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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professors tend to assume your understanding is on par with theirs
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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
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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.
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Lol i like the sound of his voice too
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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
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Easy way I remember how to decipher them. NPN (Never points N) PNP (Points N Permanently)
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To represent the 180 degree phase shift of the outputting signal the gain should be negative.
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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......
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.
Thank you very helpful
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.
I can feel this will come in my exam.....
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?
I think part of the reason is that the transistor has to be biased (with DC) appropriately.
@@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.
@@GogiRegion Thank you for providing that insight!
Can we get a video on FET please
Wow!! You Explain that Really Good! Excellent Job!
Like when watching in 2024
How to calculate R1,R2,RC,Re,cc,ce to design an audio amplifier
God save you! Sir
How find the value of r1 r2 re and cc ce for a given gain and beta value
Great tutorial .Thanks.
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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
This is very important I don’t know why he didn’t mention it
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
Representing EGERTON UNIVERSITY 🇰🇪
Where were you when I needed you!?
Good explanation 👍
hello,
very nice video, however, why is the emitter capacitor called CB?
I thought it will be called CE.
thanks for your videos
Good Video Mr Tutor :)
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.
that is only for MOSFET's the little gap is in between the gate and the drain/source
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..
is Beta is a constant or it can be vairy?
I think it’s mostly constant for any given type of transistor, however it can change with temperature and perhaps other things.
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.
Sir how to bias class ab transistor amplifier?and the loadline of it
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?
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.
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.
thank you
im an mechanical engineering student but need to learn about this as well smh
Do a relative displacement video (math)!!!!!
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
You are awesome man!greatest teacher of all times I give ya that.you have all my respect
Is it possible to make a bandpass filter using this circuit?
Nice video, thank you for sharing :)
I am hearing abacus O.o You're using abacus as calcu ???
yeah
10:40 why is the output signal inverted?
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?
Watching it in 2024💀
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.
Thanks
:
Function
F=(10/(sinx.cosx+z²))¼
Point
P=(1,2,3)
direction
a=i+3j+2k
Where did that come from?
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
How can I find a vcc from rc and re?
What would happen if Cb were shorted?
its too easy , the professors just make it difficult for us
You are great
Isn’t P equal to U times I^2?
How to calculate resister and capacitor value
what actually determines beta? is it something external to the transistor or is it some inherent quality of the transistor itself?
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).
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.
Wouldn't the input power by 10uW , I got confused at this point. 10mV x 1mA = 10uW Am I missing something?
10uW = 0.01mW
if Vin=0 what is the value of Vce
Is Vce=vbe ???
how to find resistor values
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