Arduino Forum

Using Arduino => General Electronics => Topic started by: on Jan 01, 1970, 01:00 am

Poll
Question:
Option 1: Lumps of silicon votes: 2
Option 2: Lumps of germanium votes: 2
Option 3: Doped votes: 4
Title: What are transistors.
Post by: Muneeb on Jul 31, 2011, 09:01 pm
i dont understand about transitors, can someone tell about it. and sending me an image to explain it to me better
Title: Re: What are transistors.
Post by: simon.monk on Jul 31, 2011, 09:18 pm
http://en.wikipedia.org/wiki/Transistor (http://en.wikipedia.org/wiki/Transistor)
Title: Re: What are transistors.
Post by: Grumpy_Mike on Jul 31, 2011, 09:33 pm
This is a good one as well:-
http://www.kpsec.freeuk.com/trancirc.htm (http://www.kpsec.freeuk.com/trancirc.htm)
Title: Re: What are transistors.
Post by: AWOL on Jul 31, 2011, 09:50 pm
Why is a question about transistors a poll?
Title: Re: What are transistors.
Post by: Muneeb on Jul 31, 2011, 09:56 pm
can you post a video link of it
Title: Re: What are transistors.
Post by: Grumpy_Mike on Jul 31, 2011, 10:56 pm
A video link of what?
Title: Re: What are transistors.
Post by: Muneeb on Jul 31, 2011, 11:02 pm
transistor
Title: Re: What are transistors.
Post by: Grumpy_Mike on Jul 31, 2011, 11:07 pm
Why a video, they don't move:-
(http://www.reuk.co.uk/OtherImages/labelled-transistor.jpg)

Try and google for transistor lab videos, there are lots but actually reading about them is so much better.
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 01:07 am
EBC reminds me EAT BIG COOKIE
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 01:15 am
ok,
so if im right, transistors are who get electric current from the E, 
multiplis the energie from B,
and continue the circuit to C.

am i right?
Title: Re: What are transistors.
Post by: eddiea6987 on Aug 01, 2011, 02:44 am
http://www.youtube.com/watch?v=-td7YT-Pums (http://www.youtube.com/watch?v=-td7YT-Pums)

http://www.youtube.com/watch?v=Te5YYVZiOKs&feature=related (http://www.youtube.com/watch?v=Te5YYVZiOKs&feature=related)

http://www.youtube.com/watch?v=ZaBLiciesOU&feature=related (http://www.youtube.com/watch?v=ZaBLiciesOU&feature=related)
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 01, 2011, 06:35 am
Quote
so if im right, transistors are who get electric current from the E,
multiplis the energie from B,
and continue the circuit to C.


Well if you think of current flowing from positive to negative then this is the wrong way round. However, if you think about the direction electrons flow this is right.

A transistor doesn't generate current but allows a small current flowing in the base to emitter, to control a much larger current flowing from collector to emitter. 
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 01, 2011, 07:27 am
Quote
I don't remember EVER seeing a legitimate "poll" on this website.

We did have one on removing karma, that was the only one I have seen that was a real poll.
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 08:49 pm
Quote

A transistor doesn't generate current but allows a small current flowing in the base to emitter, to control a much larger current flowing from collector to emitter


ok, i connected the ground to the E,
then i connected a 5v to the B,
i continued the circuit of the grounds to C, hooking it up with an LED,
and finally connected the pin 13 to the other pin of the LED.

and its totally normal, nothing changed.
should it do somthing
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 01, 2011, 08:55 pm
No the cinfiguration will do nothing apart from blow up the transistor. What were you expecting it to do?
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 09:01 pm
UNDERSTANDING WHAT CAN I DO WITH TRANSISTORS
Title: Re: What are transistors.
Post by: AWOL on Aug 01, 2011, 09:24 pm
Shhh!

Quote
Understanding what I can do with transistors

Hint: You're using several million right now.
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 01, 2011, 09:30 pm
Get a new transistor.

Emitter to ground.
Base to a 1K resistor.
Other end of the resistor to you arduino output pin.
Collector to the LED's current limiting resistor, say 220R
Othe end of this to the cathode of the LED.
Anode of the LED to the positive supply.

Now turning the arduino pin on and off will turn the LED on and off.
The small current flowing in the base that is limited by the resistor to less than 5mA will switch the large current of 20mA lighting up the LED.
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 09:54 pm
nothing is working
Title: Re: What are transistors.
Post by: retrolefty on Aug 01, 2011, 09:57 pm

nothing is working


Then your doing it wrong. Post a drawing of what you are trying to wire up.

Lefty
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 01, 2011, 09:58 pm
Then you have either wired it up wrong, got the LED round the wrong way or you have a faulty transistor. Did you replace it because your previous circuit would have distroyed your previous one.

Have you set the arduino pin to the output mode in the setup() function?
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 10:09 pm
should it fade like a resistor
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 10:19 pm
well, the code is the BLINK
i just changed the delay function to 1
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 01, 2011, 10:22 pm
That will blink faster than you can see and so should look half on. When you say nothing works exactly what to you see?
You should have a delay of something like at least 500 to give half a seconds delay.
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 10:30 pm
wait,
i'm gonna come back in 20 minuts.
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 01, 2011, 10:37 pm
I only see two wires connecting your circuit to the arduino, there should be three. A 5v, a ground and a signal from pin 13.
Title: Re: What are transistors.
Post by: Muneeb on Aug 01, 2011, 11:29 pm
guesse what, my red led is dead.
and i felt really the transistor really hot after touching it
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 01, 2011, 11:37 pm
The transistor should not be hot check you have identified the leads correctly. Also have you sorted out the missing wire from those photos?
Title: Re: What are transistors.
Post by: Muneeb on Aug 02, 2011, 01:53 am
can you put photo of it, its gonna be easy for me to plug the wires
Title: Re: What are transistors.
Post by: Techone on Aug 02, 2011, 04:00 am
@Muneed

I look at your picture, and I want to know what type of transistor you are using - NPN ? PNP ? MOSFET ? What ?  Well you can tell by the number/letter in front of the transistor.  The one you are using is a TO-220 <-- Package type. That tell me it is a "power type" I can handle a few amps.. And yes IT WILL get HOT !! if a lot of currents go through it. ( need a heatsink ) Here the site I use when I have a number/letter of a unknow transistor. http://www.datasheetcatalog.com/ (http://www.datasheetcatalog.com/)

Ok for exammple, the number 2N3904 is a NPN small signal general purpose - TO-92 package can only handle small current.

Small current ===> a street  ( low traffic )  A high current ====> a 6 lane highway ( high traffic ).

And please tell us the number of that transistor you are using.
Title: Re: What are transistors.
Post by: Muneeb on Aug 02, 2011, 05:52 am
IRF520 Mosfet Transistor
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 02, 2011, 09:46 am
Now you tell me!!!!!
That is a FET it is not a transistor. All that stuff about how a transistor works is not relevant to your device. What is more your device requires 10V to turn it on. This is more than the arduino can supply so in general  you can't use this device with the arrangement you have been looking for.
So how did you identify the emitter base and collector on you device because it doesn't have them. It has a gate drain and source. So basically you have been lying when you say you have.
Title: Re: What are transistors.
Post by: Techone on Aug 02, 2011, 05:40 pm
I was having a feeling that was a MOSFET. That will explain the transistor got hot.  Kiss goodbye the LED. I hope the Arduino is still working. Why you simply use a 2N3904 or something like that ?  No parts, right ?
Title: Re: What are transistors.
Post by: retrolefty on Aug 02, 2011, 05:44 pm
Quote
That is a FET it is not a transistor.


So what does the T in FET stand for?  :D
Title: Re: What are transistors.
Post by: Techone on Aug 02, 2011, 06:00 pm
About the poll. The answer is None of the above. They are silicon type - 2N3904  and also germanium type - 2SB56. <-- That one is a oldie
Title: Re: What are transistors.
Post by: AWOL on Aug 02, 2011, 06:16 pm
About the poll....I made it up   ]:D  (because I couldn't remove it)

(I have an OC71 in my spares drawer, and an OCP71 I made by scraping the paint off an OC71)
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 02, 2011, 07:08 pm
Quote
So what does the T in FET stand for?

Don't know?

However he did talk about E B and C so it was a fair guess it was a bipolar.
How can you hope to identify the leads as EBC when you have a FET?

Quote
I have an OC71 in my spares drawer,

I have quite a few OC28 these are power transistors.
Title: Re: What are transistors.
Post by: Muneeb on Aug 02, 2011, 08:11 pm
what does MOSFET Transistors do?

connect the ground to the left pin
connect the 5 v to the center pin
connect the right pin to a motor
and connect the motor pin 13

it still does nothing

and this thransistor was in arduino uno kit
Title: Re: What are transistors.
Post by: AWOL on Aug 02, 2011, 08:27 pm
Quote
what does MOSFET Transistors do?

Well, there's always Google.
Title: Re: What are transistors.
Post by: Muneeb on Aug 02, 2011, 08:32 pm
i cant find any useful information
Title: Re: What are transistors.
Post by: Erni on Aug 02, 2011, 08:42 pm
Take a look at this Tutorial about FET , pictures and circuit

http://brunningsoftware.co.uk/FET.htm


And this :

http://brunningsoftware.co.uk/Transisor.htm

Title: Re: What are transistors.
Post by: AWOL on Aug 02, 2011, 08:59 pm
Quote
i cant find any useful information

I'm astonished.
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 02, 2011, 09:45 pm
Quote
and this thransistor was in arduino uno kit

Well complain because it can't be used directly without another NPN transistor, it is not a logic level device it requires 10V to operate it correctly.

Note that this tutorial:-
http://brunningsoftware.co.uk/FET.htm
(http://brunningsoftware.co.uk/FET.htm)
Will not work with the FET you have.
Title: Re: What are transistors.
Post by: Muneeb on Aug 02, 2011, 11:09 pm
so this mean an NPN transistor is way more better then a MOSPHET transistor?  :~

and does it also mean that MOSPHET transistors won't be useful in any of my futur projects  :~
Title: Re: What are transistors.
Post by: AWOL on Aug 02, 2011, 11:16 pm
Quote
so this mean an NPN transistor is way more better then a MOSPHET transistor? 

Woah!
Slow down.
What does any online search facility say about "MOSPHET"s ?

What, in fact, is a "MOSPHET" ?

Start doing some of your own research, before falling back on this forum.
Title: Re: What are transistors.
Post by: Muneeb on Aug 02, 2011, 11:18 pm
good idea, i guesse
Title: Re: What are transistors.
Post by: fkeel on Aug 02, 2011, 11:19 pm
nono

they are just different things. just like a capacitor is not better or worse than a resistor. some applications will need a regular transistor and others will need a mosfet.

if I where you I would worry less about what things do, and more about what you want them to do. think of a cool project you would like to build and set about doing it. using any transistor to make a led blink is a fairly pointless exercise anyway. I dont know a whole lot about electronics either, but I have learned how to use a transistor becouse I needed a transistor.... as long as you dont need it, dont worry about it.

p.
Title: Re: What are transistors.
Post by: Muneeb on Aug 02, 2011, 11:26 pm
so i will just keep it up the transistors later, and start my new and first project (a PING))) sensor that will make  like a piano sound each time we put our hand in front of the sensor)   :smiley-sweat:
so lets say bye bye this post for the moment  :D
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 02, 2011, 11:29 pm
Why are we all talking about a  "mosphet", have they changed the rules of spelling without telling me. I imagine a google search for a mosphet will show nothing useful so how about looking for a MOSFET standing for Metal Oxide Field Effect Transistor. This is different from the original junction  transistors just called transistors or to give them their new Sunday name bipolar transistors.

Fkeel
I am dyslexic and so I am very grateful to modern day spell checkers, they are not infallible but they do cut down on the number of miss spellings. So why do people who are not dyslexic not use them. I assume it is just becouse.

Bye Bye post .........
Title: Re: What are transistors.
Post by: fkeel on Aug 02, 2011, 11:37 pm

haha, yes. so am I, grumpy mike. I figure its becouse most of the time I assume that people will understand me... and I am lazy.

I just relized the mosphet/mosfet thing though while reading another post and came back to correct it.
Title: Re: What are transistors.
Post by: Grumpy_Mike on Aug 02, 2011, 11:47 pm
Quote
I figure its becouse most of the time I assume that people will understand me


Trouble was for me that for all of my school life this condition was not recognised by the educational establishment so I just got labeled as being thick. When I started as a University Professor this got changed to being dyslexic, I think it was something to do with the salary. I was once asked to give advice to dyslexic students and my best advice was "don't play scrabble for money".
Title: Re: What are transistors.
Post by: fkeel on Aug 02, 2011, 11:59 pm

haha. I actually am pretty good at scrabble. Its just in the act of writing that I fail. The language I learned reading and writing in is german and for some reason english is a *lot* easier for me. Having to write anything in german is just pure horror. Changing to a university which had english as an instruction language and mainly essays as evaluation form (so you can organize, write it well in advance and then take ten days to make sure what you have written is *actually* english) was the best thing that ever happened to me.

(anyway, this is getting very off topic. I will find myself some web based spell checking program though, better than copy pasting into word.)
Title: Re: What are transistors.
Post by: Muneeb on Aug 03, 2011, 05:13 am
i suck at speaking english, but i write in ensglish.
french is equal to secondry 1 and below.  :smiley-roll-blue:
Title: Re: What are transistors.
Post by: bill_kerr@shaw.ca on Aug 04, 2011, 06:23 am
Muneeb

As you are seeing, there is no simple answer.  It does take some learning.

Check out his web page for what you are trying to do
http://www.sqlskills.com/blogs/paulselec/post/Arduino-figuring-out-transistors-and-associated-resistors.aspx

I found it with a google of "Arduino transistor LED"

When researching you will see there are NPN and PNP transistors. 
The arrow used with the schematic indicates direction of current flow.
They can handle currents from several milliamps to Amps.
They are used in switching DC circuits (on/off) and AC for amplification. 
Input is to the base, as mentioned, the current on the base can be amplified on the emitter/collector
The gain in current (HFE) from base to can be as low as 10 to over 5000 with what is called a darlington transistor

Here is a good tutorial to help you out
http://www.electronics-tutorials.ws/transistor/tran_4.html

Regards  Bill


Title: Re: What are transistors.
Post by: Techone on Aug 04, 2011, 06:34 pm
@Muneeb

Here a basic electronics circuit simulation. It free, you can "buit" basic circuits, so you see what the circuit does and you can download the app.  it is a Java App, the con is can't save & print your work. Here the link.
http://www.falstad.com/circuit/ (http://www.falstad.com/circuit/) I hope it help you and it help others. That app help me out to figure things out.

If you want to pay for a better electronics circuit simulation, here the site. http://www.new-wave-concepts.com/ (http://www.new-wave-concepts.com/) . Anyway, check it out. I have Circuit Wizard Pro, it is expensive, but it is worth the investment. I made a few projects using that software.

I wish a Arduino simulator was available. ( I got VBB, not working right )  :P