BJTs as Transistor Switches | AddOhms #10
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- Опубліковано 7 тра 2014
- Transistors are electronic switches that are used to control things that would kill an Arduino, Raspberry Pi, or Beaglebone.
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There are two major types known as a BJT and MOSFET. This is part 1 of a two part series, which looks at BJTs first.
Learn what they are and how to use them.
Show Notes:
www.addohms.com/ep10
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#transistor #bjt #electronics - Наука та технологія
Dude I've watched so many videos on transistors and mosfets (lots of 'big' youtubers in electronics) - but your visualizations and descriptions are the best I've found! Nice job man!
Too fast for me even though I kind of know this stuff already
Mother of God: an actually useful explanation of the transistor!
You, sir, are among two other people I've found on both IRL and the whole internet that actually tells how transistors work without rambling about "Holes" and "Electrons" and quantum magic.
Totally agree! A breath of fresh air! I am totally getting it now. Others bire you with way to much theory and equations, that you loose the plot. This guy gives you very simple formula and how and where and why it is used!
How transistors work: Quantum electrons mumbo-jumbo.
How to use them in your circuit: This video.
It's a long time since you've posted this comment, but could you link/tell me where the other two explanations are, if you remember? I'm still having trouble grasping the concept, thankee.
@@edwardfanboy
اهنگ
اگرین
Fantastic video editing and graphics. They both help support a clear presentation. I like this channel. Thanks for the video!
Excellent, understandable and perfectly clear video, Brilliantly done! Thank you so much!
This 4 minute video explained principle of transistor to me better than 3 years of uni and countless hours of other yt videos. Thanks!
I have to echo the positive and very accurate comments made about your video training style. It really makes things real and approachable. I like the suggestions of useful components to use in circuits like your idea of the suppression diode with part number provided. You are awesome--keep it up.
i cannot thank you enough for making this video! i've been trying to figure out for months how bjts work and i just had my "uhuh!" moment after watching your video. i couldn't figure out how to connect the more pictorial diagram for bjts to the schematic and the animation you included just solved that problem. really, thank you so so much!
Bryan D, ...define....."uhuh".....lol
Hands down best explanation! And the practical examples make it even better!
just one word awesome, I was looking for these tutorials quite a longtime.
I'm not an electrician, just a hobbyist but man, your videos are so well done, quick, and easy to understand! Keep up the AMAZING work!!
💖
Fantastic and very informative video, Thank you so much!
I went through transistor theory back in the 80s. I have never really understood it until this video! THANKS!
Really appreciate all of these explanation videos!
You have one of the bests channel here on youtube.
Very nice explanation and with pictures simplified for understanding Thank you with regards
excellent tutorial, with the added animations make it easy to understand....
Even shorter and much more useful guide than GreatScott! ones. Thanks!
very nice explanation! (currently studying electrical engineering and i thought this very insightful - especially the explanation for using a suppression diode)
Real good videos! Thank you very much! Helps for electronic engineering students like me! Greetings from Mexico.
Thanks so much for your explanation!!! It was soooo easy and clean to understand it!!!!! I love it!
Awesome videos man... Waiting for more such videos
Great video and good explanation
thanks for the clear concise explanation
What a great video, full of practical Informations!Thanks!
Very nice video! Keep them comming!
This was a very understandable lecture! Thanks
Clear and concise . Thanks!
Nice video, well done, thanks for sharing it with us :)
I love the little tidbits of knowledge. Such as the Vcc origin's.....
Very good tutorial. Thanks for sharing
Awesome tutorial!
This helped me to understand. Wery good video. Thanks. 😊
Thanks for the (very) clear explanation! :)
Very good video my brother... Excellent!!! Thanks
Great transistor lesson,big 👍 from new friend
Great stuff! Thank you!
awesome and quick explaination
Really nice video, thanks.
Great explanation. Thanks
Nicely done!!!!!
Nice tutorials, thanks.
Muy buen video, regards from Oaxaca Mx.
awesome explanation
Very good job for basic electronics
wonderful! Many thanks!
Easy and cleared explained. Good luck with your job. I will cross fingers.
great explanation
Have you got the PNP video up someplace? Thanks for the content.
thankyou great video
best explanation ever
well done !!!
Here I was trying to build a transistor switch for my raspi withouth ever having learned how a transistor even works (or I did and it's just been too long ago). So thanks for your help!
Thanks for information
thank you for your video
I liked your video as soon as you said BJ transistors instead of BJT transistors.
best explanation
Excellent.
Finally, somebody drops some math... Finally got the concept, thank you!
I had also been struggling with that. All the videos seem to be "dive right in" which is fine if you want to mirror the exact setup but if you wanna experiment, you've no theory to do so.
What are the advantages or disadvantages of using a mosfet to say drive a flyback over using a bjt? Thanks
Fantastic Video! As a studying engineer trying to demystify what the hell I do with a transistor this video is amazing! I'm so sick of hearing about pnp/npn, holes, CE configs etc. How do I apply it!? Subscribed.
Just use your imagination for pete's sake these are tools to preform work with.
Are 1mA and 100mA the maximum of current allowed before it starts to become a risk for the transistors? Also, if the a certain voltage and currency goes from B to E and another from C to E there's an increase of the total voltage or current from E to forward?
thanks. I like it.
Hey there
I have a problem, I have an integrated C.I. PT2272 6-volti want to control relays of 6v but it seems that the output of integrated does not have much power that the integrated output is down 5 volt to 2 volt and the transistor is not saturated that I could use transistor I used the built-in 548 bc is supplied with 5 volts but the relays are supplied with 6 volts is something like what you did in your circuit
thanks for help,
Good tutorial
Fantastic
thank you sir
very good,tks
Did the 3.3v applied at the BASE cause the the transistor to turn on? And by it turning was the 100Ma of current allowed to flow from COLLECTOR to EMITTER?
where can i learn short-cut form (like VIO, HF, IC and IB)?
Great tutorials, thx for the effort you put into these vids. I'm in the middle of a few projects but haven't started using an ICs yet. With the info you have shown here in your tutorials, makes my circuit building a bit easier....and I can stop releasing the factory installed smoke in some of my components lol. A quick question, when would you decided to use relays over BJTs or MOSFETs? Or vice versa...
+OnlyNeed1Shot Relays are good for very high current DC and all AC. You almost always need a transistor to drive a relay's coil from a microprocessor.
AddOhms ok makes sense. Thx again. I have a few AC projects I'm working on with transformers, fans, Motors and such.....but no ICs, so I'm trying to design a control circuit using the components I scavenged from many electronic appliances I have torn apart. Needless to say I have fried a few components while testing my circuits. Maybe I'll try and design a small DC circuit on battery to control the activation of the ac circuit via relay activation.
Please do a video about PnP transistor as well as current amplifier
great video, would you also happen to have one on the functionalities of an IGBT?
+Pierry Louis No. I haven’t worked with IGBTs much. I understand them to be basically a BJT driver for a MOSFET, in a single package. That’s as much as I know about them.
AddOhms oh alright, thanks for the heads up. It's just that you really explain things pretty well and I saw it on the video.
Thank you for a quick intro to transistors. In your example you connected the motor to the collector. Would it be okay to connect it between Emitter and ground instead? What would be the difference between the two?
Bernhard Kohlhaas I was wondering that as well - could somebody explain?
can you use it just as a momentary switch that connects a microcontroller pin to ground?
Have you considered doing a tutorial on the operation and interpretation of characteristic curves of FET transistors?
I wrote an article on MOSFET curves here: www.element14.com/community/community/element14-presents/workbenchwednesdays/blog/2019/08/07/reading-mosfet-curves. And I did a video on the Miller effect here: ua-cam.com/video/bw_ZIye2j64/v-deo.html
am adicted to this channal.
May I know what software u used to present your drawing ?
+John Lim After Effects. Well, that’s what I used today. This one was done in Motion 5. #14 is when I switched to AE
I would like to make a 24V pulse with a width of 300ms with an Arduino to give the logic low/high. Is it possible to use a bjt or MOSFET as a switch which the logic low/high is fed into?
Yes
Great tutorial! Very clear
Nice explanation, but I was so hoping to get an insight into PNP BJTs, and what the point of them are.
Something I plan to cover later. A quick generalization is that NPN sinks current while PNP sources current. So you'll often see them used to switch "on" a path to ground. While a NPN will be used to switch "on" a path from the positive supply.
They're very popular in differential amplifiers and can be used in push-pull amps used for audio.
Why did you pic "100" for the Current gain from the datasheet. I don't understand that part. There were other numbers to pick from. Why the 100?
Good question.
The reason I picked 100 is from experience with a 3904. There is a range of values which depends on the voltage drop from Collector to Emitter and then how much current is flowing through the collector.
Also notice that the range is from a *minimum* value to a maximum value. So even if your conditions show 30 on the data sheet, its likely going to be higher anyway.
God bless you for the animations and clear visuals.
I'm going to cancel all plans this weekend in order to feast on your channel :3
1:45 I've always wonderd what the CC meant in VCC, now I know!
Yep
Helpful video but correct me if I'm wrong, I thought the data sheet said the "beta" would be 70 at 1ma, not 100? 100 was for 10ma from base to emitter?
Beta depends on the collector current not the base current. Both temperature and the voltage drop from collector to emitter can cause it to be different as well. It varies on such a wide range of conditions that it is difficult to state a single value. However, for a 2n3904, 100 is a common number that is used.
Ein Lachen Mittagessen....Wünsche....
Hello. I want to make a transistor switch for a high power LED that consumes 700 mA. The switch will be controlled by a 5V Arduino. I made the current source by using a LM317T. I am between using a TIP29C BJT and a IRF510 MOSFET. What would you recommend? Thank you.
mmitza The 510 may be overkill, I'd go with the TIP29C.
@time 1:55 How did u calculate 1ma of current of u only had the voltage and not the resistance?
I didn’t. I just picked the value.
what is that voltage spikes??
Dear AddOhms, just one question, Is the bjt transistor completely unstable to temperature? I mean without an emitter resistor or a heatsink Collector Current will keep getting bigger even if the initial one is around a few milliamps?
Yes. Their gain is temperature dependent. It’s why I rarely use discrete transistors as an amplifier. I’ll use an op amp instead.
is the AUDIO TO 11 a reference to The Spinal Tap? :D
+squalazzo Yup. :-D
1:54 , 1mA is flowing from B to E, and then u said when that happen we get 100mA flowing from the collector to the emitter. what i don't understand is from where we get that 100mA current? i mean the collector isn't connected to anything, so it's like an open switch.
great videos by the way, keep it up!
+Heisen Berg It is implied that the collector is connected to a supply.
Hmm, as i think about it, my question was really dumb haha, i'm new to electronics.
Thank you :)
Pretty valid question, I was missing that too. While I knew he probably meant to add a PSU. A video for beginners shouldnt imply stuff which make things vague. Other than that one of the better videos on using transistor in practice.
Pretty clear video...... Thanks v much Sir. 👍
Very good tutorials, teachings indeed. However, i think it will be better if you can make a real circuit including the component in the tutorial. That makes things a lot clear (at least for me) when components are in action.
'The code's more what you call guidelines than actual rules' Hector Barbrossa
Great video ! Maybe you can make a portuguese subtitle for i send to my friends in here on brazil.
Thanks !
thanks
Can I use BJT to replace motorcyle relay? The voltage is 14.4V. I got so many relay and cable that I need to simplify. Not really sure about the amperage, but I guess is around 7A or more.
7 Amps would probably require a PowerBJT or a MOSFET. No matter what transistor type you pink, you'll likely need to heat sink them. If the signals are pure DC, then a solid state transistor is an option. However, if they are AC, then no, a simple transistor will not work.
@@AddOhms thank you so much for your reply. It's a full wave DC with 2 phase stator. I already tried the circuit with 10K resistor, a T-10 socket LED bulb and a 12V 10A adaptor on a breadboard, and the BJT seem fine, no heat on the BJT and resistor. I'm going to test the circuit again on my bike tomorrow. I'll tell you the progress.
@@AddOhms The collector current turn out to be very low, it's unusable. I use a combination of C945 and 2N5601since I only have positive signal. Any suggestion what MOSFET should I use to get those 8A pass through completely?
such a clear and concise explanation that makes me wonder what sort of people would thumb it down. Idiots that can't understand probably.
Nice tutorial. Could you please guide me, I need your help in understanding how to convert 230v dc to 230v ac using transistor.
You need to build an inverter.
@@AddOhms inverters are 12v 24v or 48v. I have a power bank of 230v dc can I use mosfets to convert dc to ac without an inverter?
Is there and BJT PNP video?
Please help! I can't understand that pnp transistor 😓