Common emitter amplifier question

Audioguru

Joined Dec 20, 2007
11,248
The base-emitter of a transistor is a silicon diode. For the NPN transistor you have its anode is the base and the cathode is the emitter as you showed in img1. It needs about 0.6V to conduct.
The positive voltage from the solar panel (more than one 0.5V solar cell) connected to the base as you show will cause base current to flow and cause the transistor to turn on.
 

Audioguru

Joined Dec 20, 2007
11,248
.6v causes the current to flow which way?
Instead of worrying about "conventional current flow" or the reverse which is "electron current flow", simply learn that when a diode is forward biased then it conducts current. When a diode is reverse biased then it blocks current flow.
A diode is forward biased when its anode is positive and/or its cathode is negative.
 
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