When to use a common collector amplifier (3-Transistors)

A common collector amplifier has a gain of only 1. So what's the purpose of it? Let's show how it serves nicely as a buffer! Let's start to find its input and output impedance too.
Aaron Danner is a professor in the Department of Electrical and Computer Engineering at the National University of Singapore.
danner.group
Video filmed and edited by Cheryl Lim.
@randomcheryl

[@tomaszgasecki]

This chanel is underrated. Pure gold of knowledge. Thank you for sharing and clear explanations.

[@kunalblack]

Thank You Professor ❤

[@bob_mosavo]

Thanks, Prof. Aaron 👍

[@Enigma758]

I really like your method of determining common collector as "transistor lead not in the signal path" because it is so straight forward. However, I have always understood it to be the lead which is common to both input and output sides of the transistor circuit. For a common collector amplifier, this would be the collector since it's connected to V+ (power) which is common to both input and output of the circuit. Both methods lead to the same result and I suspect the mapping between the two methods is that if a lead is common, it can't be in the signal path since it is providing power or ground to both the input and output sides.

[@eranhaicohen4932]

hey Aaron', thank you' you have the best channel hope you will continue to upload videos

[@andrejtih7373]

спасибо!!!

[@stefano.a]

Please insert dots in the schematic where there are junctions. Thank you.

[@user-jp4lr6lv1l]

Hi and thanks a lot.which class amplifier used as simple video amplifier

[@scottfager2292]

Why are the two fractions multiplied together at the end of the video ?

[@Tezza120]

I always heard transistors configured like this called an Emitter Follower. It makes sense because the emitter voltage follows the base voltage via the base-emitter diode in the transistor but with the current gain of the transitor giving smaller output impedance.