Version 4 SHEET 1 880 680 WIRE 16 32 0 32 WIRE 0 48 0 32 WIRE 0 160 0 128 WIRE 160 160 0 160 WIRE 224 160 160 160 WIRE 0 192 0 160 WIRE 160 192 160 160 WIRE 384 224 368 224 WIRE 368 240 368 224 WIRE 0 304 0 272 WIRE 160 304 160 272 WIRE 160 304 0 304 WIRE 0 320 0 304 FLAG 0 320 0 FLAG 0 32 VCC FLAG 224 160 out IOPIN 224 160 Out FLAG 368 320 0 FLAG 368 224 VCC SYMBOL res -16 32 R0 SYMATTR InstName R1 SYMATTR Value {10k-R} SYMBOL res -16 176 R0 SYMATTR InstName R2 SYMATTR Value {R} SYMBOL res 144 176 R0 SYMATTR InstName R3 SYMATTR Value {Rp} SYMBOL voltage 368 224 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5V TEXT 160 40 Left 0 !.op TEXT 160 72 Left 0 !.step param R 100 9.9k 100 TEXT 160 104 Left 0 !.step param Rp list 1k 10k 100k