What is a JFET and how does it work?

Рет қаралды 38,428

Күн бұрын

Пікірлер: 38

@Carlosram710 Жыл бұрын

i wish i had this videos as reference or help when i was in collage, there were a lot of student that couldnt understand without visuals, we only had old books and lectures. I hope the youth find them useful. thanks

@jerrylarson9889 7 ай бұрын

This was a great summary and visualization. I literally finished my lecture notes and came here for a clearer understanding

@JonDeth Жыл бұрын

*Your videos save me a lot of time rather than reviewing my school notes from 10 to 13 years ago. I have literally 100 pages for just about every device and every theory.* I will still have to dig out formulas, but that's trivial compared to brainstorming a new device or invention and what will be the best IC or semiconductor for the project.

@CircuitBread Жыл бұрын

Wow, those are some intense notes! I'm glad we were able to help by simplifying some things. I just checked and see that we DON'T have study guides on JFETs (or any device besides BJTs) so I'll have to ask Susie if we can come up with those as well to make it easier to find the important formulas. Have fun with your reviews!

@JonDeth Жыл бұрын

@@CircuitBread for sure. I realized at about 2 months in, I was rewriting the entire topic and lessons into my own words which was superior to the challenging presentation of curriculum, but we all know this has a purpose. One day when checking my mailbox, I discovered my school sent a thorough and condensed review of 1-3 pages for every lesson, quiz and test. A great source for reference and my notes are there if I need to go deeper, but your videos are just a superb alternative. *Condensing formulas for a set topic and the notation would still be monumental though.* I've watched your videos and realized that I fortunately have not forgotten much of anything as I had feared, but the formulas and some notation are definitely the exception. *The current students that find your videos will be eternally greatful.*

@Turco949 7 ай бұрын

Even for someone like me with no prior electronics training or knowledge, this was easy to grasp. I first learned about Boba Fett, then MOSFET and now JFET!

@CircuitBread 7 ай бұрын

Glad it helped!

@suryaedits9046 7 ай бұрын

Excellent video for JFET superb.... We need characteristics also kindly upload soon...

@ricardoloya8177 Жыл бұрын

Great JFET channel N/channel P explanation! Thanks

@mochisol1209 Жыл бұрын

i have an exam soon on transistors and fets, thank you for this!

@CircuitBread Жыл бұрын

Glad we could help!

@sskdll Жыл бұрын

Awesome explanation and animation! 👍

@CircuitBread Жыл бұрын

Glad you liked it!

@moneshrathod Жыл бұрын

Best explanation and animation!

@burakg7246 6 ай бұрын

@CircuitBread many thx for the content. What I don't understand fully yet, is how the current increases with increasing source voltage, although the channel gets narrower.

@ThetrueAccademicweapon Ай бұрын

Well I guess coz V=IR. So R is constant coz its the same material throughout. So V is directly proportional to I. So when the voltage increases the current increases. And current is a rate. you can have the same current flowing through a thick wire and the same current flowing through a very thin wire. Of course if we consider a given time period of less say 100s. More quantity of charge would have to flow through the thick wire and less charge would have to flow through the thin wire to achieve the same current flow. So if you had something like a capacitor ( a device that stores charge ) connected to the two wires. The capacitor would discharge faster for the thick wire than for the thinner wire when trying to mainatin that current. Makes sense ? So yeah as long as a little space is left for electrons to flow though current will increase due to the increasing voltage and still continue to flow. Until that depletion layer becomes large and completely blocks off the current. So in summary voltage increases therefore current increases , but at the same time the depletion layers increase. But at one one point an increase of volateg will no longer cause an increase of current coz the depletion is layer blocks off the current flow. Hope this helps ❤

@W1RMD Жыл бұрын

Thanks for showing!

@jameskidd7906 Жыл бұрын

Electron world in few words and few minutes "bravo"

@ADNANADELRAFI 5 ай бұрын

superb explanation! Thanks a lot!

@mariammohamed7762 7 ай бұрын

Wow....what a super amazing video!!🤩👏

@kiranshyam100 3 ай бұрын

excellent have one doubt sir if we provide negative gate bias what will happen at the output side

@seanxiaofenghu8949 8 ай бұрын

You are my hero!!!

@RixtronixLAB 4 ай бұрын

Nice video, thanks :)

@kosratsalman2712 11 ай бұрын

Well done ❤

@JohnDoeTVChannel 6 ай бұрын

thank you

@igorbondarev5226 6 ай бұрын

If I connect source of N-channel JFET to the ground and drain to +9V and then apply 4.5V to the gate, then is the transistor fully closed because PN junction gate-drain is reverse biased, or is it fully open and burned because of too high forward voltage at PN junction gate-source? I don't understand JFETs

@sorrowin_you 13 күн бұрын

where's part two 😢

@GeoffryGifari Жыл бұрын

are there cases when BJT is preferable over FETs?

@CircuitBread Жыл бұрын

Yep, definitely! BJTs are more popular as amplifiers due to their transconductance and their switching times (which translates into a better frequency response). The interesting thing with engineering is that if there were devices that were better in every way than another device, that second device wouldn't exist. There would be no reason to use it so nobody would make it. But with those devices that we do have at our disposal, it's always a case of trade-offs. Better in some ways, worse in others.

@GeoffryGifari Жыл бұрын

@@CircuitBread tradeoff seems to be a major theme in engineering performance in one way, another way, cost etc

@nomann5244 6 ай бұрын

At 4:18 why deplation region is increased? explanation is not clear

@ThetrueAccademicweapon Ай бұрын

Depletion region region increases coz of the increase in voltage

@jask320 Жыл бұрын

Our instructor should watch this video on how to teach students... 6 minutes instead of a couple of hours of messed up material

@CircuitBread Жыл бұрын

Thanks! We're actually hoping to partner with universities so they can use our videos to explain concepts to students that, like this, are just easier to show in a video with animation than trying to do on a whiteboard. We've been reaching out to some professors we know and, while we're still in the early stages, the feedback is quite encouraging!