Version 4 SHEET 1 2472 1840 WIRE -336 32 -368 32 WIRE -240 32 -272 32 WIRE -368 128 -368 32 WIRE -352 128 -368 128 WIRE -240 128 -240 32 WIRE -240 128 -272 128 WIRE -288 192 -304 192 WIRE -304 208 -304 192 WIRE -368 224 -368 128 WIRE -336 224 -368 224 WIRE -240 240 -240 128 WIRE -240 240 -272 240 WIRE -80 240 -240 240 WIRE -48 240 -80 240 WIRE -640 256 -688 256 WIRE -608 256 -640 256 WIRE -336 256 -544 256 WIRE -80 272 -80 240 WIRE -640 288 -640 256 WIRE -368 288 -368 224 WIRE -304 288 -304 272 WIRE -288 288 -304 288 WIRE -640 384 -640 368 WIRE -80 384 -80 352 WIRE -368 400 -368 368 WIRE -400 944 -400 912 WIRE -816 992 -816 944 WIRE -752 992 -816 992 WIRE -560 992 -560 944 WIRE -560 992 -624 992 WIRE -400 1040 -400 1024 WIRE -816 1088 -816 992 WIRE -784 1088 -816 1088 WIRE -688 1088 -688 992 WIRE -688 1088 -704 1088 WIRE -672 1088 -688 1088 WIRE -560 1088 -560 992 WIRE -560 1088 -592 1088 WIRE -400 1136 -400 1120 WIRE -688 1152 -688 1088 FLAG -368 400 0 FLAG -48 240 OUT IOPIN -48 240 Out FLAG -640 384 0 FLAG -688 256 INPUT IOPIN -688 256 In FLAG -80 384 0 FLAG -688 1152 0 FLAG -400 1136 0 FLAG -400 912 INPUT IOPIN -400 912 Out FLAG -816 944 V+ IOPIN -816 944 Out FLAG -560 944 V- IOPIN -560 944 Out FLAG -288 192 V+ FLAG -288 288 V- SYMBOL res -384 272 R0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL res -368 144 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R2 SYMATTR Value 1.1k SYMBOL res -656 272 R0 SYMATTR InstName R3 SYMATTR Value 22k SYMBOL polcap -608 272 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C8 SYMATTR Value 10µ SYMBOL cap -272 16 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C29 SYMATTR Value 47p SYMBOL res -96 256 R0 SYMATTR InstName R21 SYMATTR Value 470 SYMBOL voltage -800 1088 R270 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V4 SYMATTR Value 15 SYMBOL voltage -688 1088 R270 WINDOW 0 24 104 Left 2 WINDOW 3 24 16 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V5 SYMATTR Value 15 SYMBOL cap -752 1008 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C37 SYMATTR Value 10n SYMBOL cap -688 1008 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C38 SYMATTR Value 10n SYMBOL voltage -400 1024 R0 WINDOW 123 -88 104 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 -59 41 Invisible 2 WINDOW 0 -59 13 Left 2 SYMATTR Value2 AC 1 0 SYMATTR Value SINE(0 10 1k) SYMATTR InstName V6 SYMBOL opamp2 -304 176 R0 SYMATTR InstName U1 SYMATTR Value NE5532 SYMBOL res -416 928 R0 SYMATTR InstName R17 SYMATTR Value 600 TEXT 120 352 Left 2 !.options plotwinsize=0 TEXT 120 448 Left 2 ;.step param Rx 10k 100k 10k TEXT 120 176 Left 2 ;.ac oct 100 0.1 10Meg TEXT -264 552 Left 2 !.SUBCKT NE5532 1 2 3 4 5\n*\n C1 11 12 7.703E-12\n C2 6 7 23.500E-12\n DC 5 53 DX\n DE 54 5 DX\n DLP 90 91 DX\n DLN 92 90 DX\n DP 4 3 DX\n EGND 99 0 POLY(2) (3,0) (4,0) 0 .5 .5\n FB 7 99 POLY(5) VB VC VE VLP VLN 0 2.893E6 -3E6 3E6 3E6 -3E6\n GA 6 0 11 12 1.382E-3\n GCM 0 6 10 99 13.82E-9\n IEE 10 4 DC 133.0E-6\n HLIM 90 0 VLIM 1K\n Q1 11 2 13 QX\n Q2 12 1 14 QX\n R2 6 9 100.0E3\n RC1 3 11 723.3\n RC2 3 12 723.3\n RE1 13 10 329\n RE2 14 10 329\n REE 10 99 1.504E6\n RO1 8 5 50\n RO2 7 99 25\n RP 3 4 7.757E3\n VB 9 0 DC 0\n VC 3 53 DC 2.700\n VE 54 4 DC 2.700\n VLIM 7 8 DC 0\n VLP 91 0 DC 38\n VLN 0 92 DC 38\n.MODEL DX D(IS=800.0E-18)\n.MODEL QX NPN(IS=800.0E-18 BF=132)\n.ENDS TEXT 120 384 Left 2 !.include potentiometer.sub TEXT 120 416 Left 2 ;.step param w 0 1 0.25 TEXT 120 216 Left 2 !.tran 0 10m 0 1000n TEXT 120 256 Left 2 ;.noise V(OUT) V6 dec 101 1 20k