Version 4
SHEET 1 1604 1316
WIRE 688 -256 -160 -256
WIRE 832 -256 688 -256
WIRE 944 -256 832 -256
WIRE 944 -224 944 -256
WIRE -160 -176 -160 -256
WIRE 944 -112 944 -144
WIRE 688 -80 688 -256
WIRE -160 -32 -160 -96
WIRE -16 -32 -160 -32
WIRE 32 -32 -16 -32
WIRE 160 -32 112 -32
WIRE 208 -32 160 -32
WIRE 336 -32 288 -32
WIRE 480 -32 336 -32
WIRE 624 -32 480 -32
WIRE 160 -16 160 -32
WIRE 832 -16 832 -256
WIRE -160 32 -160 -32
WIRE 688 32 688 16
WIRE 768 32 688 32
WIRE 160 64 160 48
WIRE 400 64 160 64
WIRE 688 112 688 32
WIRE 720 112 688 112
WIRE 832 112 832 80
WIRE 832 112 800 112
WIRE -16 128 -16 -32
WIRE 32 128 -16 128
WIRE 160 128 96 128
WIRE 224 128 160 128
WIRE 336 128 336 -32
WIRE 336 128 288 128
WIRE -160 144 -160 112
WIRE 160 144 160 128
WIRE 400 160 400 64
WIRE 448 160 400 160
WIRE 576 160 528 160
WIRE 832 192 832 112
WIRE 576 208 576 160
WIRE 160 240 160 224
WIRE 400 240 400 160
WIRE 400 240 160 240
WIRE 576 304 576 288
WIRE 832 304 832 272
WIRE -32 640 -160 640
WIRE 96 640 16 640
WIRE -160 672 -160 640
WIRE 16 672 16 640
WIRE -32 688 -32 640
WIRE -160 784 -160 752
WIRE -32 784 -32 736
WIRE -32 784 -160 784
WIRE 16 784 16 752
WIRE 16 784 -32 784
WIRE -160 816 -160 784
WIRE -16 960 -64 960
WIRE 112 960 64 960
WIRE 160 960 112 960
WIRE 288 960 240 960
WIRE 432 960 288 960
WIRE -160 976 -160 928
WIRE 112 976 112 960
WIRE 112 1056 112 1040
WIRE 352 1056 112 1056
WIRE -160 1120 -160 1056
WIRE -64 1120 -64 960
WIRE -64 1120 -160 1120
WIRE -16 1120 -64 1120
WIRE 112 1120 48 1120
WIRE 176 1120 112 1120
WIRE 288 1120 288 960
WIRE 288 1120 240 1120
WIRE 112 1136 112 1120
WIRE 352 1152 352 1056
WIRE 400 1152 352 1152
WIRE 528 1152 480 1152
WIRE -160 1184 -160 1120
WIRE 528 1200 528 1152
WIRE 112 1232 112 1216
WIRE 352 1232 352 1152
WIRE 352 1232 112 1232
WIRE -160 1296 -160 1264
WIRE 528 1296 528 1280
FLAG -160 144 0
FLAG 832 304 0
FLAG 944 -112 0
FLAG 576 304 0
FLAG -160 816 0
FLAG 96 640 F
IOPIN 96 640 Out
FLAG 480 -32 B
FLAG 528 1296 0
FLAG 432 960 C
FLAG -160 1296 0
FLAG -160 928 0
SYMBOL Misc\\EuropeanResistor 16 -16 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 6.8k
SYMBOL Misc\\EuropeanResistor 192 -16 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1_
SYMATTR Value 6.8k
SYMBOL Misc\\EuropeanResistor 144 128 R0
SYMATTR InstName R2
SYMATTR Value 470
SYMBOL cap 144 -16 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL cap 288 112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2_
SYMATTR Value 47n
SYMBOL Misc\\EuropeanResistor -176 -192 R0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -176 16 R0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL npn 624 -80 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL npn 768 -16 R0
SYMATTR InstName Q2
SYMATTR Value BC547B
SYMBOL Misc\\EuropeanResistor 816 176 R0
SYMATTR InstName R6
SYMATTR Value 470
SYMBOL cap 96 112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 47n
SYMBOL voltage 944 -240 R0
SYMATTR InstName V1
SYMATTR Value 9
SYMBOL Misc\\EuropeanResistor 816 96 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL voltage 576 192 R0
SYMATTR InstName V2
SYMATTR Value AC 1
SYMBOL voltage -160 656 R0
SYMATTR InstName V3
SYMATTR Value AC 1
SYMBOL e 16 656 R0
SYMATTR InstName E1
SYMATTR Value Laplace = (b1*s +b2*s**2 +b3*s**3)/(1 +a1*s +a2*s**2 +a3*s**3)
SYMBOL Misc\\EuropeanResistor 432 176 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName RG
SYMATTR Value 20
SYMBOL Misc\\EuropeanResistor -32 976 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R10
SYMATTR Value 2.7k
SYMBOL Misc\\EuropeanResistor 144 976 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R10_
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor 96 1120 R0
SYMATTR InstName R9
SYMATTR Value 680
SYMBOL cap 96 976 R0
SYMATTR InstName C10
SYMATTR Value 100n
SYMBOL cap 240 1104 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C20_
SYMATTR Value 47n
SYMBOL cap 48 1104 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C20
SYMATTR Value 22n
SYMBOL voltage 528 1184 R0
SYMATTR InstName V4
SYMATTR Value AC 1
SYMBOL Misc\\EuropeanResistor 384 1168 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName RG10
SYMATTR Value 20
SYMBOL Misc\\EuropeanResistor -176 960 R0
SYMATTR InstName R40
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor -176 1168 R0
SYMATTR InstName R50
SYMATTR Value 10k
TEXT -184 -352 Left 2 ;.tran 100m startup
TEXT -184 -312 Left 2 !.ac dec 100 10 10k
TEXT -192 392 Left 2 !.param R1=6.8k R2=470 R3=5k C1=100n C2=47n ; R3=R4*R5/(R4+R5)\n \n.param b1 = C1*R3 + C1*R1 +2*C2*R3 +2*C2*R1 \n.param b2 = 2*C2*C1*R2*R3 +2*C2*C1*R1*R3 +2*C2*C1*R1*R2+ C2*C1*R1*R1+2*C2*C2*R1*R3\n.param b3 = 2*C2*C2*C1*R1*R2*R3 + C2*C2*C1*R1*R1*R3 \n.param a1 = C1*R3 + C1*R1 +2*C2*R3 +2*C2*R2 +2*C2*R1\n.param a2 = 2*C2*C1*R2*R3 +2*C2*C1*R1*R3 +2*C2*C1*R1*R2+ C2*C1*R1*R1+2*C2*C2*R1*R3 +2*C2*C2*R1*R2\n.param a3 = 2*C2*C2*C1*R1*R2*R3 + C2*C2*C1*R1*R1*R3 + C2*C2*C1*R1*R1*R2
TEXT -56 -88 Left 2 ;R3
TEXT -48 -160 Left 2 ;R3=R4*R5/(R4+R5)
LINE Normal 832 160 576 160 2
LINE Normal -80 -192 -112 -192 2
LINE Normal -80 128 -80 -192 2
LINE Normal -112 128 -80 128 2
LINE Normal -32 -64 -112 -64 2
LINE Normal -96 -80 -112 -64 2
LINE Normal -96 -48 -112 -64 2