If you were unable to order OPT101 from Texas Instruments sampling program
,you will have no choice but to build your own photo-ic. It is basically a photodiode which operates in photovoltaic mode or zero-bias condition. In this mode, the photodiode generates a small voltage
just like a solar cell. Current then flows from the photodiode to the
feedback resistor producing a voltage drop. This voltage drop is then amplified by
the operational amplifier. The best locally available photodiode for the job is BPW34 (Visible light) or BPW34F (Infrared). You can also use ordinary LEDs as photodiodes but expect lower sensitivity figures.






















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