Version 4
SHEET 1 880 680
WIRE -208 144 -208 112
WIRE -208 112 -112 112
WIRE -112 112 -112 192
WIRE -112 192 -144 192
WIRE -208 240 -208 288
WIRE -144 384 -112 384
WIRE -208 288 0 288
WIRE -208 288 -208 336
WIRE 0 288 0 384
WIRE 0 384 -32 384
WIRE 0 384 32 384
WIRE 112 384 144 384
WIRE 224 384 256 384
WIRE 416 336 416 208
WIRE 320 336 320 112
WIRE 352 112 320 112
WIRE 320 112 320 80
WIRE 416 416 416 464
WIRE 416 464 320 464
WIRE -208 464 -208 432
WIRE 320 432 320 464
WIRE 320 464 -208 464
WIRE 416 64 416 -32
WIRE 416 -32 320 -32
WIRE -208 -32 -208 0
WIRE -208 80 -208 112
WIRE -208 -32 -352 -32
WIRE -352 -32 -352 352
WIRE -352 432 -352 464
WIRE -352 464 -208 464
WIRE 320 0 320 -32
WIRE 320 -32 -208 -32
WIRE 416 208 448 208
WIRE 416 208 416 160
WIRE -352 464 -352 496
FLAG 448 208 VOUT
IOPIN 448 208 Out
FLAG -352 496 0
SYMBOL npn 352 64 R0
WINDOW 0 54 39 Left 0
WINDOW 3 54 58 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 256 336 R0
WINDOW 0 49 32 Left 0
WINDOW 3 49 56 Left 0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL npn -144 336 M0
WINDOW 0 82 34 Left 0
WINDOW 3 35 57 Left 0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL npn -144 144 M0
WINDOW 0 84 34 Left 0
WINDOW 3 37 58 Left 0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL res -16 368 R90
WINDOW 0 -24 67 VBottom 0
WINDOW 3 -29 54 VTop 0
SYMATTR InstName R1
SYMATTR Value 390R
SYMBOL voltage 128 384 R90
WINDOW 0 -32 56 VBottom 0
WINDOW 3 32 56 VTop 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 10m 1K)
SYMBOL res 240 368 R90
WINDOW 0 -17 59 VBottom 0
WINDOW 3 -22 45 VTop 0
SYMATTR InstName R2
SYMATTR Value 500R
SYMBOL res -224 -16 R0
WINDOW 0 39 49 Left 0
WINDOW 3 38 72 Left 0
SYMATTR InstName R3
SYMATTR Value 3K6
SYMBOL res 304 -16 R0
WINDOW 0 -53 48 Left 0
WINDOW 3 -53 71 Left 0
SYMATTR InstName R4
SYMATTR Value 1K8
SYMBOL res 400 320 R0
WINDOW 0 39 51 Left 0
SYMATTR InstName R5
SYMATTR Value 2K4
SYMBOL voltage -352 336 R0
WINDOW 0 -120 35 Left 0
WINDOW 3 -119 58 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName VSUPP
SYMATTR Value 5V
TEXT -356 564 Left 0 ;;op
TEXT -360 592 Left 0 ;.STEP TEMP LIST 10 20 30 40 50 60 70 80
TEXT -360 616 Left 0 !.tran 0 5m 0m