Version 4 SHEET 1 1764 840 WIRE -368 -64 -608 -64 WIRE -64 -64 -368 -64 WIRE 48 -64 -64 -64 WIRE 288 -64 48 -64 WIRE 480 -64 288 -64 WIRE -608 -32 -608 -64 WIRE -368 -32 -368 -64 WIRE 48 -16 48 -64 WIRE 288 0 288 -64 WIRE -608 80 -608 48 WIRE -544 80 -608 80 WIRE -496 80 -544 80 WIRE -288 80 -496 80 WIRE -128 80 -208 80 WIRE -16 96 -64 96 WIRE 48 96 48 64 WIRE 48 96 -16 96 WIRE -608 112 -608 80 WIRE -128 112 -160 112 WIRE 288 112 288 80 WIRE -368 192 -368 48 WIRE -320 192 -368 192 WIRE -288 192 -320 192 WIRE -160 192 -160 112 WIRE -160 192 -208 192 WIRE -128 192 -160 192 WIRE 48 192 48 96 WIRE 48 192 -48 192 WIRE 112 192 48 192 WIRE 240 192 192 192 WIRE -496 224 -496 80 WIRE -608 240 -608 192 WIRE -368 304 -368 192 WIRE 480 320 480 -64 WIRE -608 432 -608 320 WIRE -496 432 -496 288 WIRE -496 432 -608 432 WIRE -368 432 -368 384 WIRE -368 432 -496 432 WIRE 288 432 288 208 WIRE 288 432 -368 432 WIRE 480 432 480 400 WIRE 480 432 288 432 WIRE 480 448 480 432 WIRE -608 464 -608 432 FLAG -96 128 0 FLAG -96 64 +V FLAG -64 -64 +V IOPIN -64 -64 In FLAG -608 464 0 FLAG -16 96 Vcomp FLAG -544 80 Vset FLAG 480 448 0 FLAG -320 192 THntc SYMBOL res -32 176 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R8 SYMATTR Value 1meg SYMBOL res -384 -48 R0 SYMATTR InstName R2 SYMATTR Value 22k SYMBOL res -624 -48 R0 SYMATTR InstName R6 SYMATTR Value 22k SYMBOL res -624 96 R0 SYMATTR InstName R9 SYMATTR Value 24k5 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL res -624 224 R0 SYMATTR InstName R10 SYMATTR Value 100 SYMBOL res -192 176 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 30 13 VTop 0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL res -192 64 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R7 SYMATTR Value 10k SYMBOL cap -512 224 R0 SYMATTR InstName C1 SYMATTR Value 1µ SYMBOL Misc\\battery 480 304 R0 SYMATTR InstName V1 SYMATTR Value 12v SYMBOL voltage -368 288 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value PWL(0 6.5 .1 6. .2 6.5 .3 6.) SYMBOL res 32 -32 R0 SYMATTR InstName R12 SYMATTR Value 4k7 SYMBOL res 272 -16 R0 SYMATTR InstName Heater SYMATTR Value 12 SYMBOL XOPAMP -96 32 R0 WINDOW 38 2 118 Left 0 SYMATTR SpiceModel LM393A SYMATTR InstName U1 SYMBOL nmos 240 112 R0 SYMATTR InstName M1 SYMATTR Value FDR4420A SYMBOL res 208 176 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R4 SYMATTR Value 1k TEXT -576 456 Left 0 !.tran 0 .3 0 1m startup uic TEXT -712 152 Left 0 ;20Kpot TEXT -704 280 Left 0 ;2Kpot TEXT -320 344 Left 0 ;Therm Sim TEXT -224 456 Left 0 !.INCLUDE LM393A.5_1_ti.mod