Version 4
SHEET 1 880 680
WIRE -400 368 -400 336
WIRE -400 480 -400 448
WIRE -288 336 -400 336
WIRE -288 368 -288 336
WIRE -288 464 -288 448
WIRE -240 336 -288 336
WIRE -176 32 -176 -48
WIRE -176 160 -176 112
WIRE -176 288 -176 160
WIRE -176 448 -176 384
WIRE -160 160 -176 160
WIRE -128 448 -176 448
WIRE -96 -48 -176 -48
WIRE -96 112 -96 -48
WIRE -96 240 -96 208
WIRE -96 496 -96 480
WIRE -32 496 -96 496
WIRE 80 -48 -96 -48
WIRE 80 -32 80 -48
WIRE 80 64 80 48
WIRE 80 112 80 64
WIRE 80 240 -96 240
WIRE 80 240 80 208
WIRE 80 288 80 240
WIRE 80 496 48 496
WIRE 80 496 80 368
WIRE 176 -48 80 -48
WIRE 176 -32 176 -48
WIRE 176 160 144 160
WIRE 176 160 176 48
WIRE 176 288 176 160
WIRE 176 448 -64 448
WIRE 176 448 176 384
WIRE 208 64 80 64
WIRE 208 80 208 64
WIRE 208 160 208 144
WIRE 208 256 208 240
WIRE 256 336 240 336
WIRE 256 368 256 336
WIRE 256 464 256 448
WIRE 272 64 208 64
WIRE 272 96 272 64
WIRE 272 176 272 160
WIRE 320 64 272 64
WIRE 352 64 320 64
WIRE 352 80 352 64
WIRE 352 176 272 176
WIRE 352 176 352 160
WIRE 352 208 352 176
WIRE 352 496 80 496
WIRE 352 496 352 288
WIRE 368 336 256 336
WIRE 400 176 352 176
WIRE 464 -48 176 -48
WIRE 464 0 464 -48
WIRE 464 112 464 80
WIRE 464 128 464 112
WIRE 464 384 464 224
WIRE 512 112 464 112
WIRE 512 336 448 336
WIRE 512 336 512 112
WIRE 560 -48 464 -48
WIRE 560 176 560 -48
WIRE 560 272 560 256
WIRE 560 288 560 272
WIRE 560 384 464 384
WIRE 560 384 560 368
WIRE 560 400 560 384
WIRE 560 496 352 496
WIRE 560 496 560 480
WIRE 592 272 560 272
WIRE 592 288 592 272
FLAG 208 256 0
FLAG 592 288 0
FLAG -400 480 0
FLAG 256 464 0
FLAG -288 464 0
FLAG 512 112 Out
FLAG 320 64 PreOut
SYMBOL voltage 560 160 R0
WINDOW 0 -39 13 Left 0
WINDOW 3 -12 57 Left 0
WINDOW 123 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 24
SYMATTR SpiceLine Rser=1 Cpar=1u
SYMBOL npn2 -240 288 R0
WINDOW 0 -3 3 Left 0
WINDOW 3 24 50 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn2 240 288 M0
WINDOW 0 75 19 Left 0
WINDOW 3 21 46 Left 0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL res 64 272 R0
WINDOW 3 30 90 Left 0
SYMATTR Value 10K
SYMATTR InstName R1
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Robertugo\\Pote -160 464 R270
WINDOW 0 50 -3 VRight 0
WINDOW 3 -17 -29 VRight 0
WINDOW 123 49 68 VCenter 0
SYMATTR InstName U1
SYMATTR Value Rt=220
SYMBOL res -192 16 R0
SYMATTR InstName R2
SYMATTR Value 22K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 160 -48 R0
SYMATTR InstName R3
SYMATTR Value 22K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 64 -48 R0
SYMATTR InstName R4
SYMATTR Value 8K2
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 240 352 R0
SYMATTR InstName R5
SYMATTR Value 1K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL npn2 400 128 R0
WINDOW 0 58 24 Left 0
WINDOW 3 24 50 Left 0
SYMATTR InstName Q5
SYMATTR Value 2N3904
SYMBOL res 336 64 R0
SYMATTR InstName R6
SYMATTR Value 18K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL cap 256 96 R0
SYMATTR InstName C1
SYMATTR Value 180p
SYMBOL cap 192 80 R0
SYMATTR InstName C2
SYMATTR Value 33n
SYMBOL res 192 144 R0
SYMATTR InstName R7
SYMATTR Value 27
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 336 192 R0
SYMATTR InstName R8
SYMATTR Value 12K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 448 -16 R0
SYMATTR InstName R9
SYMATTR Value 10K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 464 320 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName RFB
SYMATTR Value 1e5
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage 560 272 R0
WINDOW 0 -35 4 Left 0
WINDOW 3 -12 57 Left 0
WINDOW 123 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12
SYMATTR SpiceLine Rser=1 Cpar=1u
SYMBOL voltage 560 384 R0
WINDOW 0 -47 16 Left 0
WINDOW 3 -12 57 Left 0
WINDOW 123 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 12
SYMATTR SpiceLine Rser=1 Cpar=1u
SYMBOL voltage -400 352 R0
WINDOW 0 -13 59 Left 0
WINDOW 3 224 153 Right 0
WINDOW 123 71 4 Right 0
SYMATTR InstName V4
SYMATTR Value SINE(0 100m {Fin})
SYMATTR Value2 AC .1
SYMATTR SpiceLine Rser=75
SYMBOL res 64 480 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R11
SYMATTR Value 15K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL npn2 -160 112 R0
WINDOW 0 -3 3 Left 0
WINDOW 3 24 50 Left 0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL npn2 144 112 M0
WINDOW 0 75 19 Left 0
WINDOW 3 25 48 Left 0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res -304 352 R0
SYMATTR InstName R12
SYMATTR Value 1K
SYMATTR SpiceLine tol=1 pwr=0.1
TEXT -392 224 Left 0 !.tran {10/Fin}
TEXT -400 176 Left 0 !.Fourier {Fin} V(Out)
TEXT -400 144 Left 0 !.option noopiter
TEXT 200 520 Left 0 !.step param Fin List 1k 10k 50k 100k
TEXT -384 88 Left 0 ;.param Fin=1e3