Transistors 101 ep5: Introducing Beta

We learn how a transistor in the active region has collector current
proportional to base current. We use that to learn the input and
output impedance of some transistor circuits.


Nothing on the project GitHub this time - the circuits that I
breadboarded were really too trivial to bother with.


TIMELINE

00:00 Intro
00:40 Introducing beta
01:39 The saturated switch
03:20 We don't know beta!
04:37 The emitter follower
07:26 Beta and input impedance
09:28 Beta and output impedance
11:53 What have we learnt?
12:56 Outro

CREDITS

Music:

“Light Sting” Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
http://creativecommons.org/licenses/b...

Images:

"Analog Gauge". OpenClipArt user 'algotruneman'
https://openclipart.org/detail/275140...
Creative Commons Zero

"Smiling Crescent Moon". OpenClipArt user 'snifty'
https://openclipart.org/detail/181947...
Creative Commons Zero

"Spyglass1" OpenClipArt user 'crimperman'
https://openclipart.org/detail/28059/...
Creative Commons Zero

"Thermometer". OpenClipArt user 'bartovan'
https://openclipart.org/detail/218124...
Creative Commons Zero

"Transistor". PixaBay user 'zFunx' via OpenClipArt user 'oksmith'
https://openclipart.org/detail/308904...
Creative Commons Zero

"2N3904", Windell Oskay.
https://www.flickr.com/photos/1742584...
Creative Commons 2.0 Attribution

"2N3055", Mister rf - Own work, CC BY-SA 4.0,
https://commons.wikimedia.org/w/index...
(Cropped for use in this video)


Thanks for watching!