There are two amplifier circuits in my electronics lab. I know one is inverting and one is not but I can’t put my finger on why.
(A) I have to explain why R1 and R2 are about the same for the emitter follower (non-inverting / ‘common collector’).
I also need to (B) explain why the inverting is an inverting amplifier and (C) why the non-inverting is a non-inverting amplifier.
2. Relevant equations
3. The attempt at a solution
In my notes I have that usually R1≈R2 but my prof. didn’t say why. My understanding is that for this type of amplifier you actually don’t want a voltage amplification. The use of the amplifier is to go from a weak signal to a strong signal. I would imagine the ratio of these resistors has something to do with that but I can’t put my finger on why that is the case. Is it because:
To make sure that VE and VB are the same we removed the RC resistor and made the other two the same?
I read that inverting amplifiers ground their non-inverting source and don’t ground their inverting source. The alternative seems to be true for non-inverting amplifiers. This doesn’t seem to be clear in the schematic though. Is there some other reason? If not, any suggestions as to how I can view this schematic in that sense?