Bipolar Junction Transistors - Common Emitter Amplifier

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  • Опубліковано 5 вер 2024
  • This electronics video tutorial provides a basic introduction into the common emitter amplifier which uses a NPN bipolar junction transistor. This video explains how to calculate the voltage gain, current gain, and power gain of the CE amplifier circuit.
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КОМЕНТАРІ • 228

  • @TheOrganicChemistryTutor
    @TheOrganicChemistryTutor  7 місяців тому +3

    Final Exams and Video Playlists: www.video-tutor.net/

    • @vbacz
      @vbacz 7 місяців тому +2

      Nice ma goat

  • @elaindickson3400
    @elaindickson3400 4 роки тому +61

    You are one of the best teachers that I have come across Sir. Your clarity and delivery is phenomenal on every level. As an Electrician, I have learnt a lot more about electronic components and their calculation. I am not contented being an Electrician but an Instrument Technician as well.
    Many thanks to you Sir. You have helped me alone this journey. Keep up the good work you are doing. May God continue to bless you and keep you safe always.

  • @butchness6980
    @butchness6980 Рік тому +158

    it is actually crazy how well he can explain things compared to my EE professors.

    • @TraaaaaasshBooooaaaatttt
      @TraaaaaasshBooooaaaatttt Рік тому +4

      professors tend to assume your understanding is on par with theirs

    • @gracenownby
      @gracenownby Рік тому +10

      @@TraaaaaasshBooooaaaatttt it's just hard for people to understand what you're struggling with sometimes. Once you understand a subject in EE it's generally not so hard I think.
      But yeah I find that's a common sentiment among people, especially at university, they are trying to explain their understanding of something. Which is often way above my head hahaha

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      @eren_yeager9927 9 місяців тому

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    • @mackb996yt3
      @mackb996yt3 9 місяців тому

      ​​@@tajalemark8256no I am studying eee which includes electrical (80℅) and electronics (20%)
      I still identify as electrical engineering but extra knowledge.

    • @oskarjennische2490
      @oskarjennische2490 8 місяців тому

      @@tajalemark8256obviously much of it is same shit. Even industrial economy does a basics course in EE on my university

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    @deepitpatil 4 роки тому +56

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    @Kent-vq5qb 4 роки тому +48

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      @mattkan3275 3 роки тому +1

      amazing

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +1

      How’d the rest of college go, or are you still studying?

  • @gasperh.9800
    @gasperh.9800 3 роки тому +91

    you taught me as much as my teacher in 4 months of online school

  • @smportis
    @smportis 3 роки тому +26

    Though I was a computer engineer major in college, and am currently studying for a ham radio exam, circuits are still a mystery to me. This has helped get a glimpse into all the very high level ham radio circuit theory where we are just essentially memorizing a little theory and a lot of answers to questions that will be asked verbatim on the exam (50 questions from a pool of 600).
    I still marvel at the fact that people have discovered putting capacitors at C1 and C2 will filter out DC signal, and that Re controls the E voltage... (and all else about circuits). Thanks for this work. Much appreciated

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +1

      I felt the exact same way, and I also took the first two ham radio tests a long time ago. I definitely remember the theory and memorization!

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      @smportis 3 роки тому +3

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    • @PunmasterSTP
      @PunmasterSTP 3 роки тому

      @@smportis That's awesome; congrats!

    • @smportis
      @smportis 3 роки тому +1

      @@PunmasterSTP thanks man.

    • @RexxSchneider
      @RexxSchneider 2 роки тому +1

      Unfortunately, Re doesn't control the emitter voltage. That's simply around 0.65V below the base voltage, which is controlled by the base bias resistors.

  • @lavenderbex
    @lavenderbex 4 роки тому +52

    I’m watching is video not even knowing what any of this stuff is just bc I like the sound of your voice😁

    • @shahadat_955
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  • @chasingfairies67
    @chasingfairies67 4 роки тому +9

    you are a legend!!!! literally saved me from failing😭 your explanations are so clear and easy to understand💛 my professer just does not make sense at all and made everything sounds suPER complicated. THANK YOUUUUUU!!!

    • @marccowan3585
      @marccowan3585 4 роки тому +1

      What are you talking about, this guy doesn't teach you anything, any real exam would expect you to solve for the output voltage and current, not just give it to you

    • @z3nkin
      @z3nkin 3 роки тому +3

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    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +1

      @@marccowan3585 At the end of the day it’s free content. And if someone just watches videos, doesn’t think critically about things, and doesn’t try solving problems or building circuits on their own, then I think it’s more on them. Personally I find his videos very interesting and enlightening.

  • @strotter5795
    @strotter5795 3 місяці тому

    I want to say "thank you" for this video. I've been trying to learn some of this stuff as a hobby, but I've gotten nowhere because most people posting content assume that anyone watching these vids must be in possession of a baseline knowledge of electronics that I don't have. I've found the search for said knowledge is curiously difficult. It's been frustrating. This video was knowledgeable and informative. So many 'aha!' moments.

  • @allinoner
    @allinoner 3 роки тому +5

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    I’ve been looking for someone to explain to me what happens to the electricity exactly from the input to the output. What every component does to it and I finally found you. Thank you sir.

  • @PunmasterSTP
    @PunmasterSTP 3 роки тому +5

    NPN? More like “On you I can depend!”, because these videos are amazing. Thanks so much for making and sharing them!

    • @thething6936
      @thething6936 2 роки тому +6

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      @PunmasterSTP 2 роки тому

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  • @maleenh1738
    @maleenh1738 3 роки тому +8

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    @kanayamaharaj1446 4 роки тому +4

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  • @diagorasofmel0s
    @diagorasofmel0s 3 роки тому +51

    so i took a whole designing course in my 3rd semester and didn't learn this much as i did in these 11 minutes

    • @mrpedrobraga
      @mrpedrobraga 3 роки тому +3

      I'm currently in my class, what i did was join in and mute it to watch this

    • @PunmasterSTP
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      I feel like the educational value of a resource is inversely proportional to its size a lot of times…

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    @sangeetasang9437 2 роки тому

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    @Masterlewger 3 роки тому +3

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  • @melissarainchild
    @melissarainchild 4 роки тому +12

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    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +1

      I feel exactly the same way.

  • @user-ys5qj6xr2j
    @user-ys5qj6xr2j Рік тому +1

    我年輕時可沒有人這樣講解。

    • @yavuz6X
      @yavuz6X 9 місяців тому

      You just watch the whole video for say that ?

  • @markseidel19
    @markseidel19 3 роки тому +1

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    @yourboichlorine 3 роки тому +65

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      @helan311 3 роки тому +3

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    @iwishifiwasaneconomicsnerd9648 4 роки тому +13

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  • @AGUCHIBUEZE-dp3id
    @AGUCHIBUEZE-dp3id 9 місяців тому

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    Thanks to this channel

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    @sexybeastvloger4925 Рік тому

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  • @robertlinder6414
    @robertlinder6414 9 місяців тому +1

    Flashback to High school electronics shop.

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    @videobyandrew Рік тому

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  • @kshitiz41
    @kshitiz41 6 місяців тому

    As I am an electrical student not electronics, so very well explained thank u🤞

  • @mohammadurgur953
    @mohammadurgur953 4 роки тому +3

    I watched MANY tutorials, you are GOOD.

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    @flapajawea Рік тому +2

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    @jaretw4293 4 роки тому +1

    How are you following my electrical engineering courses exactly with these new videos! We just learned CE BJT Amp this week, thank you!!!

    • @jaretw4293
      @jaretw4293 4 роки тому +1

      More of these videos please!

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +1

      @@jaretw4293 AMPsolutely!

  • @helloworld252
    @helloworld252 4 роки тому +3

    Nice sir it is easy to understand

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    @kabandajamir9844 2 роки тому

    The world's best teacher

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    @justinetheewordgiver1197 3 роки тому +1

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    @gemsthkchm5356 4 роки тому +16

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    Thank you so much. May God give you showers of blessing 😊.

    • @aqeelshah5801
      @aqeelshah5801 4 роки тому +2

      Yes you are right bro. I am from Pakistan but I loves indian NEET and JEE. Preparing these competitive tests are really helpful for understanding physics , Mathes and chemistry deeply.

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      @gemsthkchm5356 4 роки тому +5

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      @oc3fathimanuha555 3 роки тому +2

      Gems thkchm did u pass yr neet?

    • @rayanjaved6264
      @rayanjaved6264 9 місяців тому

      did you clear NEET?

  • @steveo44
    @steveo44 4 місяці тому

    Amazing explanation. Your a stellar teacher

  • @alexandrachiritescu5352
    @alexandrachiritescu5352 2 місяці тому

    If only my electronics professor explained everything like this...

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    @taliahpillay6362 3 роки тому +1

    Bro you're a life saver

  • @asteroid626
    @asteroid626 3 роки тому +1

    I have enjoyed the lesson. Thanks very much sir

  • @tefomaleke2879
    @tefomaleke2879 2 роки тому

    Thank you so Much Sir......please never stop making videos. They're beneficial to Many of us

  • @indigenousone8020
    @indigenousone8020 4 роки тому +4

    This is very helpful thank you

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    @trapmusicnation7471 4 роки тому +4

    Thank you so much

  • @josephburton92
    @josephburton92 2 роки тому +1

    Easy way I remember how to decipher them. NPN (Never points N) PNP (Points N Permanently)

  • @mattkan3275
    @mattkan3275 3 роки тому +1

    You teach very well, thank you

  • @cheesepie4ever
    @cheesepie4ever 4 роки тому +1

    Thank you for these videos it is very useful for my Electronic engineering course

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому

      How did the course go?

    • @cheesepie4ever
      @cheesepie4ever 3 роки тому +1

      @@PunmasterSTP I'm just going into my third year now it's going well so far

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому

      @@cheesepie4ever Awesome, I am glad to hear it! I did biomedical engineering, but with a concentration that was basically EE. Have you encountered microcontrollers yet?

    • @cheesepie4ever
      @cheesepie4ever 3 роки тому +1

      @@PunmasterSTP yeahh absolutely, microcontroller stuff is some of my favourite

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому

      @@cheesepie4ever I'm glad to hear it! I can't quite recall if this is the same microcontroller I used in college, but based on my college's site, I think it was the Texas Instruments TM4C123. What do you use?

  • @Ojackbauer0
    @Ojackbauer0 3 роки тому +4

    To represent the 180 degree phase shift of the outputting signal the gain should be negative.

  • @nyakabb2472
    @nyakabb2472 5 місяців тому

    Wish l could have an option of liking this like a hundred times 🎉

  • @youtuuba
    @youtuuba 2 роки тому +1

    Good video as far as it went, but it included nothing about the logical questions a student might well ask, such as 'why is that resistor divider there on the input, and what are the functions of the collector and emitter resistors'? Some mention could have been made about selecting resistors to place the transistor's response in the middle of its most linear gain curve, etc. A bit of dialog about the actual way the transistor in this circuit is modulating the output voltage, since the output signal does not pass through the transistor. Things like that......

    • @AndrewKiethBoggs
      @AndrewKiethBoggs Рік тому

      Hi Youtuuba! Check out his other video on voltage divider biasing. Essentially, there are many ways to bias amplifier circuits and one of them is using a voltage divider. This helps with changes in Beta due to things like temperature effects. He does a great job explaining in that video, it is just for DC analysis and stability.

  • @hamad9218
    @hamad9218 3 роки тому +1

    Thank you very helpful

  • @echimadrian2007
    @echimadrian2007 2 роки тому +3

    Awesome video.
    Thank you!
    How can we calculate resistors, and maybe the caps, based on input and output V / I and transistor specs?
    I am thinking to do one for my headphones, to amplify from phone.

  • @MezGaming-zp5ei
    @MezGaming-zp5ei 6 місяців тому

    I can feel this will come in my exam.....

  • @kjmtanta6769
    @kjmtanta6769 4 роки тому +3

    Appreciate your gift sir, you lecture well.
    However, I have a question. If the circuit is designed in such a way that DC is blocked from both the input and the output, then why include it in the first place? In other words, why is the transistor circuit subjected to both AC and DC?

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +2

      I think part of the reason is that the transistor has to be biased (with DC) appropriately.

    • @GogiRegion
      @GogiRegion 2 роки тому +4

      @@PunmasterSTP Correct. You use the DC in order to compensate for the bias so that small AC signals are able to get past the bias. If output is “O = beta * AC - B” you add a DC voltage to compensate for B so that the output is “O = beta * AC” and the output will be more accurate to a perfectly amplified AC signal.

    • @PunmasterSTP
      @PunmasterSTP 2 роки тому +1

      @@GogiRegion Thank you for providing that insight!

  • @chibuikeokwuosa2955
    @chibuikeokwuosa2955 3 роки тому +1

    Can we get a video on FET please

  • @TheEtbetween
    @TheEtbetween 10 місяців тому

    Wow!! You Explain that Really Good! Excellent Job!

  • @filipsevcik1102
    @filipsevcik1102 3 місяці тому +1

    Like when watching in 2024

  • @Muthu__Kumar
    @Muthu__Kumar Рік тому +1

    How to calculate R1,R2,RC,Re,cc,ce to design an audio amplifier

  • @doyoarero5599
    @doyoarero5599 4 роки тому +6

    God save you! Sir

  • @abinashpal1151
    @abinashpal1151 3 роки тому +1

    How find the value of r1 r2 re and cc ce for a given gain and beta value

  • @tamarabarnett9869
    @tamarabarnett9869 Рік тому

    Great tutorial .Thanks.

  • @prabodhagamage6787
    @prabodhagamage6787 3 роки тому +1

    Thank you so much sir ✨🥺❤️

  • @kelvinbyabato
    @kelvinbyabato 6 місяців тому

    easy to swallow! good work!

  • @aqeelshah5801
    @aqeelshah5801 4 роки тому

    Hi man Love You 💕 From Pakistan 🇵🇰🇵🇰

  • @eggxecution
    @eggxecution Рік тому

    Note: if common emitter amplifier doesn't have bypass capacitor: Av = vout/vin whereas if it has a bypass capacitor its formula is Av = Rc / re where re = Vt/Ie . The common constant threshold voltage value used for Vt = 25mV at 300kelvin

    • @nutskok5394
      @nutskok5394 9 місяців тому

      This is very important I don’t know why he didn’t mention it

  • @adreq3.05
    @adreq3.05 Рік тому

    All depends to individual parametres of transistors types. But how to solve the value resistance of dimmers? It should to add that collector voltage is equall to supply voltage, circa about the half Vcc

  • @kelvinmogaka5978
    @kelvinmogaka5978 2 роки тому

    Representing EGERTON UNIVERSITY 🇰🇪

  • @gdogg4002
    @gdogg4002 4 роки тому +1

    Where were you when I needed you!?

  • @imSurajsingh24
    @imSurajsingh24 2 роки тому

    Good explanation 👍

  • @gusel9
    @gusel9 Місяць тому

    hello,
    very nice video, however, why is the emitter capacitor called CB?
    I thought it will be called CE.
    thanks for your videos

  • @akhilarya7517
    @akhilarya7517 3 роки тому +1

    Good Video Mr Tutor :)

  • @aswathik4709
    @aswathik4709 2 роки тому +1

    when you draw the symbol of transistors, the two terminals of collector and emitter shouldn't intersect at the base terminal. There should be some space in between them. Otherwise it would mean there are only 2 regions.

    • @Yusukess
      @Yusukess 2 роки тому

      that is only for MOSFET's the little gap is in between the gate and the drain/source

    • @georgezayer2934
      @georgezayer2934 Рік тому

      Definitely there is a small gap but unfortunately he could have increased the gap...It is just draft and it is a good draft ...love it ...The fact it is not connected..
      Well done..

  • @donakilasadhanjana8885
    @donakilasadhanjana8885 3 роки тому +1

    is Beta is a constant or it can be vairy?

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +1

      I think it’s mostly constant for any given type of transistor, however it can change with temperature and perhaps other things.

    • @RexxSchneider
      @RexxSchneider 2 роки тому

      It does change somewhat with temperature, but changes most with collector current. For any given transistor type, there will be a collector current where it is a maximum. Below and above that current, it can drop, sometimes by a factor of as much as 3. The best way to get familiar with this is to search for transistor datasheets for different transistor types and look at the figures provided for current gain. Perhaps look at 2N2222, 2N3904, BC547C and 2N3055 to get an idea of the range of beta you may encounter.

  • @avrillindo5830
    @avrillindo5830 4 роки тому +2

    Sir how to bias class ab transistor amplifier?and the loadline of it

  • @zhylerliebesleid9771
    @zhylerliebesleid9771 3 роки тому +1

    In voltage divider bias. with npn transistor. what will happen to the value of voltage gain when there is collector resistor? Can anyone care to teach me?

  • @ainmiky4620
    @ainmiky4620 3 роки тому +1

    I'm confused why there are capacitors and AC input in this circuit. Do we have to have them for us to make a Common Emitter Amplifier?? I learned about Capacitors and AC inputs but I want to dive a little bit deeper as to why they are used here because I don't understand it.

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +1

      I think the capacitors are there because we want to block out DC signals and just amplify AC (or changing) signals. Also, the transistor still needs to be (DC) biased appropriately, which also requires the use of the capacitors.

  • @neerajpatil3736
    @neerajpatil3736 7 днів тому

    thank you

  • @matthiaslivai606
    @matthiaslivai606 Рік тому

    im an mechanical engineering student but need to learn about this as well smh

  • @Combat4Life
    @Combat4Life 4 роки тому +1

    Do a relative displacement video (math)!!!!!

  • @Kevin_F92
    @Kevin_F92 4 місяці тому

    Can anyone explain how the capacitors allow the a.c input signal while blocking the d.c power supply at the same time? I dont understand that

  • @anjelyjoseph3865
    @anjelyjoseph3865 4 роки тому

    You are awesome man!greatest teacher of all times I give ya that.you have all my respect

  • @DeadlockNeo
    @DeadlockNeo 2 роки тому

    Is it possible to make a bandpass filter using this circuit?

  • @RixtronixLAB
    @RixtronixLAB Рік тому

    Nice video, thank you for sharing :)

  • @Acesushii
    @Acesushii 3 роки тому +2

    I am hearing abacus O.o You're using abacus as calcu ???

  • @facundonieto1598
    @facundonieto1598 3 дні тому

    10:40 why is the output signal inverted?

  • @modex20
    @modex20 Рік тому

    The assignment of V input as 10 mV is fine. But the arbitrary assignment of one milliamp input is confusing. How does one determine the value in a real world application?

  • @gsk__18
    @gsk__18 Місяць тому +1

    Watching it in 2024💀

  • @successthruknowledge
    @successthruknowledge Місяць тому

    For an PNP transitor why are the wires and currents named the way? It seems counterintuitive. Ah I did not know that Gain could be in terms of Current or Power.

  • @demetriusdemarcusbartholom8063
    @demetriusdemarcusbartholom8063 2 роки тому

    Thanks

  • @user-wq8ke7rv5d
    @user-wq8ke7rv5d 4 роки тому

    :
    Function
    F=(10/(sinx.cosx+z²))¼
    Point
    P=(1,2,3)
    direction
    a=i+3j+2k

  • @SheikhN-bible-syndrome
    @SheikhN-bible-syndrome Рік тому

    What I don't understand is how can a transistor pull 5 or more amps of power with a resister on every leg and I know these resisters can't handle 5a of power

  • @lagunacorona
    @lagunacorona Рік тому

    How can I find a vcc from rc and re?

  • @Bethsy644
    @Bethsy644 2 роки тому

    What would happen if Cb were shorted?

  • @rahimullah9618
    @rahimullah9618 11 місяців тому

    its too easy , the professors just make it difficult for us

  • @videosofeverything3876
    @videosofeverything3876 2 роки тому

    You are great

  • @ShennyChosenOne
    @ShennyChosenOne 3 місяці тому

    Isn’t P equal to U times I^2?

  • @ma5tv393
    @ma5tv393 2 роки тому

    How to calculate resister and capacitor value

  • @Recylops
    @Recylops 3 роки тому +1

    what actually determines beta? is it something external to the transistor or is it some inherent quality of the transistor itself?

    • @PunmasterSTP
      @PunmasterSTP 3 роки тому +1

      I thought it was inherent. I think he has mentioned several times that beta values range from around 100 to 200 (IIRC) for a bipolar junction transistor (BJT).

    • @RexxSchneider
      @RexxSchneider 2 роки тому +1

      The beta of a transistor is determined by the way the transistor is manufactured and is completely inherent in the transistor type. A modern small-signal transistor might have a beta as high as 800, while an older transistor. or a power transistor might have a beta as low as 20. It also will vary somewhat with the collector current that is being used, so you should check on the datasheet for the transistor you are using for its possible range.
      For example, if you search for "2N2222 datasheet", you'll find a section labelled "DC Current Gain", you'll see that its minimum guaranteed beta is 35 at Ic=0.1mA; 100 at Ic=150mA; and 40 at Ic=500mA. You'd normally be using it as an amplifier with a collector current of a few mA and would probably design for a worst-case beta of 50.

  • @markmusicman
    @markmusicman Рік тому

    Wouldn't the input power by 10uW , I got confused at this point. 10mV x 1mA = 10uW Am I missing something?

  • @MuhdAkmalBSanid
    @MuhdAkmalBSanid 2 роки тому

    if Vin=0 what is the value of Vce

  • @alihasafdar8256
    @alihasafdar8256 2 роки тому

    Is Vce=vbe ???

  • @hashanmadusanka6128
    @hashanmadusanka6128 2 роки тому

    how to find resistor values

  • @fatimaalbaghdadi9225
    @fatimaalbaghdadi9225 3 роки тому

    كفوووووو منكككككككككك 🤚🏿😭😂♥️♥️♥️