Version 4
SHEET 1 880 1264
WIRE -384 -272 -464 -272
WIRE -256 -272 -304 -272
WIRE 176 -256 176 -272
WIRE 304 -256 304 -272
WIRE -464 -192 -464 -272
WIRE -464 -192 -512 -192
WIRE -512 -176 -512 -192
WIRE 32 -160 32 -176
WIRE 176 -160 176 -176
WIRE 304 -160 304 -176
WIRE -464 -64 -464 -192
WIRE -384 -64 -464 -64
WIRE -256 -64 -256 -272
WIRE -256 -64 -304 -64
WIRE -192 -64 -256 -64
WIRE -176 -64 -192 -64
WIRE -80 -64 -96 -64
WIRE 240 -64 -80 -64
WIRE -192 32 -192 -64
WIRE -176 32 -192 32
WIRE -80 32 -80 -64
WIRE -80 32 -96 32
WIRE -400 64 -400 16
WIRE 80 64 80 32
WIRE -272 80 -368 80
WIRE -176 80 -176 32
WIRE -176 80 -192 80
WIRE -160 80 -176 80
WIRE -96 80 -96 32
WIRE -96 80 -112 80
WIRE -80 80 -96 80
WIRE 48 80 0 80
WIRE -432 96 -480 96
WIRE 176 96 112 96
WIRE -336 112 -368 112
WIRE -272 112 -336 112
WIRE -160 112 -112 80
WIRE -160 112 -192 112
WIRE -112 112 -160 80
WIRE -80 112 -112 112
WIRE 16 112 0 112
WIRE 48 112 16 112
WIRE -400 160 -400 128
WIRE 80 160 80 128
WIRE -400 176 -400 160
WIRE -336 192 -336 112
WIRE 16 192 16 112
WIRE -480 240 -480 96
WIRE -400 240 -480 240
WIRE 176 240 176 96
WIRE 176 240 80 240
WIRE 176 304 176 240
WIRE 176 304 -448 304
WIRE -336 336 -336 288
WIRE -80 336 -336 336
WIRE 16 336 16 288
WIRE 16 336 -80 336
WIRE 144 336 16 336
WIRE -80 368 -80 336
WIRE 16 368 16 336
WIRE -400 400 -400 352
WIRE -448 416 -448 304
WIRE -432 416 -448 416
WIRE -304 432 -368 432
WIRE -480 448 -480 240
WIRE -432 448 -480 448
WIRE -80 480 -80 432
WIRE 16 480 16 448
WIRE 16 480 -80 480
WIRE 16 496 16 480
WIRE -400 528 -400 464
WIRE -128 560 -512 560
WIRE -112 560 -128 560
WIRE -16 560 -32 560
WIRE 240 560 240 -64
WIRE 240 560 -16 560
WIRE -512 640 -512 560
WIRE -128 656 -128 560
WIRE -112 656 -128 656
WIRE -16 656 -16 560
WIRE -16 656 -32 656
WIRE -512 672 -512 656
WIRE -336 688 -336 640
WIRE 144 688 144 656
WIRE -208 704 -304 704
WIRE -112 704 -112 656
WIRE -112 704 -128 704
WIRE -96 704 -112 704
WIRE -32 704 -32 656
WIRE -32 704 -48 704
WIRE -16 704 -32 704
WIRE 112 704 64 704
WIRE -368 720 -416 720
WIRE 240 720 176 720
WIRE -272 736 -304 736
WIRE -208 736 -272 736
WIRE -96 736 -48 704
WIRE -96 736 -128 736
WIRE -48 736 -96 704
WIRE -16 736 -48 736
WIRE 80 736 64 736
WIRE 112 736 80 736
WIRE -512 752 -512 720
WIRE -336 784 -336 752
WIRE 144 784 144 752
WIRE -336 800 -336 784
WIRE -272 816 -272 736
WIRE 80 816 80 736
WIRE -416 864 -416 720
WIRE -336 864 -416 864
WIRE 240 864 240 720
WIRE 240 864 144 864
WIRE -144 944 -144 912
WIRE -112 944 -144 944
WIRE 0 944 -32 944
WIRE 80 944 80 912
WIRE 80 944 0 944
WIRE 64 1024 64 992
WIRE 0 1040 0 944
WIRE 32 1040 0 1040
WIRE 144 1056 96 1056
WIRE 176 1056 144 1056
WIRE -272 1072 -272 912
WIRE 0 1072 -272 1072
WIRE 32 1072 0 1072
WIRE 0 1184 0 1072
WIRE 32 1184 0 1184
WIRE 144 1184 144 1056
WIRE 144 1184 112 1184
FLAG 80 32 V+
FLAG -400 16 V+
FLAG 16 496 0
FLAG 32 -160 0
FLAG 32 -256 V+
FLAG -512 -176 0
FLAG -512 752 0
FLAG 144 336 Vmeas
FLAG 176 -160 0
FLAG 176 -272 V-
FLAG -400 528 0
FLAG -400 352 V+
FLAG -304 432 Vsign
FLAG -400 160 V-
FLAG 80 160 V-
FLAG 144 656 V+
FLAG -336 640 V+
FLAG 176 1056 Vmeas2
FLAG 64 1088 V+
FLAG -336 784 V-
FLAG 144 784 V-
FLAG 304 -160 0
FLAG 304 -272 VrefADC
FLAG -144 912 VrefADC
FLAG 64 992 V-
SYMBOL res -176 64 R90
WINDOW 0 -1 113 VBottom 0
WINDOW 3 -28 60 VTop 0
SYMATTR InstName R1
SYMATTR Value 100
SYMBOL res -176 96 R90
WINDOW 0 57 101 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res 16 64 R90
WINDOW 0 -1 18 VBottom 0
WINDOW 3 -29 62 VTop 0
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL res 16 96 R90
WINDOW 0 58 101 VBottom 0
WINDOW 3 34 50 VTop 0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL res -192 -48 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName Rsense
SYMATTR Value 0.6m
SYMBOL npn -400 192 R0
SYMATTR InstName Q1
SYMATTR Value BC847C
SYMBOL Opamps\\LM358 80 32 R0
WINDOW 3 11 103 Left 0
SYMATTR InstName U1
SYMBOL Opamps\\LM358 -400 32 M0
WINDOW 3 2 105 Left 0
SYMATTR InstName U2
SYMBOL npn 80 192 M0
SYMATTR InstName Q2
SYMATTR Value BC847C
SYMBOL res 0 352 R0
SYMATTR InstName R7
SYMATTR Value {5k/0.6}
SYMBOL cap -96 368 R0
SYMATTR InstName C2
SYMATTR Value 1p
SYMBOL voltage 32 -272 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -15 58 Left 0
WINDOW 3 34 54 Left 0
SYMATTR InstName V1
SYMATTR Value 12V
SYMBOL current -384 -64 R270
WINDOW 0 24 88 Left 0
WINDOW 3 72 -144 VRight 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I2
SYMATTR Value SINE(0 5 10Hz)
SYMBOL voltage -512 624 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vbatt
SYMATTR Value 12
SYMBOL voltage 176 -160 R180
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -15 58 Left 0
WINDOW 3 -75 53 Left 0
SYMATTR InstName V2
SYMATTR Value 0.7
SYMBOL Opamps\\LM358 -400 368 R0
WINDOW 3 2 105 Left 0
SYMATTR InstName U3
SYMBOL current -384 -272 R270
WINDOW 0 24 88 Left 0
WINDOW 3 24 60 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value 0
SYMBOL res -112 688 R90
WINDOW 0 -1 113 VBottom 0
WINDOW 3 -28 60 VTop 0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL res -112 720 R90
WINDOW 0 57 101 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R6
SYMATTR Value 100
SYMBOL res 80 688 R90
WINDOW 0 -1 18 VBottom 0
WINDOW 3 -29 62 VTop 0
SYMATTR InstName R8
SYMATTR Value 100
SYMBOL res 80 720 R90
WINDOW 0 58 101 VBottom 0
WINDOW 3 34 50 VTop 0
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL npn -336 816 R0
SYMATTR InstName Q3
SYMATTR Value BC847C
SYMBOL Opamps\\LM358 144 656 R0
WINDOW 3 11 103 Left 0
SYMATTR InstName U4
SYMBOL npn 144 816 M0
SYMATTR InstName Q4
SYMATTR Value BC847C
SYMBOL Opamps\\LM358 64 1120 M180
WINDOW 3 2 105 Left 0
SYMATTR InstName U6
SYMBOL res -16 928 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R10
SYMATTR Value {2.5k/0.6}
SYMBOL res 128 1168 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R11
SYMATTR Value {2k5/0.6}
SYMBOL res -128 576 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName Rsense1
SYMATTR Value 0.6m
SYMBOL voltage 304 -272 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -14 55 Left 0
WINDOW 3 33 59 Left 0
SYMATTR InstName V3
SYMATTR Value 2.5V
SYMBOL Opamps\\LT1056 -336 656 M0
SYMATTR InstName U7
TEXT -192 -256 Left 0 !.tran 110ms