Transistor as a switch, how to calculate base resistor's resistance? || Bipolar Junction Transistor.
ฝัง
- เผยแพร่เมื่อ 9 พ.ค. 2024
- HK CREATES UNIQUE!
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The video shows how to use a Bipolar Junction Transistor as a switch.
Watch Transistor based timer workings : • Transistor based Timer...
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In the video, I said that current gain is not an important factor, What I actually meant is that value of Current gain is not needed to be accurate, to saturate a transistor high enough base current is required, In the equation you can assume beta value to be low (around 10) so that base current gets higher.
Also, As beta value changes with temperature, taking lower beta value solves temperature variation problems.
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TIMESTAMPS
0:00 intro
0:49 electrically activated switch
2:57 About Relay
3:36 About Bipolar Junction Transistor (BJT)
6:37 Advantages of Transistor over a relay
7:21 Current Gain of a BJT
8:13 Transistor as OFF switch or as ON switch
9:59 Base resistor calculation
10:59 Base current from same source
11:32 Practical example of Base resistor calculation
13:41 outro
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About myself-
My name is Hrishikesh Kalita,
From Pathsala, Assam, India.
Time it took for me to make this video- 50 hours+ in a span of 3 months.
Music I used: "Dreams" by Bensound.com
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correction:
0:22 I said that it is 100 x faster, which is wrong! Smartphones are actually millions of times faster than the ENIAC.
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It would really help me if you share this video with your friends. It will motivate me to make more videos like this. Thank you!!
The way you are explaining is very very simple understanding bro... thank you very much.... for your hard work...🤝💯
I finally understand how a transistor works now. After more than 20 years of trying to understand 😅. Thanks bro. Gonna watch it again
I guess the rest were teaching us how it works, instead of how we are going to work with it😂😂😂
Subscribed 😊,keep doing such useful contents
Simple and straightforward! Nice!
this by far the best explanation of how the transistor works. thank you so much HK
Very helpful. I was struggling how to interface my ESP32 GPIO pins to a 5v relay, as the pins give 3.3v. This video informed me on how to use a transistor to switch 5v to the relay using a 3.3v input to the base
Hope your hard work reaches the world. Even being a non Engn student, I could understand everything! You made it so practical and easy to understand. ❤
Thank you so much!
Agree. Circuit design textbooks loaded with equations do not teach you practical knowledge of this kind.
👍👍👍 Nice to see an excelent video explaining those functions, when I began in Electronics there was nothing, 50 year ago...
You been in electronics 50 years?! Wow! 😯. I've been into electronics 37 years (since 1986)
Sweet. Directly to the point. Thank you.
Thank you. Very helpful and clear. I recently found a textbook in a used book store called "Basic Mathematics for Electronics". I am looking forward to studying it since it will just cover what I am interested in for electronics math more directly than other books I have found. Please keep making more videos as your time allows.
That was very well explained - excellent!
really good illustration. keep up the good work
Excellent. Well presented. To d point without ambiquity.
very well explained thank you well done😊
Master, thanks. You gave until now the best and practical explanation. Keep the good 👍 explanation, and your channel will grow 👍
Very clear! Thank you.
Best vedio of electric science 👌👌👌
Thankyou! I like your simple explanations and I have subscribed.
Very cleaver and important explanation.
Great video bro❤, liked every part of the video, keep it up 👍🏻
Thank you bro😊
Nice Explaination my dear 💕brother❤👏
Excellent job ...This educational video help all students specially class 7th to 10th❤❤also higher secondary students on electricity part 👌👌👌
Highly informative.
Informative
Great work bro!!
Top explanation...TKS bro
Nice EXPLANATION 👍
Good explanation!
THIS WAS GREAT!
Fantastic . Very easy to understand in electronics circuit. Thank you
Good job munu❤
Very good class
Top explain...Very good...
Great job!!
Wao ,this is great🙌 keep it up...
Thanks a lot 😊
Kindly made some effective videos on SCR control, IGBT and opamp as transistor has been made. I am looking forward to your support. Thank you.
Good explaining.
I like the way of teaching I am beginning to remember what I had forgotten
Me too, lol
Really very nice ❤
Wow😮 nice video bro i will use transistor as swich❤❤
Very good. Keep going.
Very well said sir..thanks
СУПЕР !
Very good sir
Hrishikesh, khub bhal.😃
Thank you😊
@@HKCREATESUNIQUE welcome
good explain thanks!❤
Good class go a head 👍
I really really enjoyed your teachings ❤❤❤ I would love to be your student Sir
I usually don’t comment but keep this up bro it’s gonna payoff
Excelente.
perfect explanation
Thanks! Please check my latest video on timer.
The 2N3904 and 2N3906 are more common in the US.
Common Emitter Configuration👍Thanks
That's because I used 2N3904, I found that my BC547 was damaged while filiming that part, But I had made animation on bc547... I had no other way but show that . It is still common emitter, see pinouts of 2n3904
...best explained
May the force be with you
Very Good information. Thank you.
Salute ❤💛💚
Than you
Good teacher❤❤❤
Hello! Good video! I`d like to add (form my experience) about turn-off a transistor. When a current ( several milliAmpers for low power transistor) flows through a base-emitter junction, our transistor goes into saturation. It means - that if we easy interrupt a current of base - the current through collector stay flows during several microseconds. To avoid it we can change polarity of base-emitter voltage when we want TURN-OFF. It can be does by RC circuits or the Shottky diode.
Thanks for the info! I should be learning more from you! I will subscribe to your channel😊
nice uploading
This was a very well made video, one thing to mention is that you may want to have a slightly higher base current than calculated due to transistors not being always fully on at 0,7volts and it may vary even between same types, in case it would end up in a semi on-state the transistor will run much hotter and the output may not be stable :)
Yes, true but in my case I used lower beta, e.g. 10. This increases base current ensuring saturation
@@HKCREATESUNIQUE indeed. I thought I mention it as many probably don’t know this and bias the transistor in a way it might fail when the margin is small. Also as the base current also increases when the collector-emitter current does, thermal drifting etc might also play a role here
which resistor is used with ldr and 547 transistor with input current of 70v-240ma
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Sir, give me the sound watts equation relation between rms&pmpo.
Can a voltage lower than 0.7v activate the transistor switch?
I know I remember 0.6v turns em on back in 1986 when I got started on elections. Guess we just haft to test and see
Sir.. is the value of 0.7volts supplying the base of transistor applicable to all types of transistor in order to conduct it? From the Philippines
Only Bipolar Junction Transistor
@@HKCREATESUNIQUE thank you sir.. for the clarfication! ....
@@HKCREATESUNIQUE excluding conventional Darlingtons 1.3V di ba !!
Like
how’s to knows all electronic part without imformation for its
Not bad at all,but I'd contest beta value of 10 for small signal transistors. Usually declared within 100-500 range.
You are right but here we are using transistor as a switch, not an amplifier. To saturate a transistor high enough base current is required, In the equation you can actually assume beta value to be low so that base current is higher.
Also, As beta value changes with temperature, taking lower beta value solves temperature variation problems
All these I learnt from books as well as from experience
Thank you.clear and concise answer
@@HKCREATESUNIQUE So Beta cans sort of just be guest, as long as it's well below the actual Beta of the transistor? - Isn't that dangerous if one chooses Beta too low as the transistor can be destroyed by too much base current?
Yes, too much base current will destroy, choose beta above 10,never below it.
And the reason for low beta is to allow excess base current so that the transistor saturates.
Why didn't they show it like this in tech school 52 years ago? Yup, I'm old. :)
❤❤❤Ok
Its a very informative vdo. Thanks. I am a non engr and learner. Can u pls tell me how did 5816 ohm came from 7.97-0.7/1.25. Sorry if missed aomething or the ques is foolish.
Thank you so much for watching,
The question is not foolish, the reason why 5816 ohms came is becase the base current is in mili amperes, (1.25mili) and mili means 0.001 or 10⁻³ . so 1.25 mili equals 1.25 x 0.001. That is the reason why 5816 ohm
How to create normally closed switch with transistor?
Just use transistor as a not gate, it will work that way. Check on the internet
i never trust the math and i check the specs for v and measure the v on the wires hooking directly to the transistor usually i trim with a trim pot !! they pop super easy if they are rated around a volt or so !! try to get transistors that have 20v or higher on the base and your not
stuck with trim pots !!
Good video this problume Urdu language
😅😢😢😅😅well ingormeti0n.Good show 😅
RB =7.97-0.7/1.25 = 7.41..
Kindly explain your calculations
In the equation, 1.25 is in *milli* amperes. I have mentioned it on the video, please check!
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You are wrong !! Colossus at Bletchley Park in England UK was the world first programmable computer !! ever heard of Alan Turing
❤ first comment
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Gigabrain
The modern smartphone is about a billion times faster than the Eniac. Right?
Yes, that was an error in my script,I actually updated it in my video description
NOT 100x, but ?000,000x faster as in millions of times faster!!!!!! ...please get your facts right!
Unfortunately this description doesn't take into consideration that "Beta" ( static current gain) is not a fixed value, but instead has a range of values: thus value of Beta must be selected properly!!
You are right but here we are using transistor as a switch, not an amplifier. To saturate a transistor high enough base current is required, In the equation you can actually assume beta value to be low so that base current is higher.
Also, As beta value changes with temperature, taking lower beta value solves temperature variation problems
It's s a though job to understand what this individual is uttering... ☹️☹️
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Can a voltage lower than 0.7v activate the transistor switch?
No, voltage below 0.7 volt has lower base current(see V-I characteristics of pn junction) Thats the reason why it doesnt activate