Version 4
SHEET 1 880 680
WIRE 176 112 -16 112
WIRE 288 112 256 112
WIRE 368 112 288 112
WIRE 512 128 432 128
WIRE 368 144 336 144
WIRE -16 160 -16 112
WIRE 288 160 288 112
WIRE 512 160 512 128
WIRE 400 176 400 160
WIRE 416 176 400 176
WIRE 288 256 288 240
WIRE 336 256 336 144
WIRE 512 256 512 224
WIRE 512 256 336 256
WIRE 512 288 512 256
WIRE 0 304 -16 304
WIRE -16 320 -16 304
WIRE 512 384 512 368
FLAG -16 400 0
FLAG -16 240 0
FLAG -16 304 VCC
FLAG 400 96 0
FLAG 400 176 VCC
FLAG 288 256 0
FLAG 512 384 0
SYMBOL voltage -16 304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 5V
SYMBOL voltage -16 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(2.5V 2.5V 1Hz)
SYMBOL Opamps\\UniversalOpamp2 400 128 M180
SYMATTR InstName U1
SYMBOL res 272 96 R90
WINDOW 0 5 56 VBottom 0
WINDOW 3 27 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 47k
SYMBOL res 304 256 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL LED 496 160 R0
SYMATTR InstName D1
SYMATTR Value QTLP690C
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 496 272 R0
SYMATTR InstName R3
SYMATTR Value 100