Electronics 101: Diodes
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- Опубліковано 22 кві 2012
- In today's Electronics 101 lecture, we start talking about semiconducting analog components. Today's component is the diode, and its family memebers, the LED, schottky, and zener.
The next video is supposed to be a viewer requested video so if you have a question, put it in the comments below. - Наука та технологія
I love you man, you made my life in electronics much easier to understand, keep up the great work.
In my experience, zener diodes in power supplies are meant to act as a means of protection against power surges.
Simple to follow the & informative. Thanks.
Thanks a million for your awesome and great way :)
im talking my courses in turkish which is very hard to understand , but here Iam .. I can understand everything perfectly now because of your videos .. Thanks again :)
I enjoyed the lesson you presented, and I decided to subscribe, hoping that you have the same style in your other lessons. Thank you =D
Easy to follow, thanks for the vid!! Quick question about zener diodes. What's their relation to transistors in a power supply circuit? Would they help control how much voltage can pass?
you are a great person
Thank you very much for shering.
This is awesome! thank you so much for doing this!
(Maybe give out some homework on each subject to also use the Learn by doing aspect of electronics)
How do you read a diode? And how do you know how much Volt and Amps of the diode you need to use? What i mean is that i have a solar panel that produce 25 watts, 1.33 Amps, and 18.8 volts and i want to know what the diode voltage and ampage amount do i use?
what color would the multiplier band on the 44 ohm resistor be, black?
In a zener diode does the zener voltage equal the forward voltage.
The Vf value is just a guess. It might be somewhere in the datasheet, but I go by what my simulator gives me. The Vf comes from how the device is built.
why haven't you mentioned that conventional current flow is different from actual current flow, this is important.
It's Falstad's Circuit simulator. It should be the first result in Google if you search for it.
Technically no. There are some complex formulas that will give the actual current through the diode at given voltages. But for simplicity's sake, if you're going to be operating the diode well above the forward voltage, then the resistance is really, really, really, close to 0.
That was great! Glad I found you!
Question: What's the name of the Electronic Simulation software you use? Looks impressive! Thx.
thank you
OK, but I have watched other you tubes that say that when the cathoide is attached to a negative terminal, the diode is forward biased and electrons flow from the p material of the cathode towards the depletion junction. This means current is flowing from cathoide TO anode. When the cathode ius attached to a positive terminal, the diode is reverse biased and no current flows. I am now left confused by your explanation of the current flowing FROM THE ANODE to the cathode. I would appreciate your clearing this up. Thank you.
Sort of. They're analogous to two diodes placed relative to one another in a specific manner. In an NPN, the transistor can be thought of as two diodes biased away from the base, and in a PNP, the diodes are biased towards the base.
Which simulator are you using?
I'm not quite sure what you mean? To create a common ground, 0 volts, all grounds are just tied together.
at 8:38 when talking about current flow direction. Do you mean conventional current flow or neutron flow?
clinton Raubenheimer You are overthinking it. I don't know why books make such a confusing fuss about the two different "theories" of current flow. Ignoring back EMF or your armchair physicists pet theories, current only flows in one direction. An excess of charge (free electrons in the standard model) builds up pressure and wants to disperse. In a circuit those electrons disperse across the circuit to the low pressure location known as "negative".
He did not even specify "+" or "-" so there really should be no confusion. If he says current is flowing "------>" (l to r), he means "electrons start here ----------> flow to here"
conventional
+ ----> - (electrons start here -----> flow to here)
electron flow
- -----> + (electrons still start here -------> still flow to here)
It is a really stupid distinction based on the semantics of how you describe what is occuring.
Ben Franklin (who invented "conventional flow") RIGHTLY assumed that charge accumulated and disbursed from a location of POSITIVE electrical pressure to a location of NEGATIVE electrical pressure.
Some jack asses who thought they were extra clever decided that this was "wrong" because "electrons" are "negative". Besides the fact that assigning a "negative" charge to electrons is arbitrary itself, it seems to have made a pointless mess of things for no good reason. There is nothing inherently wrong with thinking about electricity in conventional flow terms. It is analytically sound. It is, imho, actually more baseless to use electron flow, because electrons aren't really "negative" anyway.
Your the only person in the world that I your dots.
hole chaser or electron chaser?
Can you do a lecture about inductors please? I really, really need it..
Allen Allada check out Afrotechmods, he has a lot of electronic tutorials, you can also check out GREAT SCOTT
Hi,
Can you clarify how one creates commom or ground point on a digital implementation? Can you also clarify tge same but for an ac implementation? Thank you.
:-)
where would a Zener diode be used?
Justin O'Donnell Maybe in an AC circuit?
Voltage regulators