Version 4
SHEET 1 880 1064
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 -208 288 -112 288
WIRE -208 288 -208 336
WIRE -112 288 -112 384
WIRE -112 384 256 384
WIRE 416 336 416 208
WIRE 320 336 320 112
WIRE 352 112 320 112
WIRE 320 112 320 80
WIRE 416 416 416 896
WIRE 416 896 320 896
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 -352 896
WIRE 320 0 320 -32
WIRE 320 -32 -208 -32
WIRE 416 208 448 208
WIRE 416 208 416 160
WIRE -352 896 -352 928
WIRE 320 768 320 784
WIRE 320 864 320 896
WIRE 320 896 -208 896
WIRE -208 784 -208 432
WIRE -208 864 -208 896
WIRE -208 896 -352 896
WIRE 320 688 320 656
WIRE 320 576 320 432
WIRE -144 384 -112 384
FLAG 448 208 VOUT
IOPIN 448 208 Out
FLAG -352 928 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 -192 880 R180
WINDOW 0 51 66 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R1
SYMATTR Value 1K5
SYMBOL voltage 320 768 R0
WINDOW 0 -211 41 Left 0
WINDOW 3 -211 65 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 10m 1K)
SYMBOL res 304 672 R0
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 220K
SYMBOL res 304 -16 R0
WINDOW 0 -53 48 Left 0
WINDOW 3 -53 71 Left 0
SYMATTR InstName R4
SYMATTR Value 110K
SYMBOL res 400 320 R0
WINDOW 0 39 51 Left 0
SYMATTR InstName R5
SYMATTR Value 200K
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
SYMBOL res 304 560 R0
SYMATTR InstName R6
SYMATTR Value 1K
TEXT -356 996 Left 0 !.op
TEXT -360 1024 Left 0 !.STEP TEMP LIST 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75
TEXT -360 1048 Left 0 !.tran 0 5m 0m