Diode Logic Gates - OR, NOR, AND, & NAND

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This electronics video tutorial provides a basic introduction into logic gates using diodes, resistors, and LEDs. Examples include OR, NOR, AND, & NAND Diode Logic Gates.
What Is a Diode? • What Is a Diode?
How To Solve Diode Circuit Problems:
• How To Solve Diode Cir...
Clipper Circuits:
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Clamper Circuits:
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Half-Wave Rectifiers:
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Full-Wave Rectifiers:
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Full-Wave Bridge Rectifiers:
• Full Wave Bridge Recti...
220V AC to 12V DC Converter:
• 220V AC to 12V DC Conv...
Capacitor Voltage Booster Circuit:
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Half Wave Voltage Doubler Circuit:
• Voltage Multipliers - ...
Full Wave Voltage Doubler Circuit:
• Full Wave Voltage Doub...
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Voltage Multiplier Circuit:
• Voltage Multiplier Cir...
Light Emitting Diodes:
• LEDs - Light Emitting ...
Power Dissipation In LEDs & Diodes:
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22 май 2020

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Комментарии : 97

@TheOrganicChemistryTutor 5 месяцев назад

Final Exams and Video Playlists: www.video-tutor.net/

@ShonKinsley 4 года назад

He must be genius for sure as he explains as simple and easy as possible with all points to make me understood in logic gates operations.

@luciamonedero1999 4 года назад

i have a circuits exam (referral exam) in June and i just hope The Organic Chemistry Tutor uploads more videos related to OpAmps, Diodes, Transistors and Small Signal, otherwise i'm definitely failing. Thank you so much for all of the videos you upload, you've helped me a lot!!

@karimotoum57 4 года назад

as always thanks for the hard work your putting out.

@sreerekhakp3379 Год назад

Ah thank you so much I've been searching everywhere for a reasonable explanation and finally ended up here.

@shahnawazmustafir4027 2 года назад

Damn!! This is a great explanation. Cleared all my doubts.

@lukwiyastephen5893 2 года назад

Thanks very much for the very simplified explanation,you are a real pro

@yvbuzan7395 3 года назад

After watching this video,I now understand why you 've got almost 3M subscribers.You make things expicit to grasp,which will take me a long time and enormours energy.

@bummerboomerx 8 месяцев назад

2 years past, now he has 7M subs

@buckwheat_flower 3 года назад

Brilliant explanation for this topic! ★★★★★

@sanskritachakraborty7484 Год назад

Amazing video and very clear and detailed explanations. Thank you sir.

@dhadumia Год назад

Awesome job!

@ralphacosta4726 Год назад

Wow! That sure wore my brain out trying to develop each circuit BEFORE you showed and explained the right circuit. I still haven't developed the intuitive understanding, but this certainly helped me better see the current flow and voltage differences. I've gone through your videos on circuit analysis and those helped me follow your explanations after the fact. My wife walked in while i was looking at the video and she (Masters in Adult Education) exclaimed "Now THAT'S the right way to teach!", being impressed with the clarity of how you had laid things out. Congratulations and thanks. I had to keep re-watching parts to fully understand, but definitely worth the time. I've watched videos which clearly explained how to use logic gates with switches (esp. ElectroBoom), but this is the first showing how the logic gates themselves can be built.

@TheBustyOnion 4 месяца назад

Awesome video, also thank you for doing it with 5V and LEDs making it easy to test out a breadboard with an arduino. Great learning

@bhavesh.adhikari Год назад

Cant thank enough! RESPECT ++

@adrianobueno6984 3 года назад

Really great presentation, thanks!

@pratiknaikpratik9634 2 года назад

mum me lee

@MathemaTeach 4 года назад

Nice. Very comprehensive. The picture helped a lot so the concept is more visual than being abstact. Thanks.

@prekasu 8 месяцев назад

thanks a lot bro!!

@BMWAD Год назад

yes we have exam tomorrow 😂

@sakibahamed3705 3 года назад

Thanks a lot. ❤️

@atambaasiimwe9618 2 года назад

This guy knows I'm his biggest fan

@vedantsinha7374 2 года назад

Thank you!

@roshandev8604 4 года назад

It's awesome

@ProfKengne 4 года назад

Which software did you use? I whan to make the same

@MaxTornado61 Год назад

Great videos. You explain very well. Are you going to add videos on FETs and more? Thank you

@KentBuchla 3 года назад

I’m curious as to how these circuits can be used to derive a +5V trigger or gate signal for use with a modular synth circuit. Where would one tap the signal in order to get a healthy +5V based upon the resulting truth tables? I’m especially interested in the AND circuit. I built one with 2 NPN xstrs but the resulting output is useless. Building it with diodes and a 5 volt rail seems like a good time.

@cutecattydaily Год назад

Thank u sooo much...

@user-cf7wm2sz2j 2 месяца назад

Super explanation 🎉sir

@sktech2001 7 месяцев назад

good explanation gates

@mwansachikonde4193 2 года назад

Wow, this is amazing. Do you have one for Transistor Logic Gates?

@marinulalam Год назад

you are damn genius !!

@rufussewel4553 3 года назад

the best teacher in the world... he teaches in very easier way...

@ELBMamtasingh 2 года назад

Great

@amrsayed6677 3 года назад

A very important question here: How can we make each of the two circuits output ... or in other words, how can I connect these logic circuits to be used in a specific logical operation

@Humble-XO 3 года назад

Don't know if you will see this or not, but have you ever considered being a private tutor? I would pay good money for you to teach me this subject (electrical circuits and engineering). Though your videos are very helpful, I still get confused and i'd love to be able to ask you questions in real time.

@namankohli4748 3 месяца назад

Hey, thanks a lot for the video, it really helped me for my exam.. just a small doubt, in the NAND gate if we choose R3 such that the voltage drop is enough for the LED(>=2V), will current flow through both R1 and R2 or just R2?

@rationalthinker9612 2 года назад

What about all of the other logic gates such as XOR, negative-OR, negative-AND, negative-XOR, etc...Also on the AND-gate towards the end, you said the potential at the point right before the LED was 3.5-V, how is that possible? If the potential is 5-V at A or B and the Diodes drop 0.7-V across each of them , that leaves 4.3-V. Since 4.3 > 3.5, shouldn't that be the potential at that point?

@iquniq392 Месяц назад

Bravoo

@isatahawakamara2072 3 года назад

It's only God that will bless you Thanks so much

@hibmoshar6206 6 месяцев назад

Thaaaanks

@beachwave5705 11 месяцев назад

the first time ive left from a toct video without understanding anything :/

@jaretw4293 4 года назад

👏👏👏

@tn5630 Год назад

17:00 why does the current flow through the R2 and the led instead of the path with R1?

@aviandragon1390 10 месяцев назад

It will flow through both paths.

@skidroww1969 4 года назад

(1) At 6:17, there is electrical potential of 4.3 V after diode and 3.0 V after the LED. Why is electrical potential set at 4.3 V and not 3.0 V at this location? Why is the larger chosen? (2) At 5:27, what is purpose of diodes in OR gate? It seems the circuit would work without them and they are redundant.

@rithikradhan367 3 года назад

For 2) in actuality the values 0s and 1s will not correspond to 0 and 5v We need some device which will restrict current at a some voltage and diode does this, If A had a greater potential than at other side , the diode will be reverse biased and offer high resistance and no current flows, but a conductor wld allow current in the other direction Also, current can pass through conductors even though there is no potential difference...

@chrisp1582 2 года назад

1. The voltage drop across the diode (.7v) is less than that of the LED (2v) so it will take the least resistive path to ground (no potential). In other words, the diode only resists .7v leaving the following point at 4.3v, rather than the led resisting 2v and leaving you with 3v at the following point. The greater potential is from 4.3v to 0v so the larger is chosen. 2. The purpose of the diodes is to act as a switch in the circuit. If voltage is applied at either A or B then the LED would be OFF due to the greater potential across the diode. Similar to answer 1, the diode resists less which allows a greater potential and an easier path of resistance.

@vedprakashmishra551 2 года назад

Diodes connected in parallel would act like which gate??? Kindly explain me.

@PeetHobby Год назад

5:30 That NOR example isn't a real gate, hasn't a real output that you can use, I wish it work like that, but you need a transistor to invert OR diode gate into a real NOR gate with output a signal.

@caizhengyu 4 месяца назад

Whats the purpose of those resistors

@calmdownsis 4 года назад

It's been wonderfully taught that even a moron can get it so easily...

@ianchan2624 4 года назад

It's been wonderfully taught that even a moron can get it so easily...

@jonnyboy2000 3 года назад

@Killer Boy It's been wonderfully taught that even a moron can get it so easily...

@jaysonabayan3279 3 года назад

jesus, im worse than a moron

@successthruknowledge 2 месяца назад

I think that earlier in the video he meant to say "at least" with respect to the other examples with 0.7 Volts as well. I'm guessing that these aren't the only circuit constructions with represent these truth tables?

@TeacherMel 4 года назад

talented

@Ta3iapxHs 3 года назад

At 6:17, there is electrical potential of 4.3 V after diode and 3.0 V after the LED. Why is electrical potential set at 4.3 V and not 3.0 V at this location? Why is the larger chosen?

@buckwheat_flower 3 года назад

The larger value takes dominance at one certain point at a time

@chrisp1582 2 года назад

The voltage drop across the diode (.7v) is less than that of the LED (2v) so it will take the least resistive path to ground (no potential). In other words, the diode only resists .7v leaving the following point at 4.3v, rather than the led resisting 2v and leaving you with 3v at the following point. The greater potential is from 4.3v to 0v so the larger is chosen.

@typedeaf 11 месяцев назад

@@chrisp1582 But will any current actually flow through the LED? I need to set this up on a breadboard and do measurementts. You are saying the general rule is this?: When two or more paths connet to a common node, the voltage from that node will be that of the highest voltage source.

@chrisp1582 11 месяцев назад

@@typedeaf Yes, current will flow through the led. This is simply the measurement at the connecting node which would be that of the least resistive path. The voltage at the node will be that of the greatest potential to ground which can change based on the volume of voltage from the source. So if you increased the voltage source from another point that value could change at that connecting node.

@rachaeladdo5302 4 года назад

🙏❤️

@pratiknaikpratik9634 2 года назад

who r u

@ukpauchechi Год назад

please i have a question, for the And gate why can't current flow from the 5v to led?

@fastbike9845 Год назад

Diode blocks it

@hitajuneja 3 года назад

OR - 0:11 NOR - 3:40 AND - 8:30 NAND - 14:43

@gamingclips1901 3 года назад

Need Digital Elctronics please

@martin22336 4 года назад

Please do biochem videos.

@user-td3uj8is5i 4 года назад

I use these in Minecraft alot.

@songs-nq4my 5 месяцев назад

I was able to design the 7 logic gates using only diodes, without any transistors

@katkossen4173 4 года назад

what makes it 4.3 v aorund 8:32

@SoumyaMehtalove 4 года назад

the germanium diode has a voltage of 0.7 v for working, so after passage of 5v, only 4.3 v leaves the diode. edit- i meant SILICON DIODE*

@AchiragChiragg 3 года назад

@@SoumyaMehtalove *silicon. Germanium has a Voltage drop of 0.3V

@SoumyaMehtalove 3 года назад

@@AchiragChiragg thank you, cannot believe i made such a blunder and no one else pointed it out.

@typedeaf 11 месяцев назад

@ 10:00 How are A and B considered as inputs of the AND gate with the diode blocking them? A and B would have to be a switch where the NC is to ground and the NO is to 5v? That seems like a big assumption to not have mentioned. The typical circuit would have A and B as a switch with NC being an open circuit. Also, the only reason the current follows D1 or D2 when they are 0v is because it has less resistance than the LED and second resistor, right? You never state the resitance of the diodes and LED. I am asking this because if you dont consider that fact, and instead first calculate the voltage drop across R1 as if it would next follow the LED, it would only drop 1.5v, which would be enough to power the LED.

@aviandragon1390 10 месяцев назад

This is a 5V logic circuit. All inputs are assumed to be either +5V or 0V (ground). Open circuits are undefined in logic circuitry. They should never occur because they can cause errors. Secondly, no. The input diodes have a biasing voltage drop of 0.7V, and we are assuming they are connected directly to ground. This means the voltage at "point C" (as he labeled it later in the NAND circuit) will be pulled down to 0.7 volts. That is not enough to turn on the LED. Voltage drops across resistors do not remain static when the circuit condition changes. When point C becomes 0.7V, the voltage drop across R1 (top resistor) will necessarily become 4.3 volts. If there was a fault in this video, it was the fact that this was not explained clearly.

@vinceb7918 Год назад

Where is the OUTPUT node of these gates? With respect to inputs A and B, there must be an usable Output pin to drive, e.g., the base of a transistor.

@aviandragon1390 10 месяцев назад

The output is where the LED is. Remember that this is diode logic. It has long been extinct in logic circuit design. Transistors had not been invented yet when this was still being used.

@sansok7827 2 года назад

why google say there are only two types of diode logic ? one is diode logic OR gate and diode logic AND gate .

@technicalhubbo884 2 года назад

That maybe because the nand nor xor and xnor logic gates are dervied from those and are not specific

@okc9507 4 года назад

face reveal at 2 million subs???

@user-td3uj8is5i 4 года назад

What about EXOR and EXNOR?

@gracel7475 4 года назад

Those dialike must be from our teachers

@scottbousfield7879 7 месяцев назад

Well explained - but my man.. TH and F do not carry the same sound Both is not pronounced BOF

@enosdirk6542 4 года назад

I thought LEDs needed 12-20mA to light up

@jason-pr2oe 2 месяца назад

have an hour for exam😂

@1994gurjit 3 года назад

My professor has easier explanation of NAND gate Dr punit bajπ ( HOD physics dept)

@KentBuchla 3 года назад

Link to his video. Oh, he doesn’t have one?

@mohammadtahir2611 Год назад

This is class 12 syllabus in India

@amanjotkaur9863 2 года назад

Understand nothing

@denniswilson631 2 года назад

Stick to chemistry; your teaching technique for logic functions is worse than poor; it is wrong. By changing how the LED is connected to the input diodes, you are flipping back and forth between active-high and active-low logic conventions without a word of explanation. On and Off have no place in a truth table, which is why 50% of your tables are semantically correct, but logically wrong. If you instead assign 1's and 0' to the outputs, you will see that the NOR and NAND tables are wrong. The problem is the schematics. The schematic for a particular type of gate is what it is, with no regard for what is connected to the output. Your truth tables depend on changing output connections, whereas correct ones do not.