Version 4 SHEET 1 1740 680 WIRE 1616 32 1584 32 WIRE 1728 32 1680 32 WIRE -144 48 -288 48 WIRE 176 48 -144 48 WIRE 544 48 176 48 WIRE 848 48 544 48 WIRE 1280 48 848 48 WIRE 1536 48 1280 48 WIRE -288 96 -288 48 WIRE -144 96 -144 48 WIRE 1392 112 1200 112 WIRE 1584 112 1584 32 WIRE 1600 112 1584 112 WIRE 1728 112 1728 32 WIRE 1728 112 1680 112 WIRE 32 128 0 128 WIRE 112 128 96 128 WIRE 272 128 112 128 WIRE 480 128 464 128 WIRE 576 128 480 128 WIRE 784 128 752 128 WIRE 976 128 784 128 WIRE 1536 160 1536 48 WIRE 1648 160 1536 160 WIRE 176 176 176 48 WIRE 544 176 544 48 WIRE 848 176 848 48 WIRE 112 192 112 128 WIRE 144 192 112 192 WIRE 480 192 480 128 WIRE 512 192 480 192 WIRE 784 192 784 128 WIRE 816 192 784 192 WIRE 1280 192 1280 48 WIRE 272 208 272 128 WIRE 272 208 208 208 WIRE 576 208 576 128 WIRE 976 208 976 128 WIRE 976 208 880 208 WIRE 1056 208 1040 208 WIRE 1088 208 1056 208 WIRE 1200 208 1200 112 WIRE 1200 208 1168 208 WIRE 1248 208 1200 208 WIRE 1648 208 1648 160 WIRE -144 224 -144 176 WIRE -144 224 -240 224 WIRE -96 224 -144 224 WIRE 0 224 0 128 WIRE 0 224 -16 224 WIRE 16 224 0 224 WIRE 112 224 96 224 WIRE 144 224 112 224 WIRE 272 224 272 208 WIRE 304 224 272 224 WIRE 400 224 400 128 WIRE 400 224 384 224 WIRE 512 224 480 224 WIRE 576 224 576 208 WIRE 608 224 576 224 WIRE 688 224 688 128 WIRE 704 224 688 224 WIRE 800 224 784 224 WIRE 816 224 800 224 WIRE 1392 224 1392 112 WIRE 1392 224 1312 224 WIRE 1488 224 1456 224 WIRE 1584 224 1584 112 WIRE 1584 224 1568 224 WIRE 1616 224 1584 224 WIRE 1248 240 1200 240 WIRE 1728 240 1728 112 WIRE 1728 240 1680 240 WIRE -144 256 -144 224 WIRE 800 256 800 224 WIRE 1616 256 1584 256 WIRE 112 272 112 224 WIRE 480 272 480 224 WIRE 1056 288 1056 208 WIRE 1088 288 1056 288 WIRE 1200 288 1200 240 WIRE 1200 288 1152 288 WIRE 1200 304 1200 288 WIRE -240 336 -240 224 WIRE 1200 400 1200 384 WIRE 1584 400 1584 256 WIRE 1584 400 1200 400 WIRE 1200 416 1200 400 WIRE -240 432 -240 400 WIRE -288 560 -288 176 WIRE -240 560 -240 512 WIRE -240 560 -288 560 WIRE -144 560 -144 336 WIRE -144 560 -240 560 WIRE 112 560 112 336 WIRE 112 560 -144 560 WIRE 176 560 176 240 WIRE 176 560 112 560 WIRE 240 560 176 560 WIRE 480 560 480 336 WIRE 480 560 240 560 WIRE 544 560 544 240 WIRE 544 560 480 560 WIRE 800 560 800 320 WIRE 800 560 544 560 WIRE 848 560 848 240 WIRE 848 560 800 560 WIRE 1200 560 1200 496 WIRE 1200 560 848 560 WIRE 1280 560 1280 256 WIRE 1280 560 1200 560 WIRE 1648 560 1648 272 WIRE 1648 560 1280 560 WIRE 240 608 240 560 FLAG 240 608 0 SYMBOL res 112 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 33k SYMBOL res 0 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 33k SYMBOL res 496 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 47k SYMBOL res 400 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 47k SYMBOL res 800 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 36k SYMBOL res 704 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 36k SYMBOL cap 96 112 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 47nF SYMBOL cap 464 112 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 47nF SYMBOL cap 752 112 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 36.3nF SYMBOL cap 128 336 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C4 SYMATTR Value 1nF SYMBOL cap 496 336 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C5 SYMATTR Value 1nF SYMBOL cap 816 320 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C6 SYMATTR Value 1nF SYMBOL res -160 80 R0 SYMATTR InstName R7 SYMATTR Value 10K SYMBOL res -160 240 R0 SYMATTR InstName R8 SYMATTR Value 10K SYMBOL voltage -240 416 R0 WINDOW 3 24 96 Invisible 2 WINDOW 123 24 118 Left 2 SYMATTR Value SINE(0 0.01V) SYMATTR Value2 AC 0.01V 1 SYMATTR InstName V2 SYMATTR SpiceLine Rser=0 Cpar=0 SYMBOL cap -256 336 R0 SYMATTR InstName C7 SYMATTR Value 100µF SYMBOL Opamps/OP747 176 144 R0 SYMATTR InstName U1 SYMBOL Opamps/OP747 544 144 R0 SYMATTR InstName U2 SYMBOL Opamps/OP747 848 144 R0 SYMATTR InstName U3 SYMBOL Opamps/OP747 1280 160 R0 SYMATTR InstName U4 SYMBOL cap 1040 192 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C8 SYMATTR Value 2.2nF SYMBOL res 1184 288 R0 SYMATTR InstName R9 SYMATTR Value 750K SYMBOL res 1184 192 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R10 SYMATTR Value 10K SYMBOL cap 1152 272 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C9 SYMATTR Value 2.2nF SYMBOL voltage 1200 400 R0 SYMATTR InstName V1 SYMATTR Value 6V SYMATTR SpiceLine Rser=0 SYMBOL voltage -288 80 R0 WINDOW 3 24 38 Left 2 SYMATTR Value 12V SYMATTR InstName V3 SYMATTR SpiceLine Rser=0 SYMBOL Opamps/OP747 1648 176 R0 SYMATTR InstName U5 SYMBOL cap 1456 208 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C10 SYMATTR Value 10µF SYMBOL res 1584 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R11 SYMATTR Value 1K SYMBOL res 1696 96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 120K SYMBOL cap 1680 16 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C11 SYMATTR Value 1nF TEXT -168 616 Left 2 !.ac dec 100 10 10k