LED and Photodiode - Luke Wyatt LED And Photodiode LED and...

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Luke Wyatt LED And Photodiode 23/11/07 LED and Photodiode Risk Assessment 1. Electrical Investigate the intensity of the LED as a function of distance The value of each of the two resistors is 1000Ω but as they are in parallel = = + = + = 500 500 1 1000 1 1000 1 1 1 1 2 1 T T R R R R Below is the circuit diagram for the detection of light output from an LED The Frequency of the signal generator was set at 3kHz and the peak to peak voltage 20V. Below shows the waveform at point B (voltage across 1 R ), of the red LED. 1 of 5
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Luke Wyatt LED And Photodiode 23/11/07 Below is the values of the current for each of the LED’s Current through red LED = 8mA Current through infra-red LED = -8.25mA Current through yellow LED = 7.75mA Using Ohms law on this diode gives the current through the LED because the LED and resistor are connected in series. Below are the estimated distances between each LED and the photodiode cap end Distance= Red =25mm Yellow =25mm Infra-red =35mm
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