EECE 251 - BJT Design of the Bias Circuit

Of course, once commercial values for Rc and Re are chosen, Vce is not 7.5V anymore. But it will be close enough ... how close? After finishing the design stage, analyse the resulting circuit, or run a simulation on CircuitMaker or ...

[@rolinychupetin]

So many thanks for your extremely kind words, Mr.Lubbock. With your permission, I may put it in my teaching dossier, for next year "quality assurance of teaching" review. Sincerely.

[@Raxarax]

I hope you realize the impact you're having. I hope you realize you're teaching many more students than the ones you see. I hope you realize that some of us don't have good teachers or we just didn't understand the material when it was presented in class or our books are poor but we can come on here and watch your videos two, three or ten times until we understand. I hope you realize that what you are doing is greatly appreciated and is having an impact beyond your institution. Lubbock, TX

[@bryan.conrad]

by far the best explanation of bjt amp design I've found over the last two weeks of studying them. thank you so much for your great work!

[@RedRaven326]

The best teacher on KZbin, on any subject; period.

[@rolinychupetin]

I love your enthusiasm and support.

[@stevesteiner9472]

First time I've ever heard anyone work out the design from the beginning, thank you!

[@castimann]

The only video I have seen that not only explain the bjt biasing theory, but also (and more important), how to set resistor values to a proper biasing given a specific Q-point.

[@atsul.7943]

Mr Rolinychupetin. Your explanation of this tutorial was wonderful especially the voltage divider section. Keep up the good work. I am having an exam next week Tuesday and I believe this tutorial will do me a lot of good. GOD Bless you.

[@TheGeorge1952]

The best explanation I have ever seen by far of the design of a simple common emitter circuit.

[@iamthesrm2]

KZbin algorithm, I love you!

[@fabiovsroque]

Thank you Mr. Roliny Chupetin for all these alsome videos, saving lives here! For me the nicest thing about them is that I can have an overall understanding about one matter, with all the concepts together. IMO usually teatchers want the students to repeat an reapeat each step, what makes the students loose the overall concept. Best regards.

[@viniciusrosacota]

Excellent class sir. BTW, you have a voice of a gentleman. Thank you!

[@learnnow9598]

Finally someone♥️

[@popovlist]

very very nice and neat explanation. Better than a book description. It is not a struggle anymore, its fun !

[@arda9393]

Your tutorial helped a ton in my introduction to electronics final. I can't thank you enough. Regards from Turkey

[@rolinychupetin]

Thank you M. Arda y, and thank you for including what country you are writing from. Turkey, no less. One of the cradles of the western civilization, and of the beginning of humankind perception of the electrical phenomena: Thales of Mileto.

[@ricorico33]

Man GOD bless you, you just teach me what my teacher couldn't.

[@metiseh]

I appreciate you making these videos... I am just sitting and watching the videos :) great they are...

[@PelDaddy]

Best explanation I have seen yet. Thanks.

[@katrax7372]

clear explanation..perfect voice..happy learning from an automation engineer college student in Greece..thank u sir!

[@JurekPrzezdziecki]

Wow! the best explanation of the subject i've ever heard. Thanks for that. Thanks from Poland!

[@rolinychupetin]

Thank you Mr. Przezdziecki. You are only a few kilometers (miles) away.

[@mohimadvani6425]

beautifully presented and explained. loved it.

[@bryandowdey1779]

A very clear and logical explanation. Thank you!

[@MagicGirlsOnly]

Wow this is the best walk-through of this I'v seen!

[@SamWalsh1]

Your a great teacher, carry on I am learning loads!

[@madagascar2203]

Greeting from Indonesia, thank you very much you helped me so much... i studied Computer Engineering.

[@zez124696]

Better than my teachers explanation. Cheers roliny

[@MA-km5rp]

I didn't understand how you distribute the voltage across RC and RE please someone explain to me ):

[@adassumpcao]

perfect explanation! thank you! :D

[@iplteddy]

Huge thanks from from Norway, these videos has helped me immensely =)

[@rolinychupetin]

You are welcome, thank you for reporting where you're writing from.

[@bEsTnOT2B]

a very good explanation im designing a ce amplifier two stages and you really helped!! thanks a lot

[@akwasi7282]

Thanks a million. This was very helpful.

[@RTD553]

A really nice and elegant explanation. Kind regards. Nick, UK. Physics and maths instructor.

[@rolinychupetin]

+Nick Allen Thank you.

[@Furiouslyfunnyfizzix]

Nice work - well done!

[@1235677890123567890]

Nice explanation, very easy to understand. Big thanks from Malaysia

[@rolinychupetin]

Thank you, Mr. Heidy from Malaysia. Greeting from Canada.

[@fjdarling]

This was excellent instruction. Thank for our effort.

[@rolinychupetin]

Glad it was helpful!

[@panthachakraborty795]

great work sir

[@truckrally]

Great job, i appreciate it very much, ill see more off your videos!

[@ElectrogicsPH]

Hi.very nice approximations.. Is it posssible to make R2 > R1? Why does the voltage Rc is 3/4 of the half and the voltage Re is 1/4? Is it possible to make them equal? VRc = BRe =7.5/2

[@reynaldstfleur2973]

you are one in a million. Thank you!

[@rolinychupetin]

I love your enthusiasm and support. Thanks.

[@itzlagana]

Thankyou from sydney australia

[@rolinychupetin]

Nice to hear from you, itzlagana from Sydney, Australia. You're welcome!

[@NandaPandeee]

Wow thankyou so much from Australia !! :)

[@rolinychupetin]

Thank you for your encouragement and for reporting where you are writing from :)

[@noid2tell]

You are Sir, A Master Teacher! Thanks a lot!!

[@rolinychupetin]

Wow, thanks!

[@sodbuster4411]

Very clear explanation.

[@rolinychupetin]

Glad you think so!

[@MrWkirsten]

Awesome video, but how do I determine the values if I have a predetermined voltage gain of 35?

[@Moha91196]

i was lost ....Thank you from jordan

[@rolinychupetin]

You are most welcome, Mr. Naif. And thank you for including your country in your post. Sincerely.

[@ssttaarrTandT]

U saved the day!!!!

[@abderazakcherfi]

Thank you so much

[@rolinychupetin]

You're most welcome

[@MrVoayer]

Sound advice!

[@kimsoohanmuturtlecrane5532]

THANKS A LOT!!!!!

[@MrHmm-cv6gs]

Thanking you sir

[@rolinychupetin]

You are welcome.

[@rolinychupetin]

@truckrally Jag är glad att mina videor är bevakade i Sverige.

[@sediye]

hero

[@benjamincontreras4361]

how do you determine the value of beta?

[@martinmartinmartin2996]

It is clear from your closing remarks that you have designed a transistor stage has 2 outputs: Ve: an IN-phase voltage output at the emitter Vc ; an OUT-of-phase voltage output at the collector. Vc ~(5.6/2.2)Ve , ACgain=x2.5 ...of course this circuit is NOT a typical AC amplifier due to the unbypassed emitter.

[@rolinychupetin]

Mr. Martin, thank you for your comments. In reality it is an AC amplifier. But we are looking at the DC bias. The emitter resistor bypass capacitor, and the two coupling capacitor (one to the previous stage and one with the following stage or perhaps the load) in a DC model are open circuits, that is why you don't see them there. Please remember that the impedance of a capacitor is Zc = -j/(wC). In DC, the impedance of each one of those three capacitors in infinity, an open circuit, so they vanish from the action. Again, thank you for the comment, because the same idea may have been lurking in the minds of other of my very dear viewers/followers/fans/students.

[@ericlindal8008]

Awesome explanation! Love your videos

[@rolinychupetin]

Thank you!

[@user-ub5su9vj6d]

😇😇😇👍👍👍🙏🙏🙏 really good, great job.