Version 4
SHEET 1 2168 752
WIRE 352 -192 288 -192
WIRE 512 -192 352 -192
WIRE 640 -192 512 -192
WIRE 704 -192 640 -192
WIRE 288 -160 288 -192
WIRE 512 -160 512 -192
WIRE 352 -128 352 -192
WIRE 512 -16 512 -80
WIRE 512 0 512 -16
WIRE 80 16 48 16
WIRE 288 16 288 -80
WIRE 288 16 144 16
WIRE 336 16 288 16
WIRE 352 16 352 -64
WIRE 352 16 336 16
WIRE 368 16 352 16
WIRE 464 16 448 16
WIRE 288 32 288 16
WIRE 704 32 704 -192
WIRE 16 112 0 112
WIRE 48 112 48 16
WIRE 48 112 16 112
WIRE 288 144 288 112
WIRE 288 144 224 144
WIRE 352 144 288 144
WIRE 480 144 432 144
WIRE 512 144 512 96
WIRE 512 144 480 144
WIRE 544 144 512 144
WIRE 560 144 544 144
WIRE 704 144 704 112
WIRE 704 144 640 144
WIRE 288 160 288 144
WIRE 0 176 0 112
WIRE 512 192 512 144
WIRE 704 192 704 144
WIRE 704 192 672 192
WIRE 672 208 672 192
WIRE 0 272 0 256
WIRE 48 272 48 112
WIRE 80 272 48 272
WIRE 288 272 288 240
WIRE 288 272 144 272
WIRE 336 272 288 272
WIRE 352 272 336 272
WIRE 368 272 352 272
WIRE 464 272 448 272
WIRE 224 304 224 144
WIRE 512 304 512 288
WIRE 704 336 704 192
WIRE 352 352 352 272
WIRE 288 368 288 272
WIRE 512 368 512 304
WIRE 224 400 224 368
WIRE 288 480 288 448
WIRE 352 480 352 416
WIRE 352 480 288 480
WIRE 512 480 512 448
WIRE 512 480 352 480
WIRE 704 480 704 416
WIRE 704 480 512 480
FLAG 672 208 0
FLAG 480 144 Drain
FLAG 512 -16 Sp
FLAG 512 304 Sn
FLAG 336 16 Gp
FLAG 336 272 Gn
FLAG 640 -192 +Ub
FLAG 544 144 out
FLAG 16 112 in
FLAG 224 400 0
FLAG 0 272 0
DATAFLAG 0 112 ""
SYMBOL nmos 464 192 R0
SYMATTR InstName Mn
SYMATTR Value IRFP240
SYMBOL pmos 464 96 M180
WINDOW 123 56 4 Left 2
SYMATTR InstName Mp
SYMATTR Value IRFP9240
SYMATTR Value2 m=n
SYMBOL Misc\\EuropeanResistor 496 -176 R0
SYMATTR InstName R1
SYMATTR Value {390m/n}
SYMBOL Misc\\EuropeanResistor 496 464 M180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R2
SYMATTR Value 270m
SYMBOL Misc\\EuropeanResistor 464 0 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R3
SYMATTR Value {100/n}
SYMBOL Misc\\EuropeanResistor 464 256 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100R
SYMBOL Misc\\EuropeanResistor 448 128 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL voltage 704 16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 60
SYMBOL Misc\\EuropeanResistor 272 16 R0
SYMATTR InstName R6
SYMATTR Value 1.2Meg
SYMBOL Misc\\EuropeanResistor 272 144 R0
SYMATTR InstName R7
SYMATTR Value 1.2Meg
SYMBOL Misc\\EuropeanResistor 272 -176 R0
SYMATTR InstName R8
SYMATTR Value 91k
SYMBOL Misc\\EuropeanResistor 272 352 R0
SYMATTR InstName R9
SYMATTR Value 91k
SYMBOL cap 144 0 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value 100n
SYMATTR SpiceLine V=100
SYMBOL cap 144 256 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 100n
SYMBOL voltage 0 160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -31 154 Left 2
SYMATTR Value SINE(0 {Uin} 400)
SYMATTR InstName V2
SYMBOL Misc\\EuropeanResistor 544 160 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName Rl
SYMATTR Value {Rl}
SYMBOL zener 336 -64 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value BZX84C6V2L
SYMBOL zener 336 416 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value BZX84C6V2L
SYMBOL voltage 704 320 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 60
SYMBOL cap 240 368 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C1
SYMATTR Value 10µ
SYMATTR SpiceLine V=100
TEXT 584 112 Left 2 ;Speaker
TEXT 64 -136 Left 2 !.lib irfp9240.lib
TEXT 456 -280 Left 2 ;.step dec param Uin .18 1.8 1\n.step param Rl list 20 8 1m
TEXT 272 -280 Left 2 !.temp 15 65
TEXT 456 -320 Left 2 !.param Rl 20
TEXT 456 -336 Left 2 !.step dec param Uin 0.018 1.8 1
TEXT 272 -304 Left 2 !.tran 0 60m 45m 1m
TEXT -32 344 Left 2 ;Rser=1k
TEXT 536 -48 Left 2 !.param n=1000