Version 4 SHEET 1 880 680 WIRE 32 16 -64 16 WIRE 176 16 32 16 WIRE 320 16 176 16 WIRE 32 48 32 16 WIRE 176 48 176 16 WIRE -64 64 -64 16 WIRE 320 144 320 16 WIRE 176 160 176 128 WIRE 240 160 176 160 WIRE 288 160 240 160 WIRE 368 176 352 176 WIRE 32 192 32 128 WIRE 240 192 32 192 WIRE 288 192 240 192 WIRE 32 224 32 192 WIRE 176 224 176 160 WIRE 32 320 32 288 WIRE 176 320 176 304 FLAG 320 208 0 FLAG 32 320 0 FLAG 176 320 0 FLAG -64 144 0 FLAG 368 176 out IOPIN 368 176 Out FLAG 240 192 VF FLAG 240 160 meas SYMBOL Opamps\\UniversalOpamp2 320 176 R0 SYMATTR InstName U1 SYMBOL res 16 32 R0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL LED 16 224 R0 SYMATTR InstName D1 SYMATTR Value QTLP690C SYMATTR Description Diode SYMATTR Type diode SYMBOL res 160 32 R0 SYMATTR InstName R2 SYMATTR Value 3.3k SYMBOL res 160 208 R0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL voltage -64 48 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 3V TEXT 232 320 Left 0 !.dc V1 3V 2V 1mV