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Electronics => Electronics => Topic started by: dsesmg on August 23, 2009, 06:18:03 AM

Title: Photo detector
Post by: dsesmg on August 23, 2009, 06:18:03 AM

Hi,  I am also going to order some of this detector.
http://www.flickr.com/photos/34955071@N02/3847661073/sizes/o/
http://www.flickr.com/photos/34955071@N02/3847661077/sizes/o/
But, I am wondering what is the operating voltage of this detector.
Could you tell me which specification do I have to see to check out the operating voltage?
I am also looking at the spectral sensitivity of this detector.
I am wondering whether the spectral sensitivity is higher, it means it is more sensitive to visible lights.

Title: Re: Photo detector
Post by: SmAsH on August 23, 2009, 06:24:01 AM

is this in relation to the other topics?
is there any reason why you are using a photodiode and not a photo transistor?

Title: Re: Photo detector
Post by: dsesmg on August 23, 2009, 05:35:34 PM

Hi, James.
Yes, this topic is related with the motor control topic I posted earlier.
Actually, I never used any ir sensors or photo dectors before.
This is the first time, so I am trying to use both diodes and transistors for my learning experience.
There is no special reason for me to use both of them.
I just hope that I could use them as a switch. Detector as a switch and emitter as a trigger element. :)

Title: Re: Photo detector
Post by: dsesmg on August 23, 2009, 09:32:33 PM

I just contacted the supplier of the detectors.
He said the operating voltage is 0.4VDC and operating current is 8~15uA.

Title: Re: Photo detector
Post by: SmAsH on August 24, 2009, 12:53:44 AM

yes, there is a .4v drop across the diode.
i am not sure whether it can be used as a switch as i have never used photo diodes before but im
sure google will be able to turn up some results ;)