Version 4
SHEET 1 1728 1024
WIRE -768 -80 -768 -112
WIRE -752 -80 -768 -80
WIRE -1472 -48 -1472 -80
WIRE -832 -32 -848 -32
WIRE -912 -16 -928 -16
WIRE -880 -16 -912 -16
WIRE -768 -16 -768 -80
WIRE -768 -16 -800 -16
WIRE -928 16 -928 -16
WIRE -1472 48 -1472 32
WIRE -1184 48 -1392 48
WIRE -1184 64 -1184 48
WIRE -1216 80 -1248 80
WIRE -768 80 -768 -16
WIRE -1120 96 -1152 96
WIRE -1088 96 -1120 96
WIRE -976 96 -1008 96
WIRE -1472 112 -1472 48
WIRE -1360 112 -1472 112
WIRE -1280 112 -1296 112
WIRE -1216 112 -1280 112
WIRE -1120 112 -1120 96
WIRE -1280 160 -1280 112
WIRE -1248 192 -1248 80
WIRE -1120 192 -1120 176
WIRE -1120 192 -1248 192
WIRE -1088 192 -1120 192
WIRE -928 192 -928 112
WIRE -928 192 -1008 192
WIRE -1392 208 -1392 48
WIRE -928 208 -928 192
WIRE -1392 304 -1392 288
WIRE -1280 304 -1280 240
WIRE -1280 304 -1392 304
WIRE -1184 304 -1184 128
WIRE -1184 304 -1280 304
WIRE -928 304 -928 288
WIRE -928 304 -1184 304
WIRE -768 304 -768 160
WIRE -768 304 -928 304
FLAG -912 -16 Dn
FLAG -752 -80 0
FLAG -1472 48 in
FLAG -1472 -80 0
SYMBOL voltage -1392 192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -55 87 Left 2
WINDOW 0 -54 24 Left 2
SYMATTR Value 12
SYMATTR InstName V1
SYMBOL nmos -976 16 R0
SYMATTR InstName M1
SYMATTR Value IRFP240
SYMBOL Opamps\\opamp2 -1184 32 R0
WINDOW 3 19 -1 Left 2
SYMATTR Value LM358
SYMATTR InstName U1
SYMBOL cap -1136 112 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL Misc\\EuropeanResistor -1104 208 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -912 304 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R2
SYMATTR Value .47
SYMBOL Misc\\EuropeanResistor -1104 112 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL voltage -768 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 60
SYMBOL voltage -1472 48 R180
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 129 64 Left 2
SYMATTR Value SINE(.05 {Uin} 8k)
SYMATTR InstName V4
SYMBOL cap -1296 96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL Misc\\EuropeanResistor -1264 256 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R6
SYMATTR Value 1Meg
SYMBOL Misc\\EuropeanResistor -896 0 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName RL
SYMATTR Value 20
TEXT -1568 424 Left 2 !.tran 0 1m 0 .1m
TEXT -1376 376 Left 2 !.lib LM358.lib
TEXT -1672 -312 Left 2 ;.step param R3 list 8 20
TEXT -1688 -248 Left 2 ;.meas Iout AVG I(R3)
TEXT -1752 -104 Left 2 !.step param Uin .1 1 .2
TEXT -1728 -176 Left 2 ;.meas Pout avg (60V-V(D))*I(R3)
TEXT -1568 376 Left 2 ;.param Uin=0
TEXT -872 24 Left 2 ;Speaker