Exploring How JFETs (Junction Field-Effect Transistors) Work! - DC to Daylight

#0:00 Welcome to DC to Daylight
#0:50 JFETs
#3:35 Graphs
#10:17 Circuit
#12:53 Breadboard
#14:31 Give Your Feedback

#jfet #transistor #transistors

[xTJ]

I'm happy for this video, it's nice to have a simple explanation of JFETs. I've got a bachelor's and most of a master's in electrical engineering, and have never used JFETs.

The education on them was basically: They're not used that much, don't worry about it for now.

[martinsteele]

Thank you. For people who are setting out on their electronics journey, being able to benefit from experience, explanation of practical considerations and clarity of explanation is invaluable ... and much appreciated. Top work.

[FreejackVesa]

This channel is really the top notch when it comes to exploration of circuit design and theory. One thing that is somewhat frustrating if new to electronics is understanding how to read datasheets and their graphs. Really well explained and useful. Good job

[sgifford]

A bit more complicated than I expected! Excellent channel!

[justovision]

Good stuff. JFETs are still pretty common in audio effect circuits often as a solid state alternative to vacuum tubes. A lot of op-amps have a FET input as well. In both cases they are very easy to destroy with ESD so it's worthwhile having some protection on the gate in your circuit design.

[JenkemFactory]

The internet needed this :) Have been designing a jfet based audio compressor this week, just for shits and giggles, and i really stuggled with tuning in the jfets. This is s very intuitive breakdown. I wish you had uploaded it sooner :, ) Thanks!

[gregf]

This was _very_ informative, but like you say, I can't really remember the last time I had a use for JFET's. Sometime around the late seventies/early eighties.
I _do_ remember building a regenerative receiver using one, which had excellent sensitivity and rejection, but ... that was about it!

[L.Lagrange]

Gonna try to remember to watch this tomorrow. For the moment I only know that they are good as inputs to amplifiers in some situations, and that they can be set up to be nearly ohmic as voltage controlled resistors

[mohammedrezk]

awsome tutorials, i always afraid from the JFETs and think it is not that easy, you make it close to be understood for me, Thx and hope you did some videos or series explaining Op-Amps aswell

[SeanBZA]

Major use is as really low leakage diodes, using that junction, and shorting drain and source together. Will handle up to 30V for most common Jfet devices, though forward current handling is dismal, but for use as a fast low leakage and low capacitance clamp that is not an issue, as you use them in high impedance circuits.

[segfault-berlin]

I would love to see a practial comparison of jfet vs MOSFET, and an example of where each is a better choice in circuit then the other

[mathieusan]

Good video. Would be good to know how to find equivalency, and how to adapt or how to care/expect for one replacement that is not exactly equivalent. The bias likely would have to be recalculated but maybe there's more to care for

[petersage]

6:24 Sauce for the test circuits please? Looks similar to but different from the one at runoffgroove.

[Sloxx]

So what would be the main differences between a JFET and a depletion mode mosfet? They both seem to operate very similarly.

[gangadharana]

Sir what is the voltage between Gate and source shown in your demonstration
Please let me know

[petesapwell]

Never really got to grips with JFETs, found this really interesting. Was surprised at the spread of the parameters, wonder if manufactures bought theirs graded or measured them themselves, you could (I imagine with this spread) fit a new part and find it just didn’t ‘appear’ to work.

[artemdavinci]

How to determine the maximum operating frequency of a JFET?

[walterbrown]

Unlike tetrodes, which use "B+" voltages well above the 5 or 12 volts of solid state devices, the operational characteristics of FETs and tetrodes are similar. ( You fellas who were building, testing and operating such "ancient" circuitry in the 40s and 50s know this stuff )

[jamescollier]

oh, I was just researching this. thanks

[Teddy-Cool]

A decent job. Thanks.
Funny how 90$ books cannot beat a 15 minute video which took, say 15 hours from start to finish.