Version 4
SHEET 1 1220 680
WIRE 128 -32 -48 -32
WIRE 384 -32 128 -32
WIRE 128 0 128 -32
WIRE -48 16 -48 -32
WIRE 384 48 384 -32
WIRE 384 48 256 48
WIRE 128 96 128 80
WIRE 128 96 16 96
WIRE 192 96 128 96
WIRE 384 96 384 48
WIRE 464 96 384 96
WIRE 528 96 464 96
WIRE 672 96 528 96
WIRE 128 112 128 96
WIRE 320 144 256 144
WIRE 464 144 320 144
WIRE 608 144 464 144
WIRE 16 160 16 96
WIRE 128 208 128 176
WIRE 384 208 384 192
WIRE 528 208 528 192
WIRE 672 208 672 192
WIRE -48 288 -48 96
WIRE 16 288 16 240
WIRE 16 288 -48 288
WIRE 128 288 128 272
WIRE 128 288 16 288
WIRE 384 288 128 288
WIRE 528 288 384 288
WIRE 672 288 528 288
WIRE 128 304 128 288
FLAG 128 304 0
FLAG 464 96 VIN
SYMBOL npn 320 96 R0
SYMATTR InstName Q1
SYMATTR Value 2N3055
SYMBOL npn 464 96 R0
SYMATTR InstName Q2
SYMATTR Value 2N3055
SYMBOL npn 608 96 R0
SYMATTR InstName Q3
SYMATTR Value 2N3055
SYMBOL diode 112 208 R0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res 112 -16 R0
SYMATTR InstName R1
SYMATTR Value 'Poti'
SYMBOL voltage -48 0 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 368 192 R0
SYMATTR InstName R2
SYMATTR Value 0.033
SYMBOL res 512 192 R0
SYMATTR InstName R3
SYMATTR Value 0.033
SYMBOL res 656 192 R0
SYMATTR InstName R4
SYMATTR Value 0.033
SYMBOL npn 192 48 R0
SYMATTR InstName Q5
SYMATTR Value 2N3055
SYMBOL diode 112 112 R0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res 0 144 R0
SYMATTR InstName NTC1K
SYMATTR Value 'NTC'
TEXT 408 -16 Left 2 !.op
TEXT 408 48 Left 2 !.step param NTC 500 150 5
TEXT 784 128 Left 2 ;NTC 1K \n25°C=1000\n50°C=450\n65°C=300\n80°C=200\n90°C=150
TEXT 408 16 Left 2 !.step param Poti 2.2k 4.4k 200