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Author Topic: Phototransistors and Photoresistor  (Read 2041 times)

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Offline airman00Topic starter

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Phototransistors and Photoresistor
« on: March 02, 2008, 12:34:35 PM »
Phototransistors and photoresistors can both detect light , correct? Meaning can I substitute a phototransistor for a photoresistor to detect the light from a flashlight?
Thanks,
Eric
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Offline ed1380

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Re: Phototransistors and Photoresistor
« Reply #1 on: March 02, 2008, 02:20:08 PM »
http://www.techimo.com/forum/showthread.php?t=32866

first link in google. you can make a phototransistor from a photoresistor and a regular transistor. both very close to being the same.

a photoresistor changes resistance so you'd need to compare it with something to see if it senses light. a phototransistors output is based on the light. also need a compare. just use what you have laying around or what cheaper  ;D
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Offline airman00Topic starter

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Re: Phototransistors and Photoresistor
« Reply #2 on: March 02, 2008, 02:24:43 PM »
thanks ed

i'll play around with them now
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