Version 4
SHEET 1 1940 680
WIRE -48 -144 -64 -144
WIRE 96 -144 32 -144
WIRE 192 -144 96 -144
WIRE 256 -144 192 -144
WIRE 704 -64 704 -80
WIRE 816 -64 816 -80
WIRE 1104 -64 1104 -80
WIRE 96 -48 96 -64
WIRE 256 0 256 -144
WIRE 1280 16 1280 0
WIRE 1360 16 1280 16
WIRE 1280 32 1280 16
WIRE 96 48 96 32
WIRE 192 48 96 48
WIRE 96 64 96 48
WIRE 528 64 496 64
WIRE 656 64 608 64
WIRE 704 64 704 16
WIRE 704 64 656 64
WIRE 816 64 816 16
WIRE 880 64 816 64
WIRE 1024 64 960 64
WIRE 1104 64 1104 16
WIRE 1104 64 1024 64
WIRE 1232 64 1104 64
WIRE 1360 64 1360 16
WIRE 1440 64 1360 64
WIRE -336 128 -368 128
WIRE -192 128 -256 128
WIRE -144 128 -192 128
WIRE -32 128 -80 128
WIRE 48 128 -32 128
WIRE 256 128 256 96
WIRE 320 128 256 128
WIRE 432 128 496 64
WIRE 432 128 384 128
WIRE 1280 128 1200 128
WIRE 1504 128 1440 64
WIRE 1568 128 1504 128
WIRE 1712 128 1632 128
WIRE 1760 128 1712 128
WIRE -368 176 -368 128
WIRE -32 192 -32 128
WIRE 96 192 96 160
WIRE 256 192 256 128
WIRE 528 192 496 192
WIRE 656 192 608 192
WIRE 704 192 656 192
WIRE 880 192 816 192
WIRE 1024 192 960 192
WIRE 1360 192 1024 192
WIRE 1440 192 1360 192
WIRE 1760 192 1760 128
WIRE 704 240 704 192
WIRE 816 240 816 192
WIRE 1360 240 1360 192
WIRE -368 304 -368 256
WIRE -32 304 -32 272
WIRE 96 304 96 272
WIRE 256 304 256 272
WIRE 1760 320 1760 272
WIRE 704 336 704 320
WIRE 816 336 816 320
WIRE 1360 336 1360 320
FLAG -368 304 0
FLAG -64 -144 0
FLAG 704 -80 0
FLAG 704 336 0
FLAG 816 336 0
FLAG 816 -80 0
FLAG 656 64 f1_in
FLAG 656 192 f2_in
FLAG 1024 64 f1_out
FLAG 1024 192 f2_out
FLAG 1760 320 0
FLAG 1360 336 0
FLAG 1712 128 zf_in
FLAG 1104 -80 0
FLAG 192 -144 5V
FLAG 1200 128 5V
IOPIN 1200 128 In
FLAG 1280 -80 0
FLAG -32 304 0
FLAG 96 304 0
FLAG 256 304 0
FLAG -192 128 mix
SYMBOL res -240 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 34k
SYMATTR SpiceLine ""
SYMBOL npn 192 0 R0
SYMATTR InstName Q1
SYMATTR Value BF199
SYMBOL res 272 176 M0
SYMATTR InstName R2
SYMATTR Value 470
SYMATTR SpiceLine ""
SYMBOL voltage -368 160 M0
WINDOW 3 -120 99 Left 2
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(0 100m 445k)
SYMATTR Value2 AC 2
SYMATTR SpiceLine ""
SYMBOL voltage 48 -144 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5V
SYMATTR Value2 ""
SYMATTR SpiceLine ""
SYMBOL cap 384 112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100n
SYMATTR SpiceLine ""
SYMBOL res 624 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 3k
SYMATTR SpiceLine ""
SYMBOL res 624 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 39
SYMATTR SpiceLine ""
SYMBOL cap -144 112 M90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 1n
SYMATTR SpiceLine ""
SYMBOL res 688 -80 R0
SYMATTR InstName R6
SYMATTR Value 3k
SYMATTR SpiceLine ""
SYMBOL res 688 224 R0
SYMATTR InstName R7
SYMATTR Value 50
SYMATTR SpiceLine ""
SYMBOL res 976 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Ri1
SYMATTR Value 3k
SYMATTR SpiceLine ""
SYMBOL res 976 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Ri2
SYMATTR Value 50
SYMATTR SpiceLine ""
SYMBOL bv 816 32 M180
WINDOW 0 24 96 Left 2
WINDOW 3 35 63 Left 2
SYMATTR InstName B1
SYMATTR Value V = v(f1_in)
SYMBOL bv 816 224 R0
SYMATTR InstName B2
SYMATTR Value V = v(f2_in)*1.4
SYMBOL res 1344 224 R0
SYMATTR InstName R8
SYMATTR Value 56
SYMATTR SpiceLine ""
SYMBOL res 1744 176 R0
SYMATTR InstName R9
SYMATTR Value 1.25k
SYMATTR SpiceLine ""
SYMBOL res 1088 -80 R0
SYMATTR InstName R10
SYMATTR Value 3k
SYMATTR SpiceLine ""
SYMBOL njf 48 64 R0
WINDOW 0 -34 38 Left 2
WINDOW 3 -39 97 Left 2
SYMATTR InstName J1
SYMATTR Value 2N3819
SYMBOL res -48 176 R0
SYMATTR InstName R11
SYMATTR Value 220k
SYMATTR SpiceLine ""
SYMBOL ind 80 -64 R0
SYMATTR InstName L1
SYMATTR Value 100µ
SYMATTR SpiceLine Rser=1 Rpar=100k
SYMBOL res 80 -160 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMATTR SpiceLine ""
SYMBOL res 80 176 R0
SYMATTR InstName R12
SYMATTR Value 33
SYMATTR SpiceLine ""
SYMBOL njf 1232 128 M180
WINDOW 0 -34 38 Left 2
WINDOW 3 -39 97 Left 2
SYMATTR InstName J2
SYMATTR Value 2N3819
SYMBOL res 1264 -96 R0
SYMATTR InstName R13
SYMATTR Value 1k
SYMATTR SpiceLine ""
SYMBOL cap 1632 112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 100n
SYMATTR SpiceLine ""
TEXT -422 -16 Left 2 !.tran 0 100u 0 10n
TEXT 696 376 Left 2 ;Ladderfilter
TEXT 728 -120 Left 2 ;LTU455
LINE Normal 432 416 432 144 2
LINE Normal 1504 416 432 416 2
LINE Normal 1504 144 1504 416 2