Version 4
SHEET 1 880 680
WIRE -224 -16 -304 -16
WIRE -64 -16 -224 -16
WIRE 256 -16 -64 -16
WIRE 352 -16 256 -16
WIRE 496 -16 352 -16
WIRE -304 16 -304 -16
WIRE -224 16 -224 -16
WIRE -64 16 -64 -16
WIRE 256 32 256 -16
WIRE 352 112 352 -16
WIRE 496 128 496 -16
WIRE 256 160 256 112
WIRE 288 160 256 160
WIRE -64 176 -64 96
WIRE 0 176 -64 176
WIRE 112 176 80 176
WIRE 256 176 256 160
WIRE 352 224 352 208
WIRE 432 224 352 224
WIRE 496 224 496 208
WIRE 496 224 432 224
WIRE 352 256 352 224
WIRE -64 320 -64 176
WIRE -16 320 -64 320
WIRE 112 320 112 176
WIRE 112 320 48 320
WIRE 192 320 112 320
WIRE 256 320 256 256
WIRE 256 320 192 320
WIRE -64 352 -64 320
WIRE 112 352 112 320
WIRE 352 368 352 336
WIRE -224 528 -224 96
WIRE -64 528 -64 432
WIRE -64 528 -224 528
WIRE 112 528 112 432
WIRE 112 528 -64 528
WIRE 352 528 352 448
WIRE 352 528 112 528
FLAG -304 16 0
FLAG 192 320 hih_out
FLAG 432 224 c
FLAG 256 160 b
SYMBOL voltage 96 176 R90
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 0 38 1 VRight 2
WINDOW 3 383 -141 VRight 2
SYMATTR InstName V1
SYMATTR Value PULSE(0.5 2.5 0 10 0.1 1 12 1)
SYMBOL pnp 288 208 M180
SYMATTR InstName Q1
SYMATTR Value BC557C
SYMBOL Misc\\EuropeanResistor 336 240 R0
SYMATTR InstName R1
SYMATTR Value 51K
SYMBOL Misc\\EuropeanResistor 480 112 R0
SYMATTR InstName R2
SYMATTR Value 4K7
SYMBOL Misc\\EuropeanResistor 336 352 R0
SYMATTR InstName R3
SYMATTR Value 22K
SYMBOL voltage -224 0 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 13
SYMBOL Misc\\EuropeanResistor 128 448 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R4
SYMATTR Value 330K
SYMBOL voltage -64 0 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 3.3
SYMBOL Misc\\EuropeanResistor 272 272 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R5
SYMATTR Value 120K
SYMBOL Misc\\EuropeanResistor 272 128 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R6
SYMATTR Value 68K
SYMBOL Misc\\EuropeanResistor -48 448 R180
WINDOW 0 31 76 Left 2
WINDOW 3 31 40 Left 2
SYMATTR InstName R7
SYMATTR Value 820
SYMBOL diode -16 336 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
TEXT 456 560 Left 2 !.tran 10
TEXT -144 104 Left 2 ;TL431
TEXT -312 104 Left 2 ;LM317
TEXT 8 256 Left 2 ;HIH5031
TEXT 360 464 Left 2 ;NTC22K@25RT
TEXT -168 136 Left 2 ;8K2 2K7
TEXT 264 560 Left 2 !.step temp 5 20