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Inverting the signal with a transistor | Digital electronics (9 …

Inverting the signal with a transistor | Digital electronics (9 ...



If we hook the things up a little differently, instead showing us the signal, the LED shows us the opposite of the signal!

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Tags: transistors

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23 Comments

  1. Date: October 28, 2015 at 10:26
    Author: vedant

    Thanks…. For this video….. And also when I connected my led from the collector to ground the inverted led glows but dims when I switch the transistor on ….. It should go off but it dims…. Please help …. And thnx again

  2. Date: June 16, 2016 at 05:14
    Author: James

    Brilliant. I needed this inverted design for something I was working on and this fits the bill perfectly! Thank you for the good quality video. Keep it up!

  3. Date: August 23, 2016 at 14:04
    Author: Chain Hong Lim

    The idea is simple, but it helps to create understanding of the logic and well as general application. Thank you for sharing

  4. Date: November 26, 2016 at 22:54

    Why is there equally 5 volts on each side of the resistor? Doesn't that violate Ohm's law?

  5. Date: December 1, 2016 at 20:53

    Wait!! Why does this work? It seems like when the transistor is on that current would be split between both the transistor and the led. Why does the led go completely out then??

  6. Date: December 5, 2016 at 23:59
    Author: Haim Bilia

    WOW your teaching is great, you really know how to make this stuff simple to understand!
    thank you very much!

  7. Date: December 6, 2016 at 01:33
    Author: FylX MistahX

    So from what I understand this happens because the led's ground is after the switch. This creates two path for the electrons to go through and they go through the less resisting? Would it be the same if we somehow had the positive of the led before the resistor and the ground after the switch?

  8. Date: December 29, 2016 at 20:15
    Author: MrFunTimez

    where the power supply enters the transistor to turn it on then out the other end of the transistor back to ground, u called a short circuit but wouldnt that ruin the power supply or battery?

  9. Date: January 10, 2017 at 19:41
    Author: Brian Zimmerman

    Wow, really nice, I knew that an inverted AND gate = NAND and with NAND circuits you can make ADDERS and LATCHES (FLASH NAND, etc.), but didn't understand how the inverted part works until now. This is a really important thing to understand, thanks!

  10. Date: April 3, 2017 at 12:40
    Author: phoenix

    but why does not the current get split between the LED and the transistor (when the transistor in on) thus the LED just gets dimmer………i mean if you put two resistors in parallel the current will split between the two, it does not choose to go through only one of the two !!! please explain it

  11. Date: April 9, 2017 at 20:36
    Author: Charlie McGuire

    So the current goes from the collector to the emitter if the base current is going, The terminology of "ground" here is confusing me a little. Isn't the current going from the emitter to the other terminal (negative?) of the power source?

  12. Date: June 30, 2017 at 20:47
    Author: Readme .txt

    Is it safe to connect power source (+5 V signal) directly to the base of the transistor and without the resistor to suppress a high current flow?

  13. Date: August 21, 2017 at 22:02
    Author: ??????? ???????

    Thank you very very much!!! Good explanation! It was very usefull for my project with self poweroff arduino!

  14. Date: October 6, 2018 at 16:29
    Author: Joe Bob

    Omg once u attached the second led it clicked in my mind

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