Transistor Amplification
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- เผยแพร่เมื่อ 12 พ.ค. 2017
- Transistor Amplification
In this video we look at the differences in gain(amplification) between a couple of common NPN transistors, and how this effects current output.
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Please watch: "Diodes: The basic building block of all digital circuits"
• Diodes: The basic buil...
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Well done. I always remember more when there is a hands on explanation.
I don't know if you did this in a previous video, but it would be super helpful if you gave a quick and simple an explanation how/why transistors (or whatever component you're talking about in any given video) work/a practical application of them. Otherwise, your videos are my favorite to watch on this subject! Thanks!
Zachary Elkins hey, thanks for the kind words. I'll try and be more user friendly
Not related to this video specifically, but:
Your videos have been invaluable to me. I've really struggled with electronics for years but your videos have helped, more than most others. You're a great teacher. I just wanted to let you know that the time you take to make these and explain everything clearly is really really appreciated. Years on, your videos are now helping my teen son 'get' things he was struggling with, and pass far beyond the uk highschool electronics part of physics - and given him another interest, and us both time bonding on projects. It's also helped with his creativity.
Often good creators forget/may not be aware of the good they do in the world, and the effect they have. I wish I had you as a teacher and, given your nature in the videos, wish I knew you as a friend. Your channel is very much appreciated. Thank you
Thank you. I appreciate your kindness.
that was an awesome show im a fan of transistor and mosfets there are so many when i can learn about them is great you can use more in you shows i hope thanks
Thanks for the video, enjoyed this as well as many of your other ones too!
Adam Petrashune thank you
Thanks for the vid. Very useful!
It was really helpful, thank you
it was very practical and understand easily
The demonstration left me interested in seeing a more detailed conclusion about what we saw, but it was still something to type in to other searches about.
strange, I always thought amplification dealt with audio signals, not current flowing to an LED. Guess you learn something new every day, of course I was looking for a way to build a small amplifier for a home built MP3 Player
audio signals are current, so is voltage running to and LED, so I guess it makes sense. Good that you learnt something new!
Waves are waves. Light and sound work similarly.
What kind of tester did you use?
Where can I get one of those transistor testors?
thanks!
I have problem with this experiment. These BITS were operated in Switch or Saturation mode and second had different specs, mainly less resistance from its collector to emitter allowing more current flow. You need a small AC Signal for BJTs to Operate in the Amplifier mode. The AC signal changes the current from the C to the E in proportion to how the voltage signal varies on the Base.
what parameters in datasheet define the minimum signal that transistor can amplify.
So would not the LED be even brighter if you didn't use a transistor at all? I only ask because in this case the transistor only seems to be limiting current. Is it really amplifying anything with this setup? It isn't acting as a switch is it? So many questions....
Hi well done ....enjoyed it..
+Raj Dann Thanks
4:53 This circuit is much simpler than the other amplifier circuits I've seen on LearnEngineering, is this circuit you are showing us amplifying the voltage?
It's limiting the current flowing through the LED to beta times current flowing through the base, which is controlled by the resistor.
@@juliankwiatkowski1441So,... basically what we got was an applied math lesson without a full rundown of the math behind what we saw?
could you hot wire c and b? would that increase dc voltage? removing led light.
hook that up to your buffer circuit so you can see the amplification on the scope :P
Wait till the new scopes get here, then we will have some fun!
what was the type of transistor other than the 2N4401 i couldn't hear you well
Tried this on my full bridge rectifier it blew up and shocked me, thx
Yikes! How so?
Full bridge rectifiers don’t contain transistors
Don't Transistors amplify both Current and Voltage since they're both directly proportional based on Ohm's Law?
I'm guessing that 10k pot above the VO pin on the LCD is supposed to adjust the contrast which should make it easier to read.
Greg Lemons I've adjusted the pot. just doesn't get any brighter
Exactly correct.
I think it's the contrast that's making it hard to read, not so much the brightness.
Nice video,, I'm ece
How to connect transistors with battery or dc motor
Nice
How to know the CBE indentity of a transistor using the transistor value?
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does this mean I can amplify a voltage signal with a transistor? I'm attempting to amplify a small voltage from a wheatstone bridge connected to a strain gauge, in order to read it with a DAQ device, the voltage that's coming from the wheatstone bridge is only 2mV/V, and I'd like to amplify it to around 1000 times that
No a transistor is used to amplify a signal. You would want to use a transformer
Use low drift dc differential operational amplifier , with an offset control to set Vout =0 when Vin=0
with a with a well filtered +/- 5v DC power source; input short twisted pair of leads to wheatstone bridge.
4 resistors should be 100k 1% ( selected ) ; see Analog Devices Co. for schematic
Could any of you point me to a good video on the very basics of transistors? I barely understand their function as a switch, and nothing about the amplification part.
A transistor is basically kind of like a diode, except that instead of just two junctions there is a small area that acts like a rudder on a large ship- if you put just a little bit of current through the "rudder", a lot of current will flow through the whole transistor. Think of it like a water valve that is normally closed in both directions. However there is a portion of the valve that if you pressurize it with just a tiny amount of water pressure, that tiny bit of water pressure forces partly open a much larger valve. But that pressurized portion of the valve doesn't hold the pressure indefinitely- it leaks a little bit of water down to the low pressure side of the valve. So you have to supply it with a steady flow of water in order to keep tge valve open. The amount of water it leaks down is very small compared to the amount of water flowing through the valve though, so this valve lets you control a much bigger flow of water with a tiny flow. And certian types of transistors have different characteristics that make them more ideal or less ideal for certain applications. So the basic job of a transistor is to control a heavy current flow of electricity with a much smaller flow. This is a very important job because a lot of electrical signals that we use are very weak to begin with. So in order to make their output more useful, we use transistors to amplify that signal.
5:30
U should use photoresistor and write code in arduino to measure the light strength
Our light sensivity is logaritmic, so hard to differentiate %50 differance by eye or cam. If limiting factor is only B of transistor of couse.
3:20 Hey I guess it is cbe, so it was collector on the left and emitter on right. Correct me if I'm wrong.
ur right
If you are looking at the transistor face on, then its EBC left to right.
can we amplify the current from the free energy machines pol making ?
If you can you will become rich and famous
The “free” energy machines people are making are mostly not “free”. Most of the time when people talk about free energy they mean renewable energy, like wind or solar. The videos people are making are fake, if the machines really worked, they would be breaking a law of thermodynamics: energy cannot be created not destroyed, only transformed
Can we amplify the current from solar panels? My solar panel supplies 5 A, I need upto 7A .. how can i do it? Please help
A transistor amplifies signal by using available current to mimic the signal at a much higher amplitude. It doesn't make free energy. It's more like a record player that would only play a very weak sound if it were played with no amplification. In order to amplify, you need more power. The transistor does not supply that power, it simply modifies the incoming power to make it match the patterns produced by the record.
Add a pot to control base current.
why do we need to connect a resistor to the base?
Limit current
NPN transistors on the high side?
I don't understand, your setup circuit looks like that of PNP.
Makes no difference.
Makes big difference! Try it.
From experience LEDs are most bright from the top it's kind of focused.
where is the resistor from the base connected
It's connected to positive voltage
What is (Lux)
vari gud
Are you Canadian ?
Nope. Born and raised outside of Pittsburgh.
Are you Canadian
Nope
That poor LED... Why aren't you using a resistance?
Transistor tester display: From my limited knowledge with the i2c arduino versions and a bit of googling: the contrast isn't maxed out, turn the 10K pot in front of Transistor Tester text.
WKDworks I've adjusted it. it's a brightness issue, not contrast. but I appreciate you taking the time to write, and watching the videos
I just learned this myself through trial and error... Your setup is wrong in a number of ways. Your running both transistors at saturation so for all intents and purposes they are acting like switches and should work (within reason) identically. Also you have the load connected to the emitter which has current flowing both from the base and through the collector (which is bad because of lack of isolation (I could never get anything to work properly this way, once I connected the load to the collector things started working as I expected)). according to my still very modest knowledge; to not saturate the transistor you have to the lower the voltage on the base to below 0.7v (or thereinabouts), then you'll start seeing the amplification effect. (hope this comment helps someone :))
I think I see what you're saying. Saturation pretty much maxes out the transistor to whatever current it can handle across its leads, so the difference from one transitor to another may not truly reflect its actual amplification characteristics at below saturation levels.
The resistor he is using here to drive the base would be plenty enough to drive the whole LED without the transistor in place, so it's kind of not a good way of showing amplification. Cool video anyways, but to prove the principal of amplification, I would have used a much smaller resistor to drive the base.
@@HeyChickens And, instead of an LED, I'd have used an oscilloscope so that you could actually see the amplitude.
Lol turn off flash
this was about nothing
NUL A CHIER
Gods son Christ Jesus died on thee cross for our sins so that by believing in him we can have life...belief in Jesus be a free gift from the Father, given to them ( through thee hearing of his words ) whom He hath chosen for salvation
Hi, Dick. What was the purpose of posting your comment here?
This is a video about electronics, not religion. What gives?
@@BigRalphSmith good question