SparkFun According to Pete 7-5-11: Diodes and Transistors

Tags: ATP
Talent: Pete Dokter

[@bajeeburs]

Thank you Pete! these tutorials are perfect as a reminder for what i forgot. An enormous help!! I'll be recommending these videos to my friends who want to get involved in electronics. Love you man!

[@rmhcheeng]

Got to say, I love these videos. They not only explain what happens but also why. I can dig that. Thanks for this, Sparkfun.

[@MrEkg98]

Good Job. I have known ohms law for years but never applied it much. Been trying to brush up on my topics that is not covered in my schooling for my field of employment. I been stumped for a few days on how to calculate the base resistor and led resistor. You clarified this for me very well. Your video is even better at clarifying this than the text based page on sparkfun. Good Job.

[@ElectronicsAustralia]

Very helpful little video! Nicely done! Easy to understand and concise which was great! Can't wait to see your next one :-)

[@el8tion]

Great videos Pete!!!!

[@youwouldbetterfuckme]

Wonderful vid! Well-explained in very easy & light way. Thank you!

[@Sirvolta]

These videos are awesome, keep it up! I'm trying to follow as best I can haha!

[@MrMobileWill]

Thank you so much! It solved my problem where the transistor wouldn't turn the camera on 100% of the time. I needed the resistor on the base. This made me think that resistor was missing since the other camera has it and works fine. Thanks again!

[@Loompia]

not going to lie, you make ee material much more entertaining to learn than my school

[@TheRogerx3]

I should have payed attention.. Note to self, watch again. : )

[@thegnawirasta6157]

thank you pete

[@nickmpogiatziou2133]

extremly helpfull tutorials

[@schuyoff]

Yay! More "According to Pete"!

[@leftysloft5030]

Thanks for making this. I'm buying you a new DE marker.

[@jankohout2043]

Dude this was actually pretty helpful. At least for me it's kinda hard to get the electrical theory to work in practice and to integrate that what has been learned to the workbench. I get lost beginning to design a circuit like this. But i think next time i wont just blow it up again :-) Thanks!

[@voyasart]

Exactly what did we do in this video. What is uC? How did we use the hfe at all?

[@sparkfun]

@HenrikN449 Good point! I will start labeling them.

[@Dysl3xicDog]

@sparkfun Could you do a video about Zener diodes specifically?

[@BitwiseMobile]

Well dipole fall off (at long distance) approaches 1/r^3 (inverse of the cube of the distance between the poles), so maybe it's related somehow? It might be behaving as a dipole with the two opposing charges at the junction.

[@user-wg1gg4yz4i]

I think that the voltage drop on silicon BJT is 0,7 Volts, but not the 0,6 Volts. And the voltage drop on JFET's is 0,434 Volts.

[@dorkzism]

great job man. its like im in auto class again. only its funner

[@rv49er]

@w2aew Agreed. I never saw an example that showed electron flow.

[@Dibblah1900]

Cool. Another reason not to use the transistor to limit the current (in a linear way) is that the power is then dissipated in the transistor - Which would be bad.

[@prahladsharma5937]

Hii Pete thanks for make The transistors video, i learnt more i have a question if I am connecting a load across to Emitter in npn and i am applying a 5 volt on base to emitter and 50v collectors to emitter also collector side a resistance is connected, when I am c

[@prahladsharma5937]

when I am checking a voltage across load (emitter side) and ground . i found 5volt why?

[@doodh_jalebi]

I have a question. What was the type of current he was talking about when explaining transistors; conventional or the other one(sorry i cant remember the name)?

[@p.ben.8177]

I would prefer he refer to conventional current instead of electron flow.

[@HSPalm]

The video title or description shows in no way that this video is about transistors. Makes it very hard to follow the series over time from the subscription service, and to re-locate an old interesting episode

[@upmperthay]

For those who wonder, 2 diodes WILL behave like a transistor. They just can't handle much. Try it on an oscilloscope before you doubt it.

[@Agent24Electronics]

Not bad but I think you should have said more about diode breakdown voltages - especially the fact that breakdown doesn't destroy the diode as long as the current is limited.

[@GTechno13]

I agree with others. Using electron flow rather than conventional flow can be confusing to some.

[@larryshaver3568]

some diodes are/were germanium though

[@zdenekk950]

I wonder what made him pick 5mA as the driving current. How should one read that value out of datasheet?

[@JeffRatliffhome]

+Zdeněk K It was probably just a guess. However if you look at the datasheet for a 3904 it gives a rating for Base saturation voltage at 5mA (that is, it lists the saturation voltage when current is 5mA). So that is probably a good guess.

[@RoyAndrews82]

Correct me if I'm wrong, but as long as the base current doesn't go below the Ibex (base cutoff current), the transistor will stay on. Which according to the datasheet, it's 5 nA (0.000,005A). Is that correct?

[@strongbad2795]

The sound on this video is horrible compared to the New Products posts. There's a lot of hissing in the background.

[@kyoteecasey]

"Garden Variety"

[@jwtfpv8957]

If I was a woman I'd have your child! Thanks so much for this video. :)

[@Galfonz]

Isn't that 1/2 watt resister going to drain my battery?

[@talideon]

That's how much power it can deal with, not how much it'll consume.

[@jamesmasonic]

Why do you show current directions the inverse way ? Isnt load curent direction is from collector to emmiter. You show the other way why?

[@whitepickle1]

+jamesmasonic you speak of conventional current, the arrows he drew shows the flow of electrons

[@AlexBolm]

U*I = P ?

[@smartroadbiker]

100mA = 0.1A 0.001A = 1mA :)

[@zdenekk950]

Example 9:10

[@SuperDhrumit]

A

[@spoddie]

don't draw electron flow!

[@unknownpresident]

Electron flow is correct , its the dumb slow scientist that got it wrong !