NOT Gates - Transistors Ep03
ฝัง
- เผยแพร่เมื่อ 30 ก.ย. 2017
- Now that we understand transistors, and have seen how they work in circuits, it's now time to build! We start off with the simplest NOT gate, observing the differences between an NPN setup and a PNP setup.
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I can't believe you used the blue led for us, now that is real love 🤩
Heh, only the best for you lot.
But really, it just LOOKS great, so I thought, why not?
Great tutorial! Thanks!
You're welcome! Very happy to be of help =)
Can you namr the models of the transistors and ohm rating of your resistors?
Hi and thanks for the video. I do have a question though. I want to drive the base of the transistor with a comparator (LM393). Since the output has little or no sourcing capability, can I eliminate the base resistor? I will of course try it myself, but just looking for some input. Thanks and keep up the great work.
Hello and thank you for your comment! I'm afraid I don't have a good enough understanding of the inner workings of a transistor to give you a definitive answer. From my limited understanding, there may be situations in which current may flow in unexpected ways (like from the base to the emitter for example, in an NPN transistor). To be safe, you should still use a resistor.
Hello, Will there really be no voltage/current between the LED and Battery when the switch is on? The bulb indeed goes off, but I was wondering if there still be slight voltage or, current in the wires connecting to LED or, is it "all" of the current goes through transistor path?
Hello and thank you for your comment! Unfortunately this is the part that I'm not so confident about as well, since for this series I only ever took the transistor to be "digital", ignoring other effects, so my research stopped there. So no, I can't guarantee that there is absolutely no current, though I suppose, if there is any, it would be very low.
Hey people, I might help!
If you use the rules of resistance in a circuit, you could assume that the current is simply very low, not zero.
Sadly this shows on my case, LED is just getting dimmed ^^
Now would you which would you say would be easier, creating a not gate with all the components you use here, or a raspberry Pi. I have an idea
Hello and thank you for your comment! You will practically never have to build gates out of transistors like this. I'm only doing it in this series to demonstrate how they work.
@@NERDfirst aaaaah so I'd be fine to get away with an normally open switch? The one that's on...when it's off? keep getting the name mixed up. Cause if so that would make this far easier. And thanks for the video! And the reply, I appreciate it!
It depends on what you're trying to do, but if you're trying to "invert" a button press, then yes, you would not need to build a complex setup like this.
What you're looking for though is a normally _closed_ switch ie. The circuit is closed and current can flow when the switch is not pressed. When pressed, the circuit is open.
Alternatively you can use a normally open switch and pull it up high when it is not pressed. Yet another alternative is to use a normally open switch "as is", and modify the value in code (since you're using RPi, this should be trivial).
5:45 : Electric current flows from negative to positive (ground to +5v) However, most engineers use "conventional current"
Hello and thank you for your comment! While yes, that is true, that's not what that arrow indicates (if you notice on the PNP side, the arrow is pointed the "right" way). I believe the symbol has more to do with a transistor convention rather than current flow.
What transistor model is that??
Hello and thank you for your comment! The transistors used in this series are PN2222A (NPN) and PN2907A (PNP).
Im using the P R O T O app and trying to build the pnp one but it doesn't seem to work. What am i doing wrong? I think im missing something
Hello and thank you for your comment! It's hard to tell without seeing your circuit. Common errors include ensuring the correct polarity and orientation of elements, and check resistor values.
Sometimes, simulators may also not work as you expect in situations it is not explicitly designed for.