Version 4 SHEET 1 3104 1240 WIRE 576 -640 560 -640 WIRE 784 -640 656 -640 WIRE 560 -576 560 -640 WIRE 656 -576 560 -576 WIRE 784 -560 784 -640 WIRE 464 -528 400 -528 WIRE 560 -528 560 -576 WIRE 560 -528 544 -528 WIRE 576 -528 560 -528 WIRE 400 -512 400 -528 WIRE 720 -512 720 -576 WIRE 720 -512 640 -512 WIRE 784 -416 784 -464 WIRE 1360 -400 1360 -416 WIRE 1360 -400 1328 -400 WIRE 1392 -400 1360 -400 WIRE 1104 -336 1104 -384 WIRE 1360 -272 1328 -272 WIRE 1376 -272 1360 -272 WIRE 1360 -240 1360 -272 WIRE 1104 -144 1104 -336 WIRE 1104 -144 656 -144 WIRE 656 -64 656 -144 WIRE 656 -64 -48 -64 WIRE 336 0 -80 0 WIRE 992 0 576 0 WIRE 1696 16 1280 16 WIRE 2384 32 1968 32 WIRE -688 48 -704 48 WIRE -688 96 -688 48 WIRE -656 96 -688 96 WIRE -560 96 -576 96 WIRE -80 112 -80 80 WIRE -80 112 -96 112 WIRE -48 112 -48 -64 WIRE -48 112 -80 112 WIRE -32 112 -48 112 WIRE 576 112 576 80 WIRE 576 112 560 112 WIRE 624 112 576 112 WIRE 1280 128 1280 96 WIRE 1280 128 1264 128 WIRE 1328 128 1280 128 WIRE -688 144 -688 96 WIRE -688 144 -720 144 WIRE -240 144 -320 144 WIRE -176 144 -176 112 WIRE -80 144 -80 112 WIRE 336 144 336 0 WIRE 480 144 480 112 WIRE 480 144 336 144 WIRE 576 144 576 112 WIRE 1968 144 1968 112 WIRE 1968 144 1952 144 WIRE 2016 144 1968 144 WIRE 224 160 192 160 WIRE 880 160 848 160 WIRE 992 160 992 0 WIRE 1184 160 1184 128 WIRE 1184 160 992 160 WIRE 1280 160 1280 128 WIRE -688 176 -688 144 WIRE -656 176 -688 176 WIRE -560 176 -560 96 WIRE -560 176 -592 176 WIRE 192 176 192 160 WIRE 224 176 224 160 WIRE 240 176 224 176 WIRE 848 176 848 160 WIRE 880 176 880 160 WIRE 896 176 880 176 WIRE 1584 176 1552 176 WIRE 1696 176 1696 16 WIRE 1872 176 1872 144 WIRE 1872 176 1696 176 WIRE 1968 176 1968 144 WIRE 336 192 336 144 WIRE 992 192 992 160 WIRE 1552 192 1552 176 WIRE 1584 192 1584 176 WIRE 1600 192 1584 192 WIRE 2272 192 2240 192 WIRE 336 208 336 192 WIRE 336 208 304 208 WIRE 992 208 992 192 WIRE 992 208 960 208 WIRE 1696 208 1696 176 WIRE 2240 208 2240 192 WIRE 2272 208 2272 192 WIRE 2288 208 2272 208 WIRE 1696 224 1696 208 WIRE 1696 224 1664 224 WIRE 2384 224 2384 32 WIRE 240 240 240 176 WIRE 896 240 896 176 WIRE 2384 240 2384 224 WIRE 2384 240 2352 240 WIRE -368 256 -368 176 WIRE -192 256 -368 256 WIRE -32 256 -32 240 WIRE 624 256 624 240 WIRE 1600 256 1600 192 WIRE 1328 272 1328 256 WIRE 2288 272 2288 208 WIRE -688 288 -688 176 WIRE -688 288 -720 288 WIRE -656 288 -688 288 WIRE 336 288 336 272 WIRE 992 288 992 272 WIRE 2016 288 2016 272 WIRE -560 304 -560 176 WIRE -560 304 -592 304 WIRE -528 304 -560 304 WIRE 336 304 336 288 WIRE 992 304 992 288 WIRE 1696 304 1696 288 WIRE 1696 320 1696 304 WIRE 2384 320 2384 304 WIRE 2384 336 2384 320 WIRE -432 352 -464 352 WIRE -368 352 -432 352 WIRE -800 384 -800 288 WIRE -288 400 -336 400 WIRE -192 416 -192 256 WIRE -192 416 -224 416 WIRE -336 432 -336 400 WIRE -336 432 -432 432 WIRE 1152 480 1088 480 WIRE -336 496 -336 432 WIRE -192 496 -192 416 WIRE -192 496 -272 496 WIRE 2992 496 2912 496 WIRE 3088 496 3056 496 WIRE 1152 576 1088 576 WIRE 1232 576 1232 480 WIRE 1600 576 1600 480 WIRE 2912 576 2912 496 WIRE 2976 576 2912 576 WIRE 3088 576 3088 496 WIRE 3088 576 3056 576 WIRE 16 608 0 608 WIRE 224 608 96 608 WIRE 2416 640 2384 640 WIRE 2512 640 2416 640 WIRE 1232 656 1232 576 WIRE 1312 656 1232 656 WIRE 1600 656 1600 576 WIRE 2192 656 2144 656 WIRE 2896 656 2736 656 WIRE 1152 672 1088 672 WIRE 1232 672 1232 656 WIRE 224 688 224 608 WIRE 1232 688 1232 672 WIRE 1312 688 1312 656 WIRE 1728 688 1680 688 WIRE 2896 688 2896 656 WIRE 2912 688 2912 576 WIRE 2912 688 2896 688 WIRE 2976 688 2912 688 WIRE 3088 688 3088 576 WIRE 1600 704 1600 656 WIRE 1680 704 1680 688 WIRE 1680 704 1600 704 WIRE 2192 704 2192 656 WIRE 2736 704 2736 656 WIRE 3088 704 3088 688 WIRE 3088 704 3040 704 WIRE -96 720 -160 720 WIRE 0 720 0 608 WIRE 0 720 -16 720 WIRE 16 720 0 720 WIRE -160 736 -160 720 WIRE 160 736 80 736 WIRE 1680 736 1680 704 WIRE 1600 752 1600 704 WIRE 400 768 320 768 WIRE 496 768 464 768 WIRE 224 832 224 784 WIRE 1328 832 1248 832 WIRE 1424 832 1392 832 WIRE 320 848 320 768 WIRE 384 848 320 848 WIRE 496 848 496 768 WIRE 496 848 464 848 WIRE 1984 848 1936 848 WIRE 2192 848 2128 848 WIRE -208 896 -224 896 WIRE 0 896 -128 896 WIRE 1984 896 1984 848 WIRE 1248 912 1248 832 WIRE 1312 912 1248 912 WIRE 1424 912 1424 832 WIRE 1424 912 1392 912 WIRE 1936 944 1936 848 WIRE 2192 944 2128 944 WIRE 2272 944 2272 848 WIRE 320 960 320 848 WIRE 320 960 240 960 WIRE 384 960 320 960 WIRE 0 976 0 896 WIRE 496 976 496 848 WIRE 496 976 448 976 WIRE 576 976 496 976 WIRE 752 976 720 976 WIRE 816 976 752 976 WIRE 1232 992 1072 992 WIRE -320 1008 -384 1008 WIRE -224 1008 -224 896 WIRE -224 1008 -240 1008 WIRE -208 1008 -224 1008 WIRE -384 1024 -384 1008 WIRE -64 1024 -144 1024 WIRE 1232 1024 1232 992 WIRE 1248 1024 1248 912 WIRE 1248 1024 1232 1024 WIRE 1312 1024 1248 1024 WIRE 1424 1024 1424 912 WIRE 1072 1040 1072 992 WIRE 1424 1040 1424 1024 WIRE 1424 1040 1376 1040 WIRE 1936 1040 1936 944 WIRE 2192 1040 2128 1040 WIRE 2272 1040 2272 944 WIRE 2272 1056 2272 1040 WIRE 816 1104 816 976 WIRE 848 1104 816 1104 WIRE 0 1120 0 1072 WIRE 1936 1136 1936 1040 FLAG -320 -176 0 FLAG -192 -176 0 FLAG -320 -256 +8V FLAG -192 -256 -8V FLAG 64 240 -8V FLAG 64 112 +8V FLAG -32 256 0 FLAG -320 224 0 FLAG 160 144 CUT FLAG -80 224 0 FLAG 240 304 0 FLAG -928 320 0 FLAG -928 240 VREF FLAG -624 272 +8V FLAG -624 336 -8V FLAG -464 256 CUT FLAG -368 96 VREF FLAG -432 304 0 FLAG -256 432 +8V FLAG -256 368 -8V FLAG -224 384 0 FLAG -800 144 VREF FLAG -800 464 0 FLAG 304 144 +8V FLAG 336 304 -8V FLAG -656 320 0 FLAG 336 192 LP1 FLAG 720 240 -8V FLAG 720 112 +8V FLAG 624 256 0 FLAG 816 144 CUT FLAG 576 224 0 FLAG 896 304 0 FLAG 960 144 +8V FLAG 992 304 -8V FLAG 992 192 LP2 FLAG 1424 256 -8V FLAG 1424 128 +8V FLAG 1328 272 0 FLAG 1520 160 CUT FLAG 1280 240 0 FLAG 1600 320 0 FLAG 1664 160 +8V FLAG 1696 320 -8V FLAG 1696 208 LP3 FLAG 2112 272 -8V FLAG 2112 144 +8V FLAG 2016 288 0 FLAG 2208 176 CUT FLAG 1968 256 0 FLAG 2288 336 0 FLAG 2352 176 +8V FLAG 2384 336 -8V FLAG 2384 224 LP4 FLAG 1088 480 LP2 FLAG 1088 576 LP3 FLAG 1088 672 LP4 FLAG 1520 480 LP1 FLAG 1520 576 LP2 FLAG 1520 656 LP3 FLAG 1520 752 LP4 FLAG -176 144 in FLAG 2064 656 LP4 FLAG 1312 656 bp4o FLAG 1728 688 hp3o FLAG 2192 656 lp4o FLAG 752 1056 0 FLAG 1344 1008 +8V FLAG 1344 1072 -8V FLAG 1312 1056 0 FLAG 944 976 +8V FLAG 944 1104 -8V FLAG 48 704 +8V FLAG 48 768 -8V FLAG 16 752 0 FLAG -160 816 0 FLAG 224 832 GAIN FLAG 416 944 +8V FLAG 416 1008 -8V FLAG 384 992 0 FLAG 1424 1024 out FLAG 1856 848 LP1 FLAG 1984 848 po FLAG 1856 944 LP2 FLAG 1856 1040 LP3 FLAG 1856 1136 LP4 FLAG 2128 848 LP1 FLAG 2128 944 LP2 FLAG 2128 1040 LP3 FLAG 2272 848 noo FLAG 2512 768 0 FLAG 2416 720 0 FLAG 3008 672 +8V FLAG 3008 736 -8V FLAG 2976 720 0 FLAG 2608 640 +8V FLAG 2608 768 -8V FLAG 2704 672 GAIN FLAG 3088 688 out2 FLAG 2304 576 LP4 FLAG 240 960 lp4o FLAG -176 992 +8V FLAG -176 1056 -8V FLAG -208 1040 0 FLAG -384 1104 0 FLAG 0 1120 GAIN2 FLAG 1040 1008 GAIN2 FLAG 1232 -400 +8V FLAG 1232 -272 -8V FLAG 1136 -368 reso FLAG 1360 -160 0 FLAG 1360 -496 0 FLAG 1520 -272 in FLAG 1472 -400 lp4 FLAG 608 -544 +8V FLAG 608 -480 -8V FLAG 576 -496 0 FLAG 400 -432 0 FLAG 784 -416 reso FLAG 240 176 CAP FLAG 848 976 0 FLAG -784 48 LP4 SYMBOL LM13700 32 96 R0 SYMATTR InstName U1 SYMBOL voltage -320 -272 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 8V SYMBOL voltage -192 -272 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value -8V SYMBOL voltage -320 128 R0 WINDOW 3 24 44 Left 2 WINDOW 123 24 124 Left 2 WINDOW 39 0 0 Left 0 SYMATTR Value PULSE(0 4 0 .0075 0 0 0 2000) SYMATTR InstName V3 SYMBOL cap -176 128 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 4.7µ SYMBOL res -80 96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res -64 240 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R2 SYMATTR Value 220 SYMBOL res -64 96 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL cap 224 240 R0 SYMATTR InstName C2 SYMATTR Value 1n SYMBOL voltage -928 224 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value -5.6 SYMBOL Opamps\\opamp2 -624 240 R0 SYMATTR InstName U2 SYMATTR Value TL072 SYMBOL cap -592 160 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C3 SYMATTR Value 220n SYMBOL res -560 80 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 2k2 SYMBOL res -704 128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 160k SYMBOL res -704 272 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 57k SYMBOL pnp -528 256 R0 SYMATTR InstName Q1 SYMATTR Value 2N3906 SYMBOL pnp -432 256 R0 SYMATTR InstName Q2 SYMATTR Value 2N3906 SYMBOL res -384 80 R0 SYMATTR InstName R7 SYMATTR Value 330k SYMBOL res -448 336 R0 SYMATTR InstName R8 SYMATTR Value 1k SYMBOL Opamps\\opamp2 -256 464 R180 SYMATTR InstName U3 SYMATTR Value TL072 SYMBOL cap -336 512 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C4 SYMATTR Value 100p SYMBOL voltage -800 368 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V5 SYMATTR Value SINE(2 2 1) SYMBOL res 320 192 R0 SYMATTR InstName R9 SYMATTR Value 4k7 SYMBOL LM13700 688 96 R0 SYMATTR InstName U4 SYMBOL res 576 96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R10 SYMATTR Value 10k SYMBOL res 592 240 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R11 SYMATTR Value 220 SYMBOL res 592 96 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R12 SYMATTR Value 10k SYMBOL cap 880 240 R0 SYMATTR InstName C5 SYMATTR Value 1n SYMBOL res 976 192 R0 SYMATTR InstName R13 SYMATTR Value 4k7 SYMBOL LM13700 1392 112 R0 SYMATTR InstName U5 SYMBOL res 1280 112 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R14 SYMATTR Value 10k SYMBOL res 1296 256 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R15 SYMATTR Value 220 SYMBOL res 1296 112 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R16 SYMATTR Value 10k SYMBOL cap 1584 256 R0 SYMATTR InstName C6 SYMATTR Value 1n SYMBOL res 1680 208 R0 SYMATTR InstName R17 SYMATTR Value 4k7 SYMBOL LM13700 2080 128 R0 SYMATTR InstName U6 SYMBOL res 1968 128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R18 SYMATTR Value 10k SYMBOL res 1984 272 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R19 SYMATTR Value 220 SYMBOL res 1984 128 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R20 SYMATTR Value 10k SYMBOL cap 2272 272 R0 SYMATTR InstName C7 SYMATTR Value 1n SYMBOL res 2368 224 R0 SYMATTR InstName R21 SYMATTR Value 4k7 SYMBOL res 1248 464 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R22 SYMATTR Value 100k SYMBOL res 1248 560 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R23 SYMATTR Value 49k9 SYMBOL res 1248 656 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R24 SYMATTR Value 100k SYMBOL res 1616 464 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R25 SYMATTR Value 100k SYMBOL res 1616 560 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R26 SYMATTR Value 33k2 SYMBOL res 1616 640 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R27 SYMATTR Value 33k2 SYMBOL res 1616 736 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R28 SYMATTR Value 100k SYMBOL res 2160 640 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R32 SYMATTR Value 68k SYMBOL LM13700 912 960 R0 SYMATTR InstName U7 SYMBOL res 736 960 R0 SYMATTR InstName R33 SYMATTR Value 1k SYMBOL Opamps\\opamp2 1344 976 R0 SYMATTR InstName U8 SYMATTR Value TL072 SYMBOL res 1408 896 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R29 SYMATTR Value 14k SYMBOL cap 1392 816 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C8 SYMATTR Value 100p SYMBOL Opamps\\opamp2 48 672 R0 SYMATTR InstName U9 SYMATTR Value TL072 SYMBOL voltage -160 720 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V6 SYMATTR Value 4 SYMBOL res 0 704 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R30 SYMATTR Value 18k SYMBOL res 112 592 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R31 SYMATTR Value 2k2 SYMBOL pnp 160 784 M180 SYMATTR InstName Q3 SYMATTR Value 2N3906 SYMBOL res 736 960 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R34 SYMATTR Value 10k SYMBOL Opamps\\opamp2 416 912 R0 SYMATTR InstName U10 SYMATTR Value TL072 SYMBOL res 480 832 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R35 SYMATTR Value 22k SYMBOL cap 464 752 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C9 SYMATTR Value 10p SYMBOL cap 640 960 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C10 SYMATTR Value 4µ7 SYMBOL res 1952 832 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R36 SYMATTR Value 100k SYMBOL res 1952 928 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R37 SYMATTR Value 33k2 SYMBOL res 1952 1024 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R38 SYMATTR Value 16k5 SYMBOL res 1952 1120 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R39 SYMATTR Value 24k9 SYMBOL res 2288 832 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R40 SYMATTR Value 100k SYMBOL res 2288 928 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R41 SYMATTR Value 49k9 SYMBOL res 2288 1024 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R42 SYMATTR Value 49k9 SYMBOL LM13700 2576 624 R0 SYMATTR InstName U11 SYMBOL res 2400 624 R0 SYMATTR InstName R43 SYMATTR Value 220 SYMBOL Opamps\\opamp2 3008 640 R0 SYMATTR InstName U12 SYMATTR Value TL072 SYMBOL res 3072 560 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R44 SYMATTR Value 18k SYMBOL cap 3056 480 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C11 SYMATTR Value 100p SYMBOL res 2400 624 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R45 SYMATTR Value 10k SYMBOL cap 2320 640 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C12 SYMATTR Value 4µ7 SYMBOL Opamps\\opamp2 -176 960 R0 SYMATTR InstName U13 SYMATTR Value TL072 SYMBOL voltage -384 1008 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V7 SYMATTR Value 4 SYMBOL res -224 992 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R46 SYMATTR Value 18k SYMBOL res -112 880 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R47 SYMATTR Value 2k2 SYMBOL pnp -64 1072 M180 SYMATTR InstName Q4 SYMATTR Value 2N3906 SYMBOL LM13700 1264 -416 M0 SYMATTR InstName U14 SYMBOL res 1472 -288 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R48 SYMATTR Value 10k SYMBOL res 1376 -144 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R49 SYMATTR Value 220 SYMBOL res 1376 -384 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R50 SYMATTR Value 10k SYMBOL res 1344 -512 R0 SYMATTR InstName R51 SYMATTR Value 1k SYMBOL cap 1520 -288 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C13 SYMATTR Value 220n SYMBOL Opamps\\opamp2 608 -576 R0 SYMATTR InstName U15 SYMATTR Value TL072 SYMBOL voltage 400 -528 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V8 SYMATTR Value PULSE(0 5 0 2.5 0) SYMBOL res 560 -544 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R52 SYMATTR Value 18k SYMBOL res 672 -656 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R53 SYMATTR Value 2k2 SYMBOL cap 720 -592 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C14 SYMATTR Value 100n SYMBOL pnp 720 -464 M180 SYMATTR InstName Q6 SYMATTR Value 2N3906 SYMBOL res -688 32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R54 SYMATTR Value 57k TEXT -440 736 Left 2 !.include LM13700.sub TEXT -440 760 Left 2 !.include TL072.sub TEXT -440 784 Left 2 !.include 2n390x.sub TEXT -480 616 Left 2 !.wave "export.wav" 16 48k V(out2) TEXT -760 784 Left 2 !.tran 5