Version 4
SHEET 1 1472 2100
WIRE 592 32 592 0
WIRE 560 48 224 48
WIRE 720 64 624 64
WIRE 560 80 272 80
WIRE 592 128 592 96
WIRE 800 176 800 144
WIRE -192 192 -224 192
WIRE 96 224 64 224
WIRE 384 224 176 224
WIRE 560 224 384 224
WIRE 720 224 720 64
WIRE 720 224 640 224
WIRE -224 256 -224 192
WIRE 384 272 384 224
WIRE 64 336 64 224
WIRE 96 336 64 336
WIRE 224 336 224 48
WIRE 224 336 176 336
WIRE 336 336 224 336
WIRE 800 336 800 256
WIRE 800 336 432 336
WIRE 864 336 800 336
WIRE 1104 336 1104 304
WIRE 1232 336 1232 304
WIRE -224 400 -224 336
WIRE 64 448 64 336
WIRE 64 448 -16 448
WIRE 96 448 64 448
WIRE 272 448 272 80
WIRE 272 448 176 448
WIRE 1104 448 1104 416
WIRE 1104 448 272 448
WIRE 1232 448 1232 416
WIRE 1232 448 1104 448
FLAG -224 400 0
FLAG -192 192 -V
IOPIN -192 192 Out
FLAG 1104 304 0
FLAG 864 336 CM
IOPIN 864 336 Out
FLAG 800 144 0
FLAG -16 448 -V
IOPIN -16 448 In
FLAG 592 0 0
FLAG 592 128 VB
FLAG 1232 304 0
SYMBOL Misc\\battery -224 240 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 132 Left 0
SYMATTR SpiceLine Rser=0
SYMATTR InstName V1
SYMATTR Value -9
SYMBOL res 192 432 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value .1
SYMBOL res 1088 320 R0
SYMATTR InstName R29
SYMATTR Value 1meg
SYMBOL res 192 320 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res 784 160 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 544 240 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 2k
SYMBOL npn 432 272 R90
WINDOW 0 35 -34 VRight 0
WINDOW 3 80 11 VRight 0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL current 1232 336 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 116 Left 0
SYMATTR SpiceLine load
SYMATTR InstName I1
SYMATTR Value PWL(0 0 100m 1)
SYMBOL res 80 240 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R5
SYMATTR Value 2k
SYMBOL Robertugo\\OPAMP5 592 0 R0
SYMATTR InstName U1
SYMATTR SpiceModel LM324
TEXT -240 -8 Left 0 !.tran .1
TEXT -240 88 Left 0 !.step V1 list -9 -10
TEXT 752 384 Left 0 ;0V @ ILOAD=0
TEXT 144 -128 Left 0 ;Excellent common mode suppression, no precision resistors required\n \nSingle supply opamps like the LM358 or LM324 are possible if their offset voltage is sufficient.
TEXT -240 24 Left 0 !.options plotwinsize=0