Version 4 SHEET 1 3244 1664 WIRE 928 -832 928 -880 WIRE 928 -832 800 -832 WIRE 1040 -832 928 -832 WIRE 1040 -688 1040 -832 WIRE 992 -624 464 -624 WIRE -1072 -576 -1072 -624 WIRE -1072 -576 -1264 -576 WIRE -944 -576 -1072 -576 WIRE -1072 -544 -1072 -576 WIRE -944 -528 -944 -576 WIRE 1040 -528 1040 -608 WIRE 1152 -528 1040 -528 WIRE 1216 -528 1152 -528 WIRE 1344 -528 1216 -528 WIRE 1040 -496 1040 -528 WIRE -944 -464 -1072 -464 WIRE 992 -432 592 -432 WIRE 1216 -400 1216 -528 WIRE 1040 -320 1040 -416 WIRE 1216 -272 1216 -320 WIRE 1248 -272 1216 -272 WIRE 1216 -224 1216 -272 WIRE 1232 -224 1216 -224 WIRE 1232 -192 1232 -224 WIRE 1392 -192 1232 -192 WIRE 1232 -144 1232 -192 WIRE 1232 -16 1232 -64 WIRE 1376 -16 1232 -16 WIRE 1392 -16 1376 -16 WIRE 2656 -16 2400 -16 WIRE -1568 0 -1568 -16 WIRE 1376 16 1376 -16 WIRE 800 48 800 -832 WIRE 1040 48 800 48 WIRE 1232 80 1232 -16 WIRE 1264 80 1232 80 WIRE -1664 112 -1760 112 WIRE -1504 112 -1600 112 WIRE -1376 112 -1424 112 WIRE -1264 144 -1264 -576 WIRE -1248 144 -1264 144 WIRE -1040 144 -1088 144 WIRE 1232 144 1232 80 WIRE 1232 144 1216 144 WIRE -1040 160 -1040 144 WIRE -1376 176 -1376 112 WIRE -1328 176 -1376 176 WIRE -1248 176 -1328 176 WIRE -1040 176 -1040 160 WIRE -1040 176 -1088 176 WIRE 1040 192 1040 48 WIRE 1216 192 1216 144 WIRE -1760 208 -1760 112 WIRE -1376 208 -1376 176 WIRE -1376 208 -1552 208 WIRE -944 208 -1088 208 WIRE 592 256 592 -432 WIRE 992 256 592 256 WIRE -1248 272 -1504 272 WIRE 592 272 592 256 WIRE 592 272 64 272 WIRE -944 288 -944 208 WIRE -720 288 -720 208 WIRE -720 288 -944 288 WIRE -112 288 -720 288 WIRE 64 288 64 272 WIRE 64 288 -112 288 WIRE -1248 304 -1392 304 WIRE -1040 304 -1088 304 WIRE -976 304 -1040 304 WIRE -1040 336 -1040 304 WIRE -1040 336 -1088 336 WIRE 1040 336 1040 272 WIRE 1152 336 1040 336 WIRE 1216 336 1216 272 WIRE 1216 336 1152 336 WIRE 1648 336 1216 336 WIRE -112 352 -112 288 WIRE -80 352 -112 352 WIRE 464 352 464 -624 WIRE 464 352 -16 352 WIRE 592 352 592 272 WIRE -1248 368 -1264 368 WIRE 1040 384 1040 336 WIRE -1504 416 -1504 272 WIRE -1392 416 -1392 304 WIRE -1264 416 -1264 368 WIRE -944 416 -944 288 WIRE -944 416 -1264 416 WIRE -976 448 -976 304 WIRE 464 448 464 352 WIRE 992 448 464 448 WIRE -1504 512 -1504 480 WIRE -1392 512 -1392 496 WIRE -1392 512 -1504 512 WIRE -1168 512 -1392 512 WIRE -1168 544 -1168 512 WIRE -976 560 -976 528 WIRE -864 560 -864 48 WIRE -864 560 -976 560 WIRE 1040 560 1040 464 WIRE -976 576 -976 560 WIRE -864 592 -864 560 WIRE -1552 768 -1552 208 WIRE -1488 768 -1552 768 WIRE 1648 768 1648 336 WIRE 1648 768 -1408 768 WIRE 1664 768 1648 768 FLAG -752 -96 0 FLAG 1040 560 0 FLAG -752 -176 12v FLAG -80 368 0 FLAG 1040 -320 0 FLAG 928 -768 0 FLAG -608 -176 5v FLAG 928 -880 12v FLAG 992 -672 0 FLAG 992 -480 0 FLAG 992 400 0 FLAG 992 208 0 FLAG -608 -96 0 FLAG -1168 544 0 FLAG -1040 160 0 FLAG -1248 336 0 FLAG -1248 240 0 FLAG -720 128 5v FLAG -1088 240 12v FLAG -1088 272 0 FLAG -976 656 0 FLAG -976 560 ref FLAG -1760 288 0 FLAG -1088 368 0 FLAG 1312 -272 0 FLAG 1328 80 0 FLAG -864 656 0 FLAG 1152 400 0 FLAG 1152 -464 0 FLAG -1072 -704 12v FLAG -1072 -464 0 FLAG 1392 -192 speaker_p FLAG 1392 -16 speaker_n FLAG -1424 -1408 0 FLAG -1424 -1488 speaker_out FLAG -1760 112 Vin FLAG -864 -1408 0 FLAG -864 -1488 amp_voltage_gain FLAG 2656 -16 amp_voltage_gain FLAG 2320 -16 0 FLAG 2320 -208 0 FLAG -1328 240 0 SYMBOL voltage -752 -192 R0 SYMATTR InstName V1 SYMATTR Value 12 SYMATTR SpiceLine Rser=0.2 SYMBOL Digital/inv -80 288 R0 WINDOW 3 8 54 Left 2 SYMATTR Value td=10n Vhigh=3.3 SYMATTR InstName A1 SYMBOL cap 912 -832 R0 SYMATTR InstName C6 SYMATTR Value 1000µ SYMBOL voltage -608 -192 R0 SYMATTR InstName V3 SYMATTR Value 5 SYMBOL sw 1040 -704 R0 SYMATTR InstName S1 SYMATTR Value mos SYMBOL sw 1040 -512 R0 SYMATTR InstName S2 SYMATTR Value mos SYMBOL sw 1040 176 R0 SYMATTR InstName S3 SYMATTR Value mos SYMBOL sw 1040 368 R0 SYMATTR InstName S4 SYMATTR Value mos SYMBOL res -1408 400 R0 SYMATTR InstName R5 SYMATTR Value 50k SYMBOL cap -1520 416 R0 SYMATTR InstName C3 SYMATTR Value 550p SYMBOL res -736 112 R0 SYMATTR InstName R6 SYMATTR Value 690 SYMBOL res -992 432 R0 SYMATTR InstName R7 SYMATTR Value 250 SYMBOL res -992 560 R0 SYMATTR InstName R8 SYMATTR Value 250 SYMBOL voltage -1760 192 R0 SYMATTR InstName V2 SYMATTR Value SINE(0 0.1 1000 1m) SYMATTR Value2 AC 0.1 SYMBOL AutoGenerated/tl494 -1168 256 R0 SYMATTR InstName U1 SYMBOL res 1216 -160 R0 SYMATTR InstName R11 SYMATTR Value 4 SYMBOL cap -1600 96 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 100n SYMBOL ind 1200 176 R0 SYMATTR InstName L1 SYMATTR Value 20µ SYMBOL ind 1200 -416 R0 SYMATTR InstName L2 SYMATTR Value 20µ SYMBOL cap 1328 64 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 2.2µ SYMBOL cap 1312 -288 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 2.2µ SYMBOL cap -880 592 R0 SYMATTR InstName C9 SYMATTR Value 100n SYMBOL cap 1136 -528 R0 SYMATTR InstName C2 SYMATTR Value 10n SYMBOL cap 1136 336 R0 SYMATTR InstName C10 SYMATTR Value 1n SYMBOL res -1408 96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 2.2k SYMBOL res -1392 752 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL res -1088 -720 R0 SYMATTR InstName R9 SYMATTR Value 100 SYMBOL res -1088 -560 R0 SYMATTR InstName R10 SYMATTR Value 100 SYMBOL cap -960 -528 R0 SYMATTR InstName C8 SYMATTR Value 100n SYMBOL bv -1424 -1504 R0 SYMATTR InstName B1 SYMATTR Value V=V(speaker_p)-V(speaker_n) SYMBOL bv -864 -1504 R0 SYMATTR InstName B2 SYMATTR Value V=V(speaker_out)/V(Vin) SYMBOL res 2416 -224 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 1k SYMBOL res 2416 -32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R13 SYMATTR Value 1k SYMBOL cap -1344 176 R0 SYMATTR InstName C7 SYMATTR Value 10n TEXT -72 -208 Left 2 !.tran 50m 6.5m 2.5m startup uic\n.four 1kHz 9 V(speaker_out) TEXT 1680 -768 Left 2 !.model mos SW(Ron=.1 Roff=1Meg Vt=0.5 Vh=.2)