
FLAG 0 128 0
FLAG -64 -112 0
FLAG 224 304 0
SYMBOL voltage 496 -128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 6.5
SYMBOL cap 448 112 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C4
SYMATTR Value 2.2µ
SYMBOL cap 96 96 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C5
SYMATTR Value 2.2µ
SYMBOL OPA847 352 32 R0
SYMATTR InstName U1
SYMBOL OPA847 0 16 R0
SYMATTR InstName U2
SYMBOL res -112 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 -20 15 VTop 2
SYMATTR InstName R1
SYMATTR Value 27k
SYMBOL res -112 80 R90
WINDOW 0 67 69 VBottom 2
WINDOW 3 40 27 VTop 2
SYMATTR InstName R2
SYMATTR Value 27k
SYMBOL res 32 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 27k
SYMBOL res -48 32 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R4
SYMATTR Value 27k
SYMBOL res 208 -80 R0
SYMATTR InstName R5
SYMATTR Value 47k
SYMBOL res 208 128 R0
SYMATTR InstName R6
SYMATTR Value 47k
SYMBOL voltage -448 32 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 0 125k)
SYMATTR Value2 AC 100m 0
SYMBOL res -464 -48 R0
SYMATTR InstName R7
SYMATTR Value 50
TEXT 176 -96 Left 2 !.ac lin 500 1k 1000k