Electronics - Using an NPN Transistor as a Switch
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- Опубликовано: 11 май 2011
- This tutorial shows you how to use an NPN transistor as a switch.
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this is perfect. i've wasted about an hour watching so many videos explaining this in such depth, when all i needed was a simple demonstration. thank you!
Ayyesha
me 2 bro i feel ya
#metoo
I've been trying to wrap my head around transistors for a long time. You connected all of the dots for me in 6 minutes. Really useful viewing for the concepts.
Not to pile on the following comments, but this 6 minute video/example explained more to me about transistors than 2 hours of other videos explaing what Transistors are. I now know exactly how to use Transistors in my project. Thank you for making this video.
Thank you for this tutorial. It was very to the point, which most seem to lack.
This was by far the best explanation about transistors I ever found. Very well done Michael.
Thanks so much for the dumbed down explanation of what NPN is. Makes it easier to understand that emitter, base, collector
thank you.. As many times as I have used them.. i learned more in a min with you then years.. thanks for the video...
this is the BEST practical demonstration of using a transistor as a switch. Def this one for practical and "great Scott" for theory. please do more!
the Scorched Earth breadboard absolutely made my morning!!!
Great video, straight to the point and useful. 2 things: First of all, the name transistor has nothing to do with the number of pins, 3. The prefix you're thinking of is "tri" not "trans". Anyway, the second item is that NPN does not stand for negative, positive, negative; that is, the "layers" of silicon are not called "negative" or "positive". Instead, they stand for "n-type" and "p-type" doped silicon. If you would like to learn about doped silicon and what these letters stand for, I'd recommend searching "how do transistors work" and instead of finding a video on how to use them, find one that explains how they function. Have a great day!
The same thing is getting explained in 20 min videos, but at the end I got nothing. Your video is super simple and to the point. Thanks a lot!!
This video completely delivers on its promise. I can see how this would solve a problem with integrating Arduino and the Adafruit fx board. Thank you so much.
Nicely done, you explained the functions of NPN transistors and showed simplistically how to wire them in. That's what I wanted, thank you :)
Well I must say after watching this video and your other video on how to tell the difference with the pnp and npn you have made me fully understand how these work which in turn I can now start to complete a project that just kept failing. the NPN cures the problem. Thanks a million and I have subscribed to your channel
I've watched 10+ videos and yours was the best!! hats off to you
from the other transistor vids yours was the most straight forward and simple one so i finally got it "subbed"
This is a great video. It explains how transistor works in the simplest form. Keep up the good work.
Good vid, no filler, all info, good job!
finally, I understand how it works. I watched many videos about transistors and didn't really get it. Your video showed the transistor by example. THANKS man! :)
Thanks buddy, I'm new to electronics and this video made it easy to digest the workings of a transistor.
Great vid. After watching a 90 year old explain this in about 3 hours. I still didn't understand. You did it perfectly in about 6 minutes
nice video. I couldn't find a transistor tutorial dealing with practical application for beginners. this gave me exactly the information I needed to have. Thanks!
michael, thanking you for your video. It has some time made, and i was searching some to explain. Your demo is the most easy to understand and a great way to show it. I always had thinked that, analogic electronics is more stable than digital. I've been seen nowadays youtube shorts, and there's proyects using this.
But the most important, is expain how they works.
Short and to the point. Thanks. I must've watched about five videos before I found this one.
This Is the first transistor video that I have seen that actually explains how it works, All you need is a good camera man and you are set!
I finally understand how they work i m new on this and you are the firth on youtube explaining the way i can understand tanks
thanx michael - at long last an easy to understand tutorial about the switching option of a transistor. great to watch - thank you for sharing. yayyyyy
thank you for the vid, I was trying to figure something out with a project and this helped a lot!
Thank you Michale judge, it's very informative and clear explanation of NPN transistor, good job dude..
Michael,
Thank You for this very elementary explanation of a NPN Transistor. I have searched, read and watch so many poor examples that I was total confused about the proper wiring of the NPN. This video was exactly what I needed. Thanks Again
Simple. The best explanation so far! Thanks Sir!
Hi, I'm student from korea, and I really thank you for your explaining.
Thanks mate. I was trying to use a transistor for my 5v motor. You just solved the issue.
Thanks, this helped a lot, all the other tutorials are confusing and don't make sense.
Thanks for the demonstration.
So given that I have "some" NPN transistor. How do I figure out which resistor I need to use before it? E.g. I want to switch it with 3,3V (ESP8266) or 5V (arduino uno).. what would be the process to determine which resistor I need?
Thanks, I needed this. I'm using it to set off a reed switch. It uses very little currant.
Thanks for a simple and informative video.
Thanks for the video. Was going to use one in place of a switch on a laser pointer, this answered some questions I had!
"Good"; Thank You, thank you very much...
Do you have ANY additional videos on transistors or transistor technology?
Let me know...
Excellent simple precise explanation. Thank you!
Very instructive and easy to understand. Thank you very much!
Thanks Michael, this was very helpful!
Thank you so much for your video, that's what i needed to know to figure out the circuit im working on.
bro! thx for this vid understood everything i needed to, thanks again man!
Excellent tutorial, Michael! A simple topic, to be sure, but many noobs (we ALL were, once) will find it helpful. I was also surprised at the pin out designations for the NPN. I'm gonna' have to look closer at the datasheets. Well done!
joe
Thanks for posting this, great example and explanation
Very useful and easy to understand video!
Hi! made the curcuit and tried with different resistors. The higher the resister the lower the led lights up. so it is not just an on off switch?
Generally the resistor that you should use for an LED is that which would result in the current passing through the LED to be 15mA. So if you're using a 5v battery, and the LED drops the voltage by 2v down to 3v over the resistor, then in order to get 15mA you'll need 3v/0.015mA = 200Ohm. It's good to know so don't forget that ;-).
Thank you so very much for clear demonstration...please keep up the great job....Isam
Thank you very much for this video! It's very informative, and helped me a lot understanding how NPN transistors work, even in english which isn't my native language! :)
Thanks again!
Thank you, could you please do other videos regarding use as an amplifier and also for a pnp?
very concise and informative video. Thank You!
great video i look forward to learning more about these i am thinking of getting an arduino
very very nice explanation... i already know all of this but i like looking at new explanations and yours are awesome... congrats and thank you mate
why you need a resistor on the B pin transistor ?
someone already asked i think but i dont understand you reply, about if I have a 5v circuit, I want to control 35v for coils, it is possible? if yes, how I connect it :)
so like 5v pulse that activate the 35v on the transistor?
Very well explained and demonstrated.
Thank you Michael! Very easy to follow.
Hi Michael, why do you need a resistor before the LED? Is this to limit the amount of current the NPN transistor sees? So as not to blow it out? Could you just put the resistor between the LED and the transistor so the LED is seeing the full source but can still be switched on and off by the transistor? Thanks!
I have seen your video of Transistor as switch. Can you please explain what happens inside the transistor in terms of electron and hole flow which make it as a switch. ?
Michael I am going to learn a lot from you! thanks for your videos
Thanks man , any info is great those are clear instructions.
HUGE THANKS TO YOU BUDDY!
it's like half a day I'm trying to get a transistor to work (yeah i know I'm dumb) but after dozens of vids I still can't get it working.
I got no school, no background about electronics but still I want to make a driver for a high amps mosfet and be able to make a brush less motor spin; and you just said that it needs a resistance between the 5volts and the Base and that made the trick!
Yeah I know it's stupid and it'll be hard, but that's the fun part :D
thanks dude, couldn't get mine to work until I watched this
This explained it very well, thanks.
can u help on making LED as an indicator when output of timer 555 connected to the transistor as well as to the relay
Perfect information keep it up dude keep up the good information☺☺☺☺
Thank you! finally a good explanation fo a transistor.
thank you for the video. was looking for the basic working of transistor
Hi Michael,
Great video.....do you have the circuit diagram for this ?
would it make a different connecting from other side? emiter to led -, and colecter to the ground?
Thanks for this video. It helped a lot for my hobby project :)
Excellent explanation. So, does this mean that it can be used as a kind of NO/NC relay?
thanks. for making such video... this video really helped me to do my first project.. :)
Micheal. Thank you i didnt understand schems on other videos at all keep up the good work bud subscribed. Thumb up keep uploading more ty.
Thank You.Would you please tell me how to use mosfet transistor in a circuit.
This is the best video on using transistor as a switch. Thanks a lot manh!!!. Can you please enter the transistor specifications
What would be the best way to connect this resistor to basic automotive wiring? Solder?
Thanks
Hey, I will like to ask if I need to ground my connection to the base? I'm using a DAQ to send 5V Digital Output to the base as a switch. Where can I connect my DO output to ground?
Marcus Cheong Hi there, sorry for taking a long time to reply.. You would need to connect the ground of the DO output to common ground.
The whole point of using a transistor as a switch is to use a _small_ current or voltage to control a _large_ one. What you missed out was that you can use a larger resistor going into the base, which then drives a small base current, and that then controls the much larger collector current.
In your circuit with a 5V supply, the LED will drop about 3V, leaving about 2V across the 47R resistor, giving a collector current of roughly 40mA which lights the LED brightly. But you only need design for 2mA as your base current, so you could use (5V / 2mA = 2.5K) something like a 2.7K resistor connected to the base to switch the transistor on fully.
Very well explained. Thank you
hello. i did the same circuit as the one you showed in the video. but there is a problem that even without connecting the base of the transistor to the 5 volts rail, i still have a closed circuit. i used a multimeter to check the voltage of the led part and the value just increases by some decimals after removing the connection of the base to the 5 v rail.
thanks a lot! as a starter in electronics this was really helpfull. thnx!
Could you use this method to turn LEDs on the 3rd channel of an RC car instead of using a control switch
This was very helpful. Thanks!
Great job man , thanks for the help .
your video is informative keep up the good work
thanks for the video,my doubt is, can we connect emitter and collector reverse in this particular case ,if no why?
Great demonstration use of NPN, it is best for basic thanks alot
Hello, friend!! Could I use a transistor like that as a Webcam trigger?? I have some project that needs to sincronize Webcam photos and a motor moviment... Any suggestion??
good video. very clear explanation
You are THE GUY! Save my life! Thanks! :D
Thank you so much for this.
What would happen if you would give the base of the transistor without a current limiting resistor? I think you said "doesn't matter what kind" so a 330Ohm (I think that's what you're using) is basically ok no matter the input voltage, current drain etc? Thanks again!
This is so helpful! I do have a small question: what resistor types did you use?
Thanks, I finally understand how they work!
truly helpful video....for new beginners
Hey bro. Trying to mod an xbox 360 controller. I got a microcontroller with 16 digital ON/OFF pins. When it's on it's 3.3 or 5v can't rememeber. Off is 0v. I'm thinking of using transistors to control buttons via the pins. the controller uses 3.3v on the buttons and has it's own separate battery. When my software tells pin 1 to turn on it will pass 5v into the transistor, triggering 3.3v to pass and make the button become pressed. I've only got one shot lol so is there anything i'm missing?
In the receiver ckt how to turn on the buzzer when output of TSOP1738 receiver ic becomes high if we are using npn transistor
Any npn part number can be use as a medium switching transistor?
Fabulous tutorial by you