Phototransistor circuit
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Phototransistor circuit

 
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jumbo1



Joined: 06 Mar 2006
Posts: 2
Posted: Mon Mar 06, 2006 8:03 pm    Post subject: Phototransistor circuit Reply with quote
Hi all

I am trying to build a basic phototransistor circuit.

Objective: to sense small variations of light and translate them to a voltage variation.

I have seen many circuits on the internet, and none shows where the base is connected to?? already got a phototransistor, and it got 3 pins (B-C-E), so where should i connect the base to??

Plus, does any of you have a nice circuit that can be useful to me? Because it is the first time i deal with phototransistors...

Any help would be apreciated...

NB: please keep in mind that im trying to build a sensor that can detect SMALL variations of light...

Thank you.

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neon



Joined: 25 Feb 2006
Posts: 594
Posted: Thu Mar 16, 2006 3:57 pm    Post subject: Reply with quote
nobody answer you so i will try to help you if i can you must bias the base to somewhere between vcc and ground. i have no idea of what you have but usualy it requires bias for photocell like a resistor devider where the photocell is a variable R.
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jumbo1



Joined: 06 Mar 2006
Posts: 2
Posted: Thu Mar 16, 2006 4:01 pm    Post subject: Reply with quote
thanx man, i already did it

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