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== Photo Diode ==
 
== Photo Diode ==
A diode with its junction exposed to light will generate a little bit of voltage and current ( if the circuit resistance is not infinite ).  Diodes that are meant to exploit this are photo diodes, regular diodes often, but not always, are enclosed to keep out the light.  The signal is not strong and lots of amplification can be useful.
 
 
 
== Photo Transistor ==
 
== Photo Transistor ==
 
If a photo diode makes up one junction of a transistor the photo diode has a built in amplifier.  This is the photo transistor.  An advantage is that the signal is larger.
 
If a photo diode makes up one junction of a transistor the photo diode has a built in amplifier.  This is the photo transistor.  An advantage is that the signal is larger.

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