piclist 2000\06\04\233729a >
Thread: Noise in phototransistors/photodiodes/light
www.piclist.com/techref/index.htm?key=noise+phototransistorsphotodiodeslight
face picon face BY : Sean Breheny email (remove spam text)



Hi Jamie,

Thanks for the reply. Well, both have significant IR content, but you may
be correct that the sun would have more. I was simply trying to explain why
I get so much noise when I shine a flashlight into it.

The phototransistor I am currently using has a built-in IR filter.

Sean

At 11:03 PM 6/4/00 -0400, you wrote:
>I think that sunlight will have a much larger IR content then a flash light
>would, so using a flash light bulb will likely not simulate intense
background
>light.
>You could also try using optical filters to filter out light from your
receiver
>that is outside of the IR diode spectrum.
>

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| Sean Breheny
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| Electrical Engineering Student
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In reply to: <393B1865.FDCE2137@sympatico.ca>
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