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DPRG: biasing & reading a phototransistor

Subject: DPRG: biasing & reading a phototransistor
From: Justin Kao jkao at bigfoot.com
Date: Tue Aug 17 04:36:24 CDT 1999

>Here's what I recommend:
> 
>Put in a 10K load resistor on the collector, and remove the emitter
>resistor.
> 
>Put a 91 ohm resistor on the diode.
> 
>Stop all current to the diode. See what your leakage current is.
> 
>Then turn off all lights in the room and see what it is.


Is it a diode or a phototransistor??

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