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  1. Date: June 14, 2017 at 13:46
    Author: Aswin

    In the xor gate what is the use of the middle 5V potential, Wouldn't it be the same without it.

  2. Date: June 22, 2017 at 22:35
    Author: theconkernator

    I have been having a lot of trouble getting this to work. Specifically, I can not get the B input to light by itself. In the schema that you do out. Would the potential difference between +5 and ground when the switch is turned on not take away the voltage that goes into the B transistor on the LED side?

  3. Date: June 28, 2017 at 04:04
    Author: ncarrasco2006

    Is there a guide that explains how to do a complete circuit analysis with those resistors / transistors ? I am interested to learn how to do those calculations. Thanks

  4. Date: June 30, 2017 at 18:31
    Author: Anton Gecko

    why do you connect the collector of the middle transistor on the xor gate to +5v?

  5. Date: July 3, 2017 at 13:09
    Author: Philipp

    Dumb question: Is the resistor directly "before" the +5V potential thingy necessary? And why?

  6. Date: July 3, 2017 at 16:29
    Author: MrLuke255

    Do we even need transistors in order to make an OR gate? Why don't just connect two inputs?

  7. Date: July 10, 2017 at 06:23
    Author: Mamoon Syed

    This is the simplest and most intuitive explanation of a transistor I have ever seen. Very good work.

  8. Date: July 14, 2017 at 22:45
    Author: Dustin Garrett

    Can somebody please help me understand this. On the AND gate where is his output at? If it is suppose to be at the LED then would it not be a NAND gate??

  9. Date: July 15, 2017 at 01:43
    Author: Jesus Garcia

    This is such a great video that I'll use with my HS students. However, can you please mention the resistor values on your diagram? It is particularly very important in the XOR diagram. -Thanks πŸ™‚

  10. Date: July 24, 2017 at 04:25
    Author: Rik Schaaf

    Question: with your inverter, when the base is powered, it is possible for current to flow through the transistor, but also still the LED. I understand that the current is split between both paths, but shouldn't there be a resistor before the LED to make sure most of this current goes through the transistor?
    Also for the XOR circuit, why would you need the middle 5V connection? From your explanation it seems redundant.

  11. Date: July 25, 2017 at 18:44
    Author: Chris Season

    why the fuck does everyone who teaches circuits assume the listener already knows about circuits

  12. Date: August 15, 2017 at 04:14
    Author: Alp Aktuna

    These videos are amazing. Kudos to you and your knowledge as well as your presentation skill.

  13. Date: August 31, 2017 at 08:28
    Author: fsgr ggr

    I don't get what the second 5V source does at 8:35. It has completely no use (or am I wrong?).

  14. Date: September 13, 2017 at 00:54

    you're an amazing're very eloquent.i enjoyed the lesson very much. so thanks a lot.

  15. Date: September 13, 2017 at 13:17

    But you can't output data with these gates to another gate, right? Because you are outputting the data to the led on the ground side of the circuits.

  16. Date: September 17, 2017 at 17:51
    Author: Ian Welsh

    Nice! This is my next circuit to build I think. Thanks for this. Very clear.

  17. Date: September 19, 2017 at 13:44
    Author: heretic

    thnx for a very clean and compact explanation, you realy made the topic so simple to understand

  18. Date: September 23, 2017 at 04:29
    Author: Morahman7vnNo2

    At the XOR gate, how does current flow from A to B to Ground if A is off (logic low?) and B is on (logic high)?

  19. Date: October 1, 2017 at 19:36
    Author: Tyler Friesen

    so is the current flowing through the led even when the transistor is on? is the current just to small to make a noticeable change? because I know that voltage is still running through the led its just too small to give a noticeable difference thanks in advance

  20. Date: October 14, 2017 at 17:33
    Author: Scrap Engineer

    well layed out video, easy to understand with the aid of diagram, this really reduce my study time, thank you!

  21. Date: October 25, 2017 at 17:11
    Author: Jakob Furbo

    Does pushing both buttons (or gate) make the led brighter or does a transistor not have a resistance?

  22. Date: October 27, 2017 at 11:55
    Author: Noiseconformist

    The XOR gate appears to be an XNOR actually. The positive voltage comprising a 'high' for the XOR output only can be found across the resistor and the LED in this circuit. So if this would be part of something bigger (which is most likely not the case anyway) the circuit would have to look differently.

  23. Date: November 8, 2017 at 09:45
    Author: Paul Campbell

    Unless I'm missing something the base of the transistors in your circuits are not pulled to ground when the switch is open. When I build these circuits my LEDs flicker and the DMM does weird stuff until I pull down the base to ground with a 1M resistor. How do you manage to avoid this?

  24. Date: November 13, 2017 at 15:05
    Author: Raja Ram

    thank u sir.plz tell about hardware also ie. components names,numbers,how to configure transistors,B,E,C pins.&ic nos pin configurations,SCRs,..etc.plz teach about all components,and how to use…latest cro tech..

  25. Date: November 17, 2017 at 19:40
    Author: Rui Ferreira

    hi mr. Ben, i "love" all thing you,sr.,explen(sorry my english first) i m hyptotyse with yours teaching its the best i ever see.please continun.i now, you sr.,have so many to teach, please continun, my name is rui im from portugal,and again to you and every one sorry my pre-historic english. all good things to you and your famaly and every one.

  26. Date: December 14, 2017 at 17:37
    Author: Billy Willy

    1:13 I always preferred electron current flow analysis over conventional current flow since electron flow is what is actually occurring. Not only that but with conventional current flow analysis you get inverted statements like, "current flows from collector to emitter", completely counter to the normal meanings of the terms.

  27. Date: December 15, 2017 at 22:01
    Author: Hedgehog

    seems to me that xor diagram on a scetch is a bit off, there is one odd 5v in the middle

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