Digital Electronics -- DeMorgan's Theorem

This video will discuss DeMorgan's Theorem. I will cover the following topics:
Use DeMorgan's Theorem to solve equations
Use DeMorgan's Theorem to break lines
FOIL - First Outer Inner Last
Bubble Push
Please leave a comment and 'like' the video if it was helpful.

[@ognimoddd]

You explained in about 16 minutes what took my professor an hour and a half. Thank you!!

[@MovieHQ]

You are welcome. Glad to help.

[@davidhe7935]

understood the concept in seconds, just break the line and change the sign! Thank you, very helpful and saved a lot of time!

[@MovieHQ]

You are welcome

[@MrJosh6889]

This is a lot better than a stale computer organization text book. Thanks for putting this out.

[@MovieHQ]

+MrJosh6889 Thank you very much!

[@mohammedsayed4793]

when i dont understand something in class i just come to your videos and it all becomes clear, my professor is horrible, thank you!

[@ghost93700]

Sir, I can't thank you enough for these tutorials..I'm saving a lot of time using these and all thanks to you!... Please upload more videos in the future.. You're the KZbin's official Digital Electronics Professor who saved students and time.... 1hour=15minutesof your class.....WOWWWW!!. Love you Thanks

[@MovieHQ]

Thank you very much. I really appreciate you kind words.

[@robdouma6382]

You are VERY good at teaching....made it so clear. Thank you!

[@MovieHQ]

Thanks! I really appreciate it.

[@TheSaady20]

I'm an electronic engineer and i thank god that you made these videos!

[@MovieHQ]

+Saad Ahmedsw Very glad to help. Thanks for watching.

[@andrewclark3162]

i learnt more in this 15 min video than 3 hours of lecture

[@MovieHQ]

Andrew Clark Thank you very much!

[@Paraclete333]

DeMorgan's theorem in a nutshell: BREAK A LINE, CHANGE THE SIGN (I love the way it rhymes!) It took my professor over a month to teach this.

[@harshpherwani6590]

Lmao I feel ya

[@james77011]

I heard about De Morgan's Theorem many years ago but, it was so confusing... Gave me a headache trying to understand it 🤦

[@chocobo1]

A few months ago I remember struggling with truth tables and I found your video which helped me. Now a few months later I youtube "DeMorgans theorem" and your video comes up. Once again you have saved my school life, thank you so much dude.

[@MovieHQ]

So glad to hear they helped. Thanks for watching!

[@GarrettMorrisey]

Thank you so much for these videos! I have NOTHING AGAINST FOREIGN PEOPLE, but I have a foreign teacher and it is sometimes harder to catch things or understand due to an accent. Your videos clear this up for me.Thank you.

[@MovieHQ]

Thank you for watching!

[@TheElz8]

You Sir are a Prince!, I have struggled for years to remember DeMorgan's Theorem. It seems like child's play now..thank you!

[@MovieHQ]

Glad to be of help. Now if I can get my wife to agree with you!!

[@TomOtero1984]

These videos are great! Break the line change the sign. Little phrases like that are what stick when you need to remember on a test!

[@MovieHQ]

Thanks. That is what I was taught and pass it along.

[@androiduberalles]

Excellent. This was 15 minute video was way more helpful than the 1.5hr lecture my professor did. Thanks.

[@MovieHQ]

Thanks!. Comments like these keep me going.

[@Exoorb]

Honestly, Your videos are amazing. I have learnt so much more watching these videos then I have in lectures. You explain things exceptionally well, you keep it clear, concise, to the point and always provide easy ways to remember things. Thank you so very much!

[@MovieHQ]

Thank you. Makes it worth doing.

[@prestongovender6128]

Amazing tutorials on all these videos. Been binge watching them after being totally clueless trying to understand my textbook. Thank you!

[@MovieHQ]

+Preston Govender Thanks. Glad I could help.

[@kirin347]

"When you break a line, you change a sign." Love it!

[@MovieHQ]

+kirin347 Old school. There should be a rap song!! :)

[@jaiankrishna1462]

kirin347 i

[@kmatera1]

unbelievable, huge help! thank you for not speaking robot!!!! "break the line, change the sign." genius

[@MovieHQ]

Thanks!

[@kimmany1999]

Thank you so much for your videos. Your explanations are clear and concise and very easy to follow. You have helped me immensely.

[@michaelangelodino9775]

thank you sir. now i can answer my test tomorrow :) God bless you ^^

[@nguyen1314]

you are so hlepful ive watch all your digital class it really good keep up the work ! i like how you give us examples and let us do it. THANKS AGAIN!

[@JakobRobert00]

0:50 "When you break the line, you change the sign." Did you make this rhyme on purpose? It is a really good way to memorise it.

[@MovieHQ]

It was taught to me when I took digital. Not sure where it originated from.

[@belhdawa]

Oh now i will not forget this sentence Thanks XD

[@jerredblunt1112]

Simply awesome. True sign of intelligence is making hard stuff easy to learn. Very well done!

[@MovieHQ]

Jerred Blunt Thank you very much!!

[@clarksarge4750]

This is a great explanation of digital logic.

[@MovieHQ]

Thanks!!

[@innocentkabaso6727]

You are an impossible Lecturer,I don't attend Lectures but i have made it Sir;thanks a lot.

[@karenartiom]

I wish my teacher could explain like you. Thank you very much

[@MovieHQ]

Thanks. I appriciate it!

[@chingizmizambekov6078]

Thanx a lot :) much more explanatory than our course book :)

[@MovieHQ]

+Chingiz Mizambekov Thank you!

[@mandochali5343]

This is really helpful. keep it up, God Bless You.

[@metaphyzxx]

This was explained so much more functionally than my teacher did it!

[@MovieHQ]

Thank you. I appreciate it.

[@instaminox]

Simple and straight forward! best wishes :)

[@MovieHQ]

Thanks!!

[@dacintra5110]

all your videos are superb! Very helpful.

[@MovieHQ]

+Omran Basma Thank you very much!

[@sparshgupta3827]

man wow... i got it all in one go!

[@shadentalal7117]

THAAAANK YOU SO MUCHH!!! God bless u

[@ronaldrupard5443]

I understand how the bubble pushing works schematically, but I am still a little lost on the significance of this. I understand in the one example how you were able to "demorganize" the two and gates and 1 or gate into 3 nand gates. This made sense. But almost every other example you have just as many types of gates as you start with, so is there really no significance here, just learning the innerworkings of bubble pushing? Thanks! the videos are awesome.

[@Owl90]

my dude! You helped me so much! Thanks a lot for these videos!

[@MovieHQ]

You are welcome. Glad they helped.

[@dorrkboy]

This video really helped me, i was making this far to complex ... thanks!

[@MovieHQ]

Glad I could help!!

[@dabreadman6567]

Man you videos are a God send!

[@MovieHQ]

Thanks!

[@dabreadman6567]

You're welcome, Don't stop what you're doing!

[@BluEBomBeR41]

Thank you! I love how you explain things.

[@MovieHQ]

Thanks!!!

[@micaman13]

Loving these videos. Do you think you could do a sop to pos practice problem using De Morgan's Theorem? My professor has done it once or twice but went to fast for me to get what he was doing. I would love to see how you would teach it.

[@MovieHQ]

Can you give me more detail! Do you mean to take a sop with most if not all inverted then break lines or sop with lines already broken and convert to pos by combining lines. Give me an example and I will see what I can do.

[@1lumpen]

I'm still having trouble, but you do a good job. I understand a little bit better, and I did okay on your questions, but then the truth table lost me again.

[@1lumpen]

Also, on the bubble pushing. When you have two different initial input gates, how do you determine what kind of gate the third gate becomes??? I don't see anything intuitive in the answers given.

[@MovieHQ]

Steve Matz It really depends on the goal of the outcome. If you are converting to all NAND gates, then you would convert the ORs to NAND and convert whatever others you must to create NANDS. I was mostly just showing you how to do it, not to really have a purpose.

[@sunimalsenaratne3180]

Thank you so much for great tutorials

[@MovieHQ]

You are welcome!

[@seandon3827]

if I do good on my exam its because of you :)

[@MovieHQ]

Glad to help.

[@konev13thebeast]

how does this video only have 8 likes? Its awesome

[@MovieHQ]

Thanks for the kind words. I really do appriciate them.

[@victoryoyah6600]

like your lectures....now which is the most preffered method to use in simplifying logic equations?

[@MovieHQ]

Really it depends. I use k-maps for most things. It is just quicker. If there are small expressions that are basic, I will use Boolean algebra.

[@333shiraz]

sooo awesome teaching thanks man i wish i could give 1000 likes!!!!!

[@MovieHQ]

Great to know it helped.

[@ramyapriya7824]

GOOD WORK PLS UPLOAD MORE VIDEOS AND THANK YOU

[@MovieHQ]

Thanks!

[@RustedNation]

Thank you sir for the knowledge!

[@MovieHQ]

You are welcome!

[@ishezthephenom6482]

You guys fantastic...keep up

[@MovieHQ]

Thanks!

[@LostInLeiden]

Really good video, thanks a lot!

[@MovieHQ]

Thanks for watching.

[@MovieHQ]

Thanks. Glad to help.

[@MrDivad006]

Great video! What is your profession if I may ask?

[@MovieHQ]

Lowinator Thank you. I am a professor and assistant dean at a college.

[@T1000315]

MovieHQ You are currently saving my life on my DE final tomorrow. I hope there is some way I can repay you. Also, where do you teach? I wish the guys teaching me posted gaming videos in their spare time haha.

[@MovieHQ]

T1000315 Glad I could help you out. I am located in Lexington Kentucky. I agree, not many teachers play games in their spare time and post them. I wish I had more time to play/post. I do what I can.

[@MovieHQ]

+razorIaIa I use these as my lecture videos as well. I am sure I have students who feel the same way about me. :)

[@MovieHQ]

Great! Glad it helped.

[@DanDaddyD]

this is gold

[@MovieHQ]

Thanks!

[@shutdahellup69420]

15:31 in question no.02 how did the NAND gate after bubble pushing became OR gate? can u please explain??

[@MovieHQ]

When bubble pushing, you change the gate, add bubble where there were none and remove bubbles that were there. NAND becomes OR with output bubble removed and input bubbles added. The input bubbles then "float" back to the outputs of the other 2 gates.

[@shutdahellup69420]

MovieHQ oh!!! thanks a lot for quick reply... love these videos...keep up the good work.

[@solomonthell7589]

Why didn't you change the sign between (B+C) When you broke the line? 3:46

[@MovieHQ]

I did not break a line for that one. A and B+C both had 2 lines over them. When you have 2 lines, they cancel each other out. If you broke lines, you would have to break 2 lines and change the sign twice (going back to waht you had in the first place).

[@solomonthell7589]

Ok ic now...Thanks man God bless u.

[@RealLoveDragon]

Thanks king!👑

[@Mental1993]

You are awesome! thank you!

[@MovieHQ]

Thank you.

[@MovieHQ]

Thank you!

[@DC_Gaming2447]

I know you said you can break a line but can you reconnect it while changing the gate again? like saying: A(not) * B(not) is the same as (not) A+B?

[@MovieHQ]

+John Cobb Yes. Connect a line and change the sign.. Same thing in reverse.

[@DC_Gaming2447]

+MovieHQ what if you run into a 1+A(not) or a 1*A(not)

[@MovieHQ]

+John Cobb Anythings ORed with a 1 is a 1... Anything ANDed with a 1 is just the thing (A(not)).

[@GD-jx1sb]

Starting at the six minute mark, the third and fourth examples are wrong. Why is there no sign change or complement for B + C? Shouldn't the final answer be A + B'C'? Same with the fourth example why are you not changing the AND operator to an OR operator for A'C'?

[@MovieHQ]

These are both correct. For #3: B+C has 2 lines over them. If you were to break those 2 lines, you would need to change the sign 2 times. Or just cancel the 2 lines (since they are the same length. Same for #4.

[@zishy92]

how would you use de morgans law on this expression !C(AB+!A!BD+!AB!D) != this means it has a single line above please help

[@Adeo83jcso]

cs made simple hats off^^^

[@ohmakademi]

good lesson. Thank you so much

[@MovieHQ]

+DİJİTAL ELEKTRONİK Thank you for watching and the comment!

[@ohmakademi]

thanks

[@chummyigbo8844]

You very good. Thank you

[@MovieHQ]

Thanks for watching!

[@brokenangel2513]

very good

[@MovieHQ]

Thanks!

[@12131ize]

I LOVE YOU MAN !!!

[@MovieHQ]

Thanks!! I think!! :)

[@Jinz007]

This helped a lot...

[@MovieHQ]

Thank you!

[@Lone1025]

You're awesome!

[@MovieHQ]

Thanks!

[@americanclicker516]

I have seen your videos and they are perfect.In fact i use bulean algebra in school and except that i also use other things that you unfortunately didnt have like for ex The diamond code,huffman code,hamming,bistables etc :/ can you help me with a good channel that has these?

[@MovieHQ]

American Clicker Unfortunately, I do not know of any other videos that cover those. I am sure there are some out there. Those are items we do not cover as part of or basic digital class.

[@johnlang555]

at 9:17 wouldn't you have been left with just BC(A+1), how did you cancel the 3 A's ?

[@MovieHQ]

+Maximilian Ortiz Remember the rule of ORs. Anything ORed with a 1 is a 1. Does not matter how many terms or what the terms are.

[@johnlang555]

Oh ok so if it is A + 1 or B + 1 it will always result to 1. Now how about if it was A + B + 1 will the result also be 1?

[@MovieHQ]

+Maximilian Ortiz Those will always result in a 1.

[@johnlang555]

MovieHQ thanks for your help

[@james77011]

At time 3:50 I thought the sign below B+C should have been changed to B•C Or did i miss something? 🤔

[@MovieHQ]

There are 2 lines that are both the same length so they cancel out. If you changed the sign, you would need to change it twice since there are 2 line taking you back to +

[@TacoDaddy-mr8ig]

Im watching your video again. I have also been watching another video and reading a book that has some rules about what you showed at time 3:50 i jus want to make sure the rules in the book applies to your video as well. I will take pictures and send to you for more clarification ​@@MovieHQ

[@MovieHQ]

@@TacoDaddy-mr8ig Those rules all still apply to Boolean algebra so they should apply to your book. It might be written differently. I have tried to make it as simple as possible.

[@BlackopsUSN]

I am confused when the problems get larger I can do the simple ones but my teachers makes this hard very hard to understand I need help with it maybe I am not smart enough to get these things

[@MovieHQ]

Just take them line by line and and don't try to break too many things at once. Start with the lines closest to the terms (under other lines) and work up breaking one line and changing the sign at a time. You will get there.

[@kapilkumaroctober]

Why can't we break the line and change the sign to plus for the 4th example where you have ________ ______ ? AC

[@MovieHQ]

+Kapil Kumar If you are talking about the 4th one on the list at around 5:07, you could break the line and change to + however, there are 2 lines. You would need to then break the second solid line therefore changing it back to *. Remember that lines of the same length (covering the same items) just cancel out. Hope that helps and thanks for watching.

[@brendajahongo942]

you really are a good teachercan you please show me how to draw a logic gate using one gate onlyI always get that question wrong

[@MovieHQ]

+Brenda Jahongo Thank you. I cannot post another video, but I can give you some tips. First step is to bubble push the gates until you have the type you need (OR or AND). Then keep in mind that a NAND or NOR gate with the inputs tied together acts as a NOT gate. That should get you through pretty much anything.

[@brendajahongo942]

+MovieHQ that's bad ,your videos are really good ...thanks for the tips , I think I am getting something.But I have one more question on 2's complement..Have do I solve this: -(05.50)decimal -(15.25)decimal?

[@MovieHQ]

+Brenda Jahongo I am not sure what you mean. 2's compliment would be for Binary numbers not decimal.

[@brendajahongo942]

+MovieHQ but i just got a question like...

[@MovieHQ]

+Brenda Jahongo Sorry I could not be of more help. Maybe you need to convert to Binary first then do 2's compliment? I have no idea.

[@wanyoikedanny472]

thanks

[@MovieHQ]

You are welcome.

[@brokenangel2513]

شكرا ممتاز شرح

[@maxduncan7090]

lifesaver

[@MovieHQ]

Thanks!

[@NebulaWorm]

oh ini dosen mekatron gue

[@MrSarimjavaid]

Thaaankkkk Youuuu

[@MovieHQ]

+Sarim Javaid welcome

[@kaadshah7737]

sorry but i really understood nything after 12.02dat concept of bubble pushing would plz explain me ...:( for the very first time it happened that i couldnt understand ur explainatioin..i felt bleak

[@MovieHQ]

kaad shah Bubble pushing is using logic diagrams to perform DeMorgan's Theorem. Probably not something you will see too often honestly. Not sure I could explain it any better in text than I did in the video.

[@kaadshah7737]

MovieHQ yess finally got d point

[@98xcxc]

?Can I get your power point

[@MovieHQ]

I am sorry, but I do not have them any more.

[@sluttyfuck19]

I like

[@MovieHQ]

Thanks!

[@prinxegupta]

You can be a real teacher man. But just one complaint I have from you. Please focus a little bit more on fundamentals and working of things. You are a wonderful teacher but the main issue with our education sytem is that we learn things but never understand how things work. You can work on that and be a wonderful and great teacher. Please pls don't only focus on the concept. Focus on the fundamentals as well.

[@MovieHQ]

+Prince Gupta This whole series is not designed for engineering level students. It is more for the technician level whop does not really need to know every detail of the whys. They just need the hows. I appreciate the comment about being a teacher. I have been a college professor for almost 20 years. :) This is the method that works best for the students I teach in the technical college.

[@harshpherwani6590]

you're doing a wonderful job, keep up the good work thank you for helping us all

[@MovieHQ]

Thanks!!

[@harshpherwani6590]

you deserve it :)

[@3333218]

(8:20) You lost your chance to do an ACDC joke.

[@MovieHQ]

Yes, there are a lot of those in digital.

[@rakeshkumarray1016]

very nice

[@MovieHQ]

+Rakesh Kumar Ray Thanks!