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How to use a photo transistor as voltage source

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MobiNaz

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Hi all,

I want to use photo transistor as a voltage source with minimum components and no biasing, could anybody please guide.

I know if I attach a resistor parallel to a photodiode, I can make it work as a voltage source.

Thanks in Advance.
 

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  • FairchildPD-AN-3005.pdf
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  • SharpPhotoDevices.pdf
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  • phototransistors.pdf
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Thank you so much for your help.
Just a quick question, if a photodiode sensitive to 900nm wavelength is illuminated by sun instead of 900nm source. How will its performance be affected? Will it work similarly when illuminated by both sources?
 

There are a lot of variables in your question.

....if a photodiode sensitive to 900nm wavelength is illuminated by sun instead of 900nm source.
Click to expand...


Depends on the time of day, weather conditions, etc. I found some discussion concern near infrared spectrums of the sun:

Companies may claim lasers and pulse rates are important, but the only things are the wavelength and total amount of light energy applied. For example, 880 nm is a bad choice. Bright noon-time summer Sun only has half as much light energy as LED devices in the optimum wavelengths.
Click to expand...

figure1.gif


Notice the deep dip close to the 900nm wavelength for the terrestrial spectrum.

Depending on the postion of the phototransister in relation to the sun, interference may or may not occur, again it depends on many factors. If your worried about interference from the sun, use a shield of some sort.

Hope this helps in your decisions.
 
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