Version 4
SHEET 1 2256 1168
WIRE 96 -32 80 -32
WIRE -336 0 -336 -16
WIRE -240 0 -240 -16
WIRE 464 32 448 32
WIRE -336 96 -336 80
WIRE -240 96 -240 80
WIRE 464 96 448 96
WIRE 96 160 80 160
WIRE 464 160 448 160
WIRE 704 160 512 160
WIRE -80 224 -160 224
WIRE 32 224 0 224
WIRE 96 224 32 224
WIRE 512 224 512 160
WIRE 512 224 448 224
WIRE 544 224 512 224
WIRE 720 224 624 224
WIRE -160 288 -160 224
WIRE -144 288 -160 288
WIRE 96 288 -64 288
WIRE 624 288 448 288
WIRE 720 288 720 224
WIRE 720 288 704 288
WIRE -160 352 -160 288
WIRE -64 352 -160 352
WIRE 64 352 16 352
WIRE 96 352 64 352
WIRE 544 352 448 352
WIRE 720 352 720 288
WIRE 720 352 624 352
WIRE -416 416 -512 416
WIRE -304 416 -336 416
WIRE -256 416 -304 416
WIRE -160 416 -160 352
WIRE -160 416 -176 416
WIRE 96 416 -160 416
WIRE 480 416 448 416
WIRE 720 416 720 352
WIRE 720 416 480 416
WIRE -512 432 -512 416
WIRE -304 448 -304 416
WIRE -512 528 -512 512
WIRE -304 528 -304 512
WIRE 64 528 64 352
WIRE 320 528 64 528
WIRE 480 528 480 416
WIRE 480 528 400 528
WIRE 32 592 32 224
WIRE 128 592 32 592
WIRE 480 592 480 528
WIRE 480 592 208 592
FLAG 464 32 0
FLAG -336 96 0
FLAG -512 528 0
FLAG 80 160 0
FLAG 464 160 0
FLAG -304 528 0
FLAG 704 160 OUT
FLAG -336 -16 +V
FLAG 80 -32 +V
FLAG -240 96 0
FLAG -240 -16 -V
FLAG 464 96 -V
FLAG -512 416 IN
SYMBOL LTC1067 272 224 R0
SYMATTR InstName U1
SYMATTR Value fclk=1Meg
SYMBOL voltage -336 -16 R0
WINDOW 123 24 138 Left 2
WINDOW 39 24 117 Left 2
SYMATTR InstName V1
SYMATTR Value 2.5
SYMBOL voltage -512 416 R0
SYMATTR InstName V3
SYMATTR Value AC 1
SYMBOL res 32 336 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R21
SYMATTR Value 22.6K
SYMBOL res -48 272 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R31
SYMATTR Value 47.5K
SYMBOL res -160 400 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rin2
SYMATTR Value 22.6K
SYMBOL res 16 208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R41
SYMATTR Value 20K
SYMBOL res -432 432 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName Rin1
SYMATTR Value 16.9K
SYMBOL cap -320 448 R0
SYMATTR InstName C1
SYMATTR Value 1500p
SYMBOL res 416 512 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName RH1
SYMATTR Value 118K
SYMBOL res 224 576 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName RL1
SYMATTR Value 24.3K
SYMBOL res 528 336 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R22
SYMATTR Value 45.3K
SYMBOL res 608 272 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R32
SYMATTR Value 29.4K
SYMBOL res 528 208 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R42
SYMATTR Value 47.5K
SYMBOL voltage -240 -16 R0
WINDOW 123 24 138 Left 2
WINDOW 39 24 117 Left 2
SYMATTR InstName V4
SYMATTR Value -2.5
TEXT 560 584 Left 2 !.ac oct 50 1K 100K