Version 4 SHEET 1 880 680 WIRE 464 -16 -80 -16 WIRE -80 32 -80 -16 WIRE 352 32 272 32 WIRE 32 64 16 64 WIRE 144 64 112 64 WIRE 160 64 144 64 WIRE 464 80 464 -16 WIRE 16 112 16 64 WIRE 432 112 352 112 WIRE 272 128 272 32 WIRE 272 128 208 128 WIRE 144 144 144 64 WIRE 176 144 144 144 WIRE -80 160 -80 112 WIRE 0 160 -80 160 WIRE 96 160 80 160 WIRE 144 160 96 160 WIRE 240 160 240 64 WIRE 272 160 240 160 WIRE -80 176 -80 160 WIRE 144 176 144 160 WIRE 176 176 144 176 WIRE 272 176 272 160 WIRE 96 192 96 160 WIRE 352 208 352 176 WIRE -80 288 -80 256 WIRE 96 288 96 272 WIRE 96 288 -80 288 WIRE 208 288 208 192 WIRE 208 288 96 288 WIRE 224 288 208 288 WIRE 352 288 352 272 WIRE 352 288 224 288 WIRE 432 288 432 112 WIRE 432 288 352 288 WIRE 464 288 464 160 WIRE 464 288 432 288 WIRE 224 304 224 288 FLAG 224 304 0 FLAG 16 112 0 SYMBOL res 80 176 R0 SYMATTR InstName R4 SYMATTR Value 39k SYMBOL res 128 48 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 50k SYMBOL res 256 48 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R2 SYMATTR Value 39k SYMBOL res 368 160 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R5 SYMATTR Value 2.5k SYMBOL cap 336 208 R0 SYMATTR InstName C1 SYMATTR Value 0.1µ SYMBOL Misc\\battery 352 16 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL Opamps\\UniversalOpamp2 208 160 R0 SYMATTR InstName U1 SYMATTR SpiceLine ilimit=25m rail=1.5 Vos=0 phimargin=45 SYMATTR SpiceLine2 en=0 enk=0 in=0 ink=0 Rin=1000000Meg SYMBOL res 96 144 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R3 SYMATTR Value 50k SYMBOL Misc\\battery 464 64 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL res -96 16 R0 SYMATTR InstName Rm SYMATTR Value 10k SYMBOL res -96 160 R0 SYMATTR InstName Rs SYMATTR Value {Rs} TEXT -80 328 Left 0 !.tran 0 10 0 1 TEXT -56 296 Left 0 !{Rs}=12k TEXT 104 360 Left 0 !.step param Rs=12000 130000 10000