BJTs as Transistor Switches | AddOhms #10 

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!

Fantastic video editing and graphics. They both help support a clear presentation. I like this channel. Thanks for the video!

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.

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!

Excellent, understandable and perfectly clear video, Brilliantly done! Thank you so much!

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.

very nice explanation! (currently studying electrical engineering and i thought this very insightful - especially the explanation for using a suppression diode)

excellent tutorial, with the added animations make it easy to understand....

Hands down best explanation! And the practical examples make it even better!

I went through transistor theory back in the 80s. I have never really understood it until this video! THANKS!

This 4 minute video explained principle of transistor to me better than 3 years of uni and countless hours of other yt videos. Thanks!

Fantastic and very informative video, Thank you so much!

Real good videos! Thank you very much! Helps for electronic engineering students like me! Greetings from Mexico.

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!! 💖

Very nice explanation and with pictures simplified for understanding Thank you with regards

You have one of the bests channel here on youtube.

Thanks so much for your explanation!!! It was soooo easy and clean to understand it!!!!! I love it!

Even shorter and much more useful guide than GreatScott! ones. Thanks!

Really appreciate all of these explanation videos!

What a great video, full of practical Informations!Thanks!

thanks for the clear concise explanation

Great video and good explanation

I love the little tidbits of knowledge. Such as the Vcc origin's.....

Awesome videos man... Waiting for more such videos

Clear and concise . Thanks!

This was a very understandable lecture! Thanks

Very nice video! Keep them comming!

What are the advantages or disadvantages of using a mosfet to say drive a flyback over using a bjt? Thanks

Awesome tutorial!

This helped me to understand. Wery good video. Thanks. 😊

Very good tutorial. Thanks for sharing

Very good video my brother... Excellent!!! Thanks

Nice video, well done, thanks for sharing it with us :)

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!

Have you got the PNP video up someplace? Thanks for the content.

Great transistor lesson,big 👍 from new friend

Thanks for the (very) clear explanation! :)

awesome and quick explaination

Muy buen video, regards from Oaxaca Mx.

Great stuff! Thank you!

Great explanation. Thanks

Nice tutorials, thanks.

Really nice video, thanks.

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?

Very good job for basic electronics

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,

Easy and cleared explained. Good luck with your job. I will cross fingers.

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.

awesome explanation

Nicely done!!!!!

wonderful! Many thanks!

great explanation

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?

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?

best explanation ever

thankyou great video

Thanks for information

thank you for your video

I liked your video as soon as you said BJ transistors instead of BJT transistors.

@time 1:55 How did u calculate 1ma of current of u only had the voltage and not the resistance?

well done !!!

best explanation

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.

where can i learn short-cut form (like VIO, HF, IC and IB)?

Finally, somebody drops some math... Finally got the concept, thank you!

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?

Excellent.

great video, would you also happen to have one on the functionalities of an IGBT?

can you use it just as a momentary switch that connects a microcontroller pin to ground?

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...

May I know what software u used to present your drawing ?

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?

what is that voltage spikes??

Nice tutorial. Could you please guide me, I need your help in understanding how to convert 230v dc to 230v ac using transistor.

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?

is the AUDIO TO 11 a reference to The Spinal Tap? :D

thanks. I like it.

1:45 I've always wonderd what the CC meant in VCC, now I know!

thank you sir

Good tutorial

Please do a video about PnP transistor as well as current amplifier

Fantastic

very good,tks

how can I use this to cut the voltage in 1/2 for my slot car? the track is 14 volt. I have a car that is max speed and powered directly by the track, no controller. I want to cut the speed in 1/2 and then it can drive itself around the track w no controller.

hi, can I make reset switch for microcontroller using a transistor instead of push button ......?

Nice explanation, but I was so hoping to get an insight into PNP BJTs, and what the point of them are.

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!

Have you considered doing a tutorial on the operation and interpretation of characteristic curves of FET transistors?

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?

How do you know whether you're facing the front or back of the transistor? Or does it not matter as long as you wire them correctly? ?

I do understand that there would be voltage spikes but, how does the diode in parallel to the motor protect the transistor from voltage spikes?

What can be happen without diodes ? I searched "voltage spikes" but couldn't understand exactly what is that and consequence of that

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.

Great video ! Maybe you can make a portuguese subtitle for i send to my friends in here on brazil. Thanks !

please can you tell me how did you know that IB =1 mA ?

Hello my name is Mitch I have a question that I know you can do for me . It go's like this I have 12/volt DC when on wire that I must keep this way but when I turn it off it has low 5 to 6/volts on it this is normal , what I want to do is put something on the line so the low volts can't pass thru and hurt my 12/volt only part. But when 12/volt comes on I want that to pass thru so it can turn on my part. Please tell me how to use this one wire to get the high volts out only , this is for a car . Thank you

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.

Im a newbie if transistor act as a switch w/out human intervention then which of the component send signals to turn on and off the transistor or stop supply and closing current to the base without a switch Enlighten me thanks

Hello, can anybody explain why in 3:50 the consumer(fan) is connected *before* Collector, instead *after* Emitter??? What's the difference if any?