Making Logic Gates From Discrete Components - The Learning Circuit
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- เผยแพร่เมื่อ 30 พ.ค. 2024
- In the previous lesson, Karen explained the logic behind AND, NAND, OR, NOR, NOT, XOR, and XNOR logic gates. In that episode, we also learned that logic gates are typically contained in IC chips, with multiple gates within each chip. For this episode’s project, Karen has decided to throw out the ICs, and instead, use transistors to create each logic gate, further demonstrating how the logic of each gate type works. Follow along to continue the journey of understanding logic gates through the use of transistors. Solder along and you’ll end up with a tidy little project contained within a couple of Altoid tins! In the end, Karen dares you to try your hand at creating the more complicated XOR and XNOR gates out of transistors. Are you up to the challenge? bit.ly/2LBApO7
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I needed an XOR gate on a project I'm working on. I built it from 4 NAND gates and it worked perfectly. Imagine how disappointed I was when I modified the circuit and no longer needed the XOR in it LOL
Welcome to electronic circuits xD Have fun redesigning things thousands times lol
Still.. you must have felt good to have been able to redesign it to.
I'm glad you are making these beginner videos!
So am i👍👍👍
0:49, what is the 4.9KOhm resistor for?
Really love this series.
Thank you for doing this! It is a very important bridge of knowledge between physics/electronics and logic. Fundamental to any serious understanding of how electric technology works.
This is a great video. For the nand gate example, I'm wondering whats stopping the current at the top from flowing to the LED when both switches are closed?
I understand that current is able to flow into the Q1 collector and so forth, but doesn't the electricity also still have a path to the LED?
Videos like this are a gem. You explained this perfectly, so thank you. So much time wasted elsewhere cuz we no longer have the aid of searching TH-cam and utilizing the dislike tally.
Nice presentation and planning out of the project Karen
I'd always wondered how logic worked in physical circuitry, the video was really informative! :)
This 's what I 'm looking for (how to apply transistor instead of NAND gate & OR gate IC). Thank you teacher.
Im really loving this series :)
Very educative video I really love it
wait why wouldn't the current still flow through the LED for the NAND gate?
Great video, thanks!
Never seen this channel before it looks good 👍☝☝
Excellent, I was finding this type of video about a year to make water level indicator with 7 segment display because I don't want to use microcontroller like Arduino because it has low resolution, and I wanted to get high resolution level indicting like percentage, thanks a lot
I get most of it but confused on the diagram vs the schemtatics and didnt see where you mentioned the switch(not the 2 buttons) on the main board. The diagrams 5:00 arent clear on what connects to what.
Very good info
Thanks, Karen!
Are new TTL 7400 series logic chips available. I am new to electronics, and am looking to start getting somes chips to start practicing some projects. Thank You
What is the reason for 4.7k resistor?
Thank you for this video maam
Good basics.
This is funn and visual way of learning see it in practise etc :D
Can someone explain what is the function of R5 in the nand gate???
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thank you very much👏👏👏👍
I`m so confused. In the AND gate circuit You are using NPN transistor but on the collector and on the emitter there is positive charge?!
Is the base resistor supposed to be 10kΩ regardless of which NPN transistor i use? If not, how do I calculate that value?
You calculate that value by taking the collector current and dividing it by the max gain. This gives you base current which you then can use to get the resistor value since the voltage is known.
@@max3d_0ut Thank you for your reply Max, still hadn't' figured that one out so it was still relevant :)
@@emilberg7959 no problem. Just starting into electronics myself and I had the same question. Actually had to watch another video on transistors by Great Scott
very helpful
Is there a reason the 4.7k is parallel to the LED?
I've been wondering if there was a way to make an AND THEN gate. I remember wanting to do a project awhile back that had 2 outputs. But i only wanted this to work based on the sequence of inputs.
If Input 1 was true AND THEN input 2 (and then 3,4 and so on), do this. Otherwise do that.
I figured i COULD use an AND gate for that, but i wouldn't get the desired effect because the inputs would need to go in a sequence, not at the exact same time. And I couldn't use an OR gate because it would trigger the event if either input had a value, and all inputs would need to be active.... just in a sequence, kinda like a checklist. I ended up forgetting the project because no matter what i did i couldn't get the desired effect. it was always either all or nothing.
Sounds like you need a latch or flip flop to serve as memory. What you're describing would be formalized as a "Moore machine". Give that a search and you'll find some good resources.
What's the point of R4 at 1:44?
what is the use of R4 in AND gate? plz some one explain....!
Can someone tell me, why doesn't the LED light up in the NAND gate when the switches are closed? Wouldn't there be electricity passing through every path? Why does it move away from the LED? This is some basic thing that I am missing so I would really appreciate any help.
My guess is the transistor literally pulls charge down the emitter path and since an LED is a diode it won't light up with charge going the opposite way.
It would be good if you guys slowed down the video during that actual construction of the circuits. Also I would to see you guys tackle forrest mims led/Light flasher circuit using an NPN and PNP transistor. It would at the very least be very educational with transistors.
this is the only woman who makes me understand. Where did she go?
Great video. It pays to look under the hood .
For someone like me that is a beginner, I found that you flew through these examples to fast. Normally your videos have a much slower pace that I can keep up with. Maybe I'm just getting dumber 😭😭😭 Still, thank you and I'm always happy to see a new release 👍
Don't be worried in no time you will be able to keep up if you keep learning👍👍👍
You do realize that you can pause, skip and replay TH-cam videos, right?
It's a struggle to keep the information slow enough, but also include everything I want to in a particular video. Sometimes I have to compromise on speed in order to fit everything. Hopefully you can scan back or rewatch until it makes sense. Thanks for watching!
TTL, HELL YEAH!
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please explain about of4047ic.
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Why is R1(330ohm) and R2 10k??? Between R1 and S1 there will be 0.02amps then R2 will be 9/10,000 =0.0009???
Uh... those transistors are BJTs.... why not use mosfets?
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Why? Retro is ok to a certain point but this is crazy.
To understand how it works. If you understand how this circuit works with transistors, you can understand how it works within the IC. Because LEARNING! Yay!
There is no "Gate" in a NPN transistor. There is only a base. These are not IGBT's
I noticed that to., i think she marked them that way coz she was using them as logic gates
Whoops, lol! Those labels were added last minute and well after I had worked on this. That was an error. Nice catch! I think @keith king is right, I had gates on the brain and just got my FET and transistor lead names mixed up.
@@maker_karen1785 easy mistake to happen.. very cool video never thought of using bjt's that way. And knowing this this simple trick will come in very handy👌👍
Nor MOSFETs.
Can i know your pls
Surprisingly there's no "first" comments..
@TehPsychedelic lol, exactly