Version 4
SHEET 1 880 768
WIRE 64 -160 -400 -160
WIRE 208 -160 64 -160
WIRE 608 -160 208 -160
WIRE 64 -112 64 -160
WIRE 208 -112 208 -160
WIRE 64 0 64 -48
WIRE 208 0 208 -32
WIRE 480 0 208 0
WIRE 608 0 608 -160
WIRE -400 32 -400 -160
WIRE 208 32 208 0
WIRE -48 80 -176 80
WIRE 64 80 16 80
WIRE 144 80 64 80
WIRE 352 96 288 96
WIRE 608 96 608 80
WIRE 608 96 432 96
WIRE 720 96 608 96
WIRE 608 144 608 96
WIRE 208 192 208 128
WIRE 288 192 288 96
WIRE 288 192 208 192
WIRE 480 192 480 0
WIRE 544 192 480 192
WIRE -176 208 -176 80
WIRE 608 256 608 240
WIRE 752 256 608 256
WIRE 64 272 64 80
WIRE 352 272 64 272
WIRE 608 304 608 256
WIRE 752 304 752 256
WIRE 208 384 208 192
WIRE 352 416 352 272
WIRE 432 416 352 416
WIRE 608 416 608 384
WIRE 608 416 512 416
WIRE 608 448 608 416
WIRE -400 608 -400 112
WIRE -176 608 -176 288
WIRE -176 608 -400 608
WIRE 208 608 208 464
WIRE 208 608 -176 608
WIRE 608 608 608 528
WIRE 608 608 208 608
WIRE 752 608 752 368
WIRE 752 608 608 608
WIRE 608 656 608 608
FLAG 64 0 0
FLAG 608 656 0
SYMBOL npn 144 32 R0
SYMATTR InstName Q1
SYMATTR Value BC546B
SYMBOL npn 544 144 R0
SYMATTR InstName Q2
SYMATTR Value BC546B
SYMBOL Misc\\EuropeanResistor 192 368 R0
SYMATTR InstName R1
SYMATTR Value 560
SYMBOL Misc\\EuropeanResistor 528 400 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 160k
SYMBOL Misc\\EuropeanResistor 336 112 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 47k
SYMBOL Misc\\EuropeanResistor 592 288 R0
SYMATTR InstName R4
SYMATTR Value 560
SYMBOL Misc\\EuropeanResistor 592 432 R0
SYMATTR InstName R5
SYMATTR Value 560
SYMBOL Misc\\EuropeanResistor 192 -128 R0
SYMATTR InstName R6
SYMATTR Value 68k
SYMBOL Misc\\EuropeanResistor 592 -16 R0
SYMATTR InstName R7
SYMATTR Value 2.7k
SYMBOL cap 16 64 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL cap 784 80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 1µ
SYMBOL cap 80 -48 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C3
SYMATTR Value 220µ
SYMBOL cap 768 368 R180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C4
SYMATTR Value 47µ
SYMBOL voltage -400 16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 18V
SYMBOL voltage -176 192 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 0.001 1000)
SYMATTR Value2 AC 0.001
TEXT -434 680 Left 2 !;tran 0.05
TEXT -424 752 Left 2 !.ac oct 1000 1 1meg
TEXT -136 64 Left 2 ;IN
TEXT 808 64 Left 2 ;OUT