Version 4 SHEET 1 3032 1944 WIRE 1040 1584 960 1584 WIRE 1184 1680 1184 1584 WIRE 1120 1584 1184 1584 WIRE 1344 1680 1344 1584 WIRE 1344 1584 1520 1584 WIRE 1520 1584 1520 1664 WIRE 1520 1744 1520 1840 WIRE 1520 1840 1344 1840 WIRE 1184 1760 1184 1840 WIRE 1184 1840 960 1840 WIRE 1344 1760 1344 1840 WIRE 1520 1840 1520 1856 WIRE 928 608 928 672 WIRE 928 752 928 864 WIRE 1008 608 928 608 WIRE 1088 608 1152 608 WIRE 1312 608 1600 608 WIRE 1600 608 1600 688 WIRE 1600 768 1600 864 WIRE 1600 864 1312 864 WIRE 928 864 928 880 WIRE 1600 864 1600 880 WIRE 1184 656 1184 608 WIRE 1184 608 1152 608 WIRE 1312 656 1312 608 WIRE 1312 816 1312 864 WIRE 1184 816 1184 864 WIRE 1184 864 928 864 WIRE 960 1584 960 1664 WIRE 960 1744 960 1840 WIRE 960 1840 960 1872 WIRE 912 1088 912 1152 WIRE 912 1232 912 1344 WIRE 992 1088 912 1088 WIRE 1072 1088 1136 1088 WIRE 1296 1088 1728 1088 WIRE 1728 1088 1728 1168 WIRE 1728 1248 1728 1344 WIRE 1728 1344 1296 1344 WIRE 912 1344 912 1360 WIRE 1728 1344 1728 1360 WIRE 1168 1136 1168 1088 WIRE 1168 1088 1136 1088 WIRE 1296 1136 1296 1088 WIRE 1296 1296 1296 1344 WIRE 1168 1296 1168 1344 WIRE 1168 1344 912 1344 FLAG 960 1584 in0 FLAG 1520 1584 out1 FLAG 1520 1856 GND FLAG 1184 1584 in1 FLAG 928 880 GND FLAG 928 608 in0k FLAG 1600 608 outk FLAG 1600 880 GND FLAG 1152 608 in1k FLAG 960 1872 GND FLAG 912 1360 GND FLAG 912 1088 in0al FLAG 1728 1088 outal FLAG 1728 1360 GND FLAG 1136 1088 in1al SYMBOL ind2 1168 1664 R0 SYMATTR InstName L10 SYMATTR Value 500mH SYMBOL ind2 1328 1664 R0 SYMATTR InstName L20 SYMATTR Value 500mH SYMBOL res 1504 1648 R0 SYMATTR InstName R20 SYMATTR Value 600 SYMBOL res 1024 1600 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R10 SYMATTR Value 600 SYMBOL res 1584 672 R0 SYMATTR InstName R3 SYMATTR Value 600 SYMBOL res 992 624 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R4 SYMATTR Value 600 SYMBOL VOLTAGE 928 656 R0 WINDOW 39 0 0 Left 0 WINDOW 123 28 112 Left 0 WINDOW 3 -96 280 Left 0 SYMATTR Value2 AC 2 SYMATTR Value PULSE(0 2 1m 10u 10u 1m 2m) SYMATTR InstName V2 SYMBOL VOLTAGE 960 1648 R0 WINDOW 39 0 0 Left 0 WINDOW 123 28 112 Left 0 WINDOW 3 -96 280 Left 0 SYMATTR Value2 AC 2 SYMATTR Value PULSE(0 2 1m 10u 10u 1m 2m) SYMATTR InstName V1 SYMBOL Private\\transformer2 1168 656 R0 SYMATTR InstName U1 SYMATTR SpiceLine L1=0.5H L2=0.5H K=0.95 SYMATTR SpiceModel TRAFO2K SYMBOL res 1712 1152 R0 SYMATTR InstName R1 SYMATTR Value 600 SYMBOL res 976 1104 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R2 SYMATTR Value 600 SYMBOL VOLTAGE 912 1136 R0 WINDOW 39 0 0 Left 0 WINDOW 123 28 112 Left 0 WINDOW 3 -96 280 Left 0 SYMATTR Value2 AC 2 SYMATTR Value PULSE(0 2 1m 10u 10u 1m 2m) SYMATTR InstName V3 SYMBOL Private\\transformer2 1152 1136 R0 SYMATTR InstName U2 SYMATTR SpiceLine N1=707 N2=707 AL=1000nH K=0.95 SYMATTR SpiceModel TRAFO2AL TEXT 880 392 Left 0 !;AC DEC 100 10 100k TEXT 864 352 Left 0 ;.include ./trafos.lib TEXT 880 440 Left 0 !.tran 0 10m 0 10u TEXT 864 104 Left 0 ;AUDIO TRANSFORMER TEST CIRCUIT V1.1 TEXT 848 1520 Left 0 !K1020 L10 L20 0.95 TEXT 840 1488 Left 0 ;The equivalent circuit with single inductors. TEXT 1744 608 Left 0 !* More simmplified transformer model\n* Primary inductance L1, series resistor R1\n* Secondary inductance L2, series resistor R2\n* Coupling factor K <=1\n* Ideal transformer voltage(turns) ratio = SQRT(L2/L1)\n*\n.SUBCKT TRAFO2K 1 2 3 4 LP1={L1} LP2={L2} K12={K}\n+ Rser1={R1} Rser2={R2}\nL1 1 2 {LP1} Rser={Rser1}\nL2 3 4 {LP2} Rser={Rser2}\nK12 L1 L2 {K12}\n.ENDS TRAFO2K TEXT 1832 1040 Left 0 !* LInear transformer model with coupling K and given AL.\n* Inductance L = AL * N * N\n* Primary inductance L1(from N1), series resistor R1\n* Secondary inductance L2(from N2), series resistor R2\n* Coupling factor K <=1\n* Ideal transformer voltage(turns) ratio = N2/N1 = SQRT(L2/L1)\n*\n.SUBCKT TRAFO2AL 1 2 3 4 N1={N1} N2={N2} K12={K}\n+ Rser1={R1} Rser2={R2}\n*\n.PARAM LP1= {AL*N1*N1}\n.PARAM LP2= {AL*N2*N2}\n*\nL1 1 2 {LP1} Rser={Rser1}\nL2 3 4 {LP2} Rser={Rser2}\nK12 L1 L2 {K12}\n*\n.ENDS TRAFO2AL TEXT 1128 544 Left 0 ;Symbol "transformer2.asy" TEXT 936 1016 Left 0 ;Symbol "transformer2.asy" with parameters changed for a different model. TEXT 856 152 Left 0 ;The models come up with the name X-TRAFO.\nClick the right mouse button over this field and replace X-TRAFO with the name of your subcircuit.\nMove the cursor over the transformer symbol, then click the right mouse button again.\nNow any parameter can be entered into the fields Value, SpiceLine or SpiceLine2 of the instance, \nbut don't enter anything into the field Value2. TEXT 856 304 Left 0 ;Use the following line as command line, if you put the model(s) into a file "trafos.lib" .