Version 4 SHEET 1 1260 680 WIRE 576 -192 576 -208 WIRE 976 -176 912 -176 WIRE 1168 -176 976 -176 WIRE 912 -144 912 -176 WIRE 1168 -144 1168 -176 WIRE 976 -128 976 -176 WIRE 96 -112 96 -128 WIRE -112 -32 -112 -64 WIRE 272 -32 256 -32 WIRE 464 -32 352 -32 WIRE 576 -32 576 -112 WIRE 576 -32 544 -32 WIRE 912 -32 912 -80 WIRE 976 -32 976 -48 WIRE 976 -32 912 -32 WIRE 96 -16 96 -32 WIRE 976 -16 976 -32 WIRE 1008 -16 976 -16 WIRE 640 0 640 -16 WIRE 256 32 256 -32 WIRE 496 32 496 16 WIRE 576 32 576 -32 WIRE 576 32 496 32 WIRE 976 80 976 -16 WIRE -112 112 -112 48 WIRE 640 112 640 80 WIRE 704 112 640 112 WIRE 448 128 416 128 WIRE 832 128 832 64 WIRE 832 128 768 128 WIRE 912 128 832 128 WIRE 576 144 576 32 WIRE 576 144 512 144 WIRE 704 144 576 144 WIRE 112 160 -64 160 WIRE 256 160 256 96 WIRE 256 160 192 160 WIRE 448 160 256 160 WIRE 640 176 640 112 WIRE 976 192 976 176 WIRE 416 224 416 128 WIRE 416 224 304 224 WIRE 304 240 304 224 WIRE -112 256 -112 192 WIRE 416 272 416 224 WIRE 640 272 640 256 WIRE 304 336 304 304 WIRE -112 368 -112 336 WIRE 416 368 416 352 WIRE 416 464 416 448 FLAG -112 368 0 FLAG 96 -16 0 FLAG 416 464 0 FLAG 480 112 vcc FLAG 480 176 0 FLAG 1168 -64 0 FLAG 1008 -16 out FLAG 96 -128 +8V FLAG -112 -64 +8V FLAG 576 -208 +8V FLAG 304 336 0 FLAG 736 96 vcc FLAG 736 160 0 FLAG 640 272 0 FLAG 640 -16 +8V FLAG 976 192 0 FLAG 832 -16 +8V SYMBOL battery 96 -128 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName Vreg SYMATTR Value 8 SYMBOL res -128 240 R0 SYMATTR InstName R1 SYMATTR Value 4.7k SYMBOL res 208 144 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R9 SYMATTR Value 200k SYMBOL Opamps\\opamp2 480 80 R0 SYMATTR InstName U2 SYMATTR Value LM393 SYMBOL res 592 -96 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R4 SYMATTR Value 3.9k SYMBOL battery 1168 -160 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName Vbatt SYMATTR Value 13.2 SYMBOL voltage 416 352 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName Vsensor SYMATTR Value PWL(0 0 5 5 10 0) SYMBOL Misc\\pot -128 96 R0 WINDOW 3 -98 124 Left 0 SYMATTR Value Rtot=1K wiper={w1} SYMATTR InstName U1 SYMBOL res 400 256 R0 SYMATTR InstName R7 SYMATTR Value 150k SYMBOL Misc\\pot 560 -48 R90 WINDOW 3 -19 -64 VRight 0 SYMATTR Value Rtot=500K wiper={w2} SYMATTR InstName U3 SYMBOL res -128 -48 R0 SYMATTR InstName R2 SYMATTR Value 5.6k SYMBOL res 368 -48 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R6 SYMATTR Value 430k SYMBOL diode 240 32 R0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL cap 288 240 R0 SYMATTR InstName C1 SYMATTR Value 330nF SYMBOL ind 960 -144 R0 WINDOW 0 37 17 Left 0 WINDOW 3 39 47 Left 0 SYMATTR InstName L1 SYMATTR Value 100m SYMATTR SpiceLine Rser=400 SYMBOL diode 928 -80 R180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL Opamps\\opamp2 736 64 R0 SYMATTR InstName U4 SYMATTR Value LM393 SYMBOL res 624 -16 R0 SYMATTR InstName R3 SYMATTR Value 100k SYMBOL res 624 160 R0 SYMATTR InstName R5 SYMATTR Value 100k SYMBOL npn 912 80 R0 SYMATTR InstName Q1 SYMATTR Value 2N2222 SYMBOL res 848 80 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R8 SYMATTR Value 3.9k TEXT 648 448 Left 0 !.include pot.sub TEXT 648 416 Left 0 !.lib LM393.sub TEXT 648 384 Left 0 !.tran 10 TEXT 904 384 Left 0 !*.step param w2 0 1 1 TEXT 904 424 Left 0 !.param w1=.4556 TEXT 904 464 Left 0 !.param w2=.5 TEXT 992 -64 Left 0 ;Rrelay=400 TEXT -72 72 Left 0 ;3.65V when Vsensor is high\n(relay coil is deenergized) TEXT 416 48 Left 0 ;Threshold adj LINE Normal -25 115 -16 160 LINE Normal -15 146 -16 160 LINE Normal -22 149 -15 146 LINE Normal -16 160 -22 149