Version 4
SHEET 1 1328 988
WIRE 256 48 -256 48
WIRE 464 48 256 48
WIRE 256 128 256 48
WIRE 464 128 464 48
WIRE 32 160 -16 160
WIRE 192 176 96 176
WIRE 400 176 192 176
WIRE 32 192 -128 192
WIRE -256 256 -256 48
WIRE -128 256 -128 192
WIRE -16 256 -16 160
WIRE 256 256 256 224
WIRE 256 256 -16 256
WIRE 304 256 256 256
WIRE 464 256 464 224
WIRE 528 256 464 256
WIRE 256 288 256 256
WIRE 464 288 464 256
WIRE -256 400 -256 336
WIRE -128 400 -128 336
WIRE -128 400 -256 400
WIRE 256 400 256 368
WIRE 256 400 -128 400
WIRE 464 400 464 368
WIRE 464 400 256 400
WIRE -256 416 -256 400
WIRE 128 464 96 464
WIRE 240 464 208 464
WIRE -96 496 -224 496
WIRE -224 544 -224 496
WIRE -192 544 -224 544
WIRE -96 560 -96 496
WIRE -96 560 -128 560
WIRE -32 560 -96 560
WIRE 96 560 96 464
WIRE 96 560 48 560
WIRE 128 560 96 560
WIRE 240 560 240 464
WIRE 240 560 208 560
WIRE 272 560 240 560
WIRE 384 560 352 560
WIRE 496 560 464 560
WIRE -192 576 -224 576
WIRE 240 656 240 560
WIRE 336 656 240 656
WIRE 496 672 496 560
WIRE 496 672 400 672
WIRE 528 672 496 672
WIRE -96 688 -224 688
WIRE -48 688 -96 688
WIRE 336 688 32 688
WIRE -224 736 -224 688
WIRE -192 736 -224 736
WIRE -96 752 -96 688
WIRE -96 752 -128 752
WIRE -192 768 -224 768
FLAG -256 416 0
FLAG 528 256 outy
FLAG 528 672 out
IOPIN 528 672 Out
FLAG -224 576 outy
FLAG -224 768 outx
FLAG 304 256 outx
FLAG -128 192 0V15
SYMBOL npn 192 128 R0
SYMATTR InstName Q1
SYMBOL npn 400 128 R0
SYMATTR InstName Q2
SYMBOL res 448 272 R0
SYMATTR InstName RR
SYMATTR Value 10k
SYMBOL res 240 272 R0
SYMATTR InstName RX
SYMATTR Value {RX}
SYMBOL Opamps\\opamp 64 112 R0
SYMATTR InstName U1
SYMBOL voltage -128 240 R0
SYMATTR InstName V1
SYMATTR Value 0.15
SYMBOL voltage -256 240 R0
SYMATTR InstName V2
SYMATTR Value 3.3
SYMBOL Opamps\\opamp 368 608 R0
SYMATTR InstName U2
SYMBOL res 256 576 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL Opamps\\opamp -160 496 R0
SYMATTR InstName U4
SYMBOL Opamps\\opamp -160 688 R0
SYMATTR InstName U3
SYMBOL res 48 672 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res 64 544 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName RPT1000
SYMATTR Value 1k Tc1=0.003850
SYMBOL res 112 576 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL res 112 480 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 368 576 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value 1k
TEXT -240 -88 Left 2 !.step dec param RX 1k 1Meg 10\n.step TEMP list 0 20 40
TEXT -240 -120 Left 2 !.op
TEXT -240 -16 Left 2 !.lib opamp.sub