Version 4
SHEET 1 2356 752
WIRE 144 -304 -64 -304
WIRE 288 -304 240 -304
WIRE 432 -304 368 -304
WIRE -64 -192 -64 -304
WIRE 144 -192 -64 -192
WIRE 288 -192 240 -192
WIRE 432 -192 432 -304
WIRE 432 -192 368 -192
WIRE 1664 -144 1664 -160
WIRE 1744 -144 1744 -160
WIRE 192 -128 192 -240
WIRE -64 -32 -64 -192
WIRE -64 -32 -336 -32
WIRE 48 -32 -64 -32
WIRE 192 -32 192 -128
WIRE 192 -32 144 -32
WIRE 240 -32 192 -32
WIRE 432 -32 432 -192
WIRE 432 -32 320 -32
WIRE 608 -32 432 -32
WIRE 896 -32 608 -32
WIRE 1424 -32 896 -32
WIRE 1568 -32 1504 -32
WIRE 1664 -32 1664 -64
WIRE 1664 -32 1568 -32
WIRE 1744 -32 1744 -64
WIRE 1744 -32 1664 -32
WIRE 1792 -32 1744 -32
WIRE 1840 -32 1792 -32
WIRE 1840 -16 1840 -32
WIRE 1440 32 192 32
WIRE -336 48 -336 -32
WIRE -128 96 -144 96
WIRE 96 96 96 32
WIRE 96 96 -48 96
WIRE 192 96 192 32
WIRE 192 96 96 96
WIRE 1440 96 1440 32
WIRE 1200 112 1088 112
WIRE 1280 112 1264 112
WIRE 608 192 608 -32
WIRE 1088 208 1088 112
WIRE 1104 208 1088 208
WIRE 1200 208 1184 208
WIRE 1280 208 1280 112
WIRE 1280 208 1264 208
WIRE 1440 208 1440 160
WIRE 1440 208 1280 208
WIRE 1568 256 1568 -32
WIRE 1664 256 1664 -32
WIRE 1744 256 1744 -32
WIRE 1792 256 1792 -32
WIRE 896 320 896 -32
WIRE 944 320 896 320
WIRE 1088 320 1088 208
WIRE 1088 320 1024 320
WIRE 1136 320 1088 320
WIRE 1136 352 1136 320
WIRE 1216 352 1136 352
WIRE 1344 368 1280 368
WIRE 1440 368 1440 208
WIRE 1440 368 1424 368
WIRE 1216 384 1136 384
WIRE 848 416 768 416
WIRE 960 416 928 416
WIRE 1008 416 960 416
WIRE 1136 416 1136 384
WIRE 1136 416 1088 416
WIRE 1440 432 1440 368
WIRE 768 448 768 416
WIRE 960 448 960 416
WIRE 768 544 768 528
WIRE 960 544 960 528
WIRE 1440 544 1440 512
WIRE -336 592 -336 128
WIRE 608 592 608 272
WIRE 608 592 -336 592
WIRE 1568 592 1568 320
WIRE 1568 592 608 592
WIRE 1664 592 1664 320
WIRE 1664 592 1568 592
WIRE 1744 592 1744 320
WIRE 1744 592 1664 592
WIRE 1792 592 1792 336
WIRE 1792 592 1744 592
FLAG -144 96 +12
FLAG 1840 -16 0
FLAG 1744 -160 +12
FLAG 1664 -160 -12
FLAG 768 544 0
FLAG 1248 336 +12
FLAG 1248 400 -12
FLAG 1440 368 x
FLAG 1440 544 0
FLAG 960 544 0
SYMBOL voltage -336 32 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 124 Left 2
SYMATTR InstName V1
SYMATTR Value 50
SYMBOL current -128 96 R270
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value 4m
SYMBOL res 592 176 R0
SYMATTR InstName R10
SYMATTR Value 3k
SYMBOL res 1520 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 38 57 VTop 2
SYMATTR InstName R13
SYMATTR Value 0.2
SYMBOL cap 1648 256 R0
SYMATTR InstName C3
SYMATTR Value 47µ
SYMATTR SpiceLine Rser=0.08
SYMBOL res 1776 240 R0
SYMATTR InstName R14
SYMATTR Value 10
SYMBOL diode 1760 320 R180
WINDOW 0 24 64 Left 2
WINDOW 3 -16 -25 Left 2
SYMATTR InstName D5
SYMATTR Value BYV32E
SYMBOL cap 1552 256 R0
SYMATTR InstName C4
SYMATTR Value 100n
SYMBOL voltage 1744 -160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL voltage 1664 -48 R180
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 12
SYMBOL res 1040 304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 34 63 VTop 2
SYMATTR InstName R27
SYMATTR Value 1.5k
SYMBOL res 1104 400 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R28
SYMATTR Value 1.5k
SYMBOL cap 1264 192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 100p
SYMBOL diode 1424 96 R0
SYMATTR InstName D8
SYMATTR Value 1N4148
SYMBOL res 944 432 R0
SYMATTR InstName R29
SYMATTR Value 1
SYMBOL res 944 400 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R30
SYMATTR Value 7.5k
SYMBOL voltage 768 432 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V5
SYMATTR Value 5
SYMBOL voltage 1440 368 M270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
WINDOW 123 -32 56 VBottom 2
WINDOW 39 -32 56 VBottom 2
SYMATTR InstName Vi
SYMATTR Value ""
SYMATTR Value2 AC {u(-prb)}
SYMBOL current 1440 512 M180
WINDOW 0 24 77 Left 2
WINDOW 3 24 0 Left 2
WINDOW 123 37 33 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName Ii
SYMATTR Value ""
SYMATTR Value2 AC {u(prb)}
SYMBOL cap 1264 96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 63p
SYMBOL res 1200 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 2.2k
SYMBOL OpAmps\\opamp2 1248 304 R0
SYMATTR InstName U2
SYMATTR Value TL071
SYMBOL npn2 48 32 R270
SYMATTR InstName Q6
SYMATTR Value BD139_C
SYMBOL res 336 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 20
SYMBOL npn2 144 -128 R270
WINDOW 3 73 -32 Left 2
SYMATTR Value TIP3055
SYMATTR InstName Q7
SYMBOL npn2 144 -240 R270
WINDOW 3 -39 -52 Left 2
SYMATTR Value TIP3055
SYMATTR InstName Q8
SYMBOL res 384 -208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 0.22
SYMBOL res 384 -320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 0.22
TEXT -424 720 Left 2 ;-1/(1-1/(2*(I(Vi)@1*V(x)@2-V(x)@1*I(Vi)@2)+V(x)@1+I(Vi)@2))
TEXT -400 640 Left 2 ;.tran 10m
TEXT -224 472 Left 2 !.ac dec 100 1 100Meg
TEXT -224 432 Left 2 !.include TL071.301
TEXT -224 512 Left 2 !.step param prb list -1 1 ; set prb=0 to turn off probe