about common emitter amplifier
Get a dictionary, and look up the word "common". Then look up the word
"emitter" (hopefully it's a recent enough dictionary that it will give
mention to bipolar transistors) and then look up the word "amplifier"
Maybe look up "transistor" for any insight that definition might give.
Then perhaps the term will mean a bit more. Likely a dictionary specific
to electronics (do they still publish those?) would provide a definition
of what it is.
If not, then figure out what it might mean. Keep in mind the various
elements of a bipolar transistor (we know it's a bipolar since only
those have emitters), and what might happen if one of the other elements
were common.
ANd then once you've figure out what it is you want to ask, and can
phrase it properly, then maybe whatever it is you want to ask (we are not
mindreaders) would be worthy of a real answer. Maybe not, depending on
whether you can show you've made a stab at understanding and trip over
some bit, or if you don't want to do any work yourself and expect us
to not only guess what it is you are asking, but provide the answer.
If we can look it up in books, so can you.
Michael
