Version 4
SHEET 1 1380 788
WIRE 16 80 -256 80
WIRE 448 80 16 80
WIRE 1328 80 448 80
WIRE -144 96 -176 96
WIRE -48 96 -64 96
WIRE -48 160 -48 96
WIRE -48 160 -64 160
WIRE 48 160 -48 160
WIRE 320 176 304 176
WIRE 736 176 592 176
WIRE 1360 176 800 176
WIRE 752 192 704 192
WIRE -256 208 -256 80
WIRE 16 208 16 80
WIRE -48 224 -48 160
WIRE -16 224 -48 224
WIRE 352 224 272 224
WIRE 112 240 112 160
WIRE 112 240 48 240
WIRE 128 240 112 240
WIRE 224 240 224 176
WIRE 224 240 208 240
WIRE 240 240 224 240
WIRE 736 240 736 176
WIRE 752 240 736 240
WIRE -16 256 -48 256
WIRE 320 256 320 176
WIRE 320 256 304 256
WIRE 384 256 320 256
WIRE 512 256 384 256
WIRE 592 256 592 176
WIRE 592 256 512 256
WIRE 240 272 208 272
WIRE 704 272 704 192
WIRE 704 272 672 272
WIRE -256 288 -400 288
WIRE 112 288 112 240
WIRE -400 304 -400 288
WIRE -48 304 -48 256
WIRE 272 304 272 288
WIRE 448 304 448 80
WIRE 448 304 272 304
WIRE -256 320 -256 288
WIRE 384 320 384 256
WIRE 672 320 672 272
WIRE 976 320 672 320
WIRE 1120 320 976 320
WIRE 1216 320 1184 320
WIRE 1360 320 1360 176
WIRE 1360 320 1296 320
WIRE 1376 320 1360 320
WIRE 976 352 976 320
WIRE 352 368 352 224
WIRE 352 368 160 368
WIRE 1328 368 1328 80
WIRE 1328 368 1280 368
WIRE 16 400 16 272
WIRE 16 400 -256 400
WIRE 160 400 160 368
WIRE 160 400 16 400
WIRE 208 400 208 272
WIRE 384 400 208 400
WIRE 1280 400 1280 368
WIRE 592 416 544 416
WIRE 736 416 656 416
WIRE 1040 416 800 416
WIRE 1184 416 1184 320
WIRE 1248 416 1184 416
WIRE 752 432 704 432
WIRE 1376 432 1376 320
WIRE 1376 432 1312 432
WIRE 112 448 112 368
WIRE 208 448 208 400
WIRE 1248 448 1232 448
WIRE 592 464 592 432
WIRE 1184 464 1184 416
WIRE 1360 464 1280 464
WIRE 512 480 512 256
WIRE 544 480 544 416
WIRE 544 480 512 480
WIRE 736 480 736 416
WIRE 752 480 736 480
WIRE 896 496 800 496
WIRE 704 512 704 432
WIRE 704 512 640 512
WIRE 1232 512 1232 448
WIRE 1280 512 1232 512
WIRE 1280 528 1280 512
WIRE 1328 528 1280 528
WIRE 1040 560 1040 416
WIRE 1184 560 1184 544
WIRE 1184 560 1040 560
WIRE 1280 560 1280 528
WIRE 640 608 640 512
WIRE 1120 608 1120 320
WIRE 1120 608 640 608
WIRE 16 624 16 400
WIRE 592 624 592 544
WIRE 592 624 16 624
WIRE 1360 624 1360 464
WIRE 1360 624 592 624
WIRE 1184 640 1184 560
WIRE -144 720 -144 160
WIRE 896 720 -144 720
WIRE 1328 720 1328 528
WIRE 1328 720 1184 720
WIRE -176 784 -176 96
WIRE 960 784 -176 784
WIRE 0 0 0 0
FLAG -400 304 0
FLAG 112 448 0
FLAG -48 304 0
FLAG 208 448 0
FLAG 976 352 0
FLAG 1280 560 0
SYMBOL Opamps\\2pole 16 240 R0
SYMATTR InstName U1
SYMBOL voltage -256 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage -256 304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL cap 48 176 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C1
SYMATTR Value 0.00000015
SYMBOL res -160 176 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R1
SYMATTR Value 4700
SYMBOL res 96 272 R0
SYMATTR InstName R2
SYMATTR Value 1000
SYMBOL Opamps\\2pole 272 256 M180
SYMATTR InstName U2
SYMBOL res 112 256 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R3
SYMATTR Value 4.7k
SYMBOL res 208 192 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL res 368 304 R0
SYMATTR InstName R5
SYMATTR Value 2k
SYMBOL Digital\\inv 592 352 R0
SYMATTR InstName A1
SYMBOL Opamps\\2pole 1280 432 R0
SYMATTR InstName U5
SYMBOL res 1168 448 R0
SYMATTR InstName R6
SYMATTR Value 47k
SYMBOL res 1200 336 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R7
SYMATTR Value 47k
SYMBOL voltage 1184 624 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 4
SYMBOL res -160 112 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R8
SYMATTR Value 4.7k
SYMBOL sw 800 160 R0
SYMATTR InstName S1
SYMBOL sw 800 400 R0
SYMATTR InstName S2
SYMBOL res 576 448 R0
SYMATTR InstName R9
SYMATTR Value 500
TEXT -420 506 Left 0 !.tran 0 0.5 0 0.05 startup