NPN Infrared Phototransistor as Light Sensor

Thread Starter

truwebs

Joined Apr 2, 2016
76
Hey All,

Was wondering if an Infrared Phototansistor can be used as a light sensor in place of an LDR? If so, can you direct me to a circuit diagram to follow?

Thanks
TRU
 
Last edited:

DickCappels

Joined Aug 21, 2008
5,943
Your andwer is in the link that Raymond Genovese provided in post #2.

On that page scroll down to the diagram showing a photo transistor connected to a resistor. When light falls on the transistor, the voltage on the emitter increases. No other parts are needed -the operation is very similar to that of an LDR.
 
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