Darlington circuit

If you use a battery, you have to touch plus and the wire.
if it doesn´t work, your transistors can be another type. Google yours to find out how to connect the pins

for the circuit diagram click here: http://www.flickr.com/photos/31053250@N06/3181846197/

Category:

Education

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• darlington
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[Nadrealis]

I still don't understand how transitor's themselves amplify things. Correct me if I'm wrong but all they do is let current pass when a small voltage is applied to the base am I right?

[sciencoking]

Well, to be honest, I don't exactly know how all the (probably quantum-mechanical) effects in the transistor work, but the visible effect is that by applying a positive potential to the base, you change the conductivity of the silicon crystal between the collector and the emitter, or vary the resistance between them, which means that a perfect transistor starts to conduct a rather large current once the potential is applied to the base and a B-E-current is not even necessary

[rico199400]

Der schaltplan ist ein Blödsinn...bei mir leuchtet die LeD schon ohne zu berühren..obwhl es ein NPN Transistor ist..!!!!

[sciencoking]

bei mir funktionierts auf jeden fall. Benutzt du ne batterie oder ein netzteil?

Mit netzstrom muss man die Basis von T1 noch an masse anschließen (hochohmig), weil das netzteil spannungsspitzen erzeugt, die der darlington nicht mag (milli- bis mikrovolt, aber das ding ist ja sau emfindlich...)

[rico199400]

ohne netzspannung....

Wie waren Transistoren? HAts du evtl. noch die Werte?

[sciencoking]

ich würd mal folgendes versuchen:

find raus wo bei deinen transistoren B,C und E liegen, indem du ne schaltung baust, die nur einen transistor braucht.Dann kannst du es entsprechend mit dem darlington versuchen :-)

wenn du das schon weißt und die schaltung stimmt, versuch das mit dem Erden trotzdem mal ;-)

[tomasiop]

oo i love that song!!!!!!!

[migpics11]

@Nadrealis Hi Nadrealis. I had the same question. It doesn't make any sense when someone says that a transistor amplifies anything, because the transistor itself, does not produce power to amplify a signal. What it does do, is take a weak signal, and that weak signal controls the flow of a larger signal.

The best analogy for this is a lever. Picture a lever with one end very short, and one end very long. When you move the short end just a little bit, it causes the long end to move a lot.

[Nadrealis]

@spiritualitydesire Thank you for the clarification. This was 7 months ago and since then I have taken transistor & semi-conductor courses for my electronic engineering program at my Univ. Thank you for the response.

Cheers.

[spiritualitydesire]

@Nadrealis If you mean that the input signal (ac or dc) is small then the amplified output is grater, then where does the extra voltage come from? If this is your question, the answer is simple: it comes from the dc voltage Vcc or Vgg we supply to the BJT or FET transistor.

[TheTubejunky]

YAY, with a few lyrics and a search bar I have found this great song!♠♣♠

•Kraftwerk The Model•

☻Thanks again for the video and the song!■

[TheTubejunky]

whats that song? it seems to be stuck in my brain. I also noticed that a STS 9014 NPN tansistor does this with out the need for 2 of them. (but im sure the added gain helps make an LED much brighter depending on the supply voltage im using 5V regulated)

But anyway I want that song!!!! -=] great video/musical addition☻

[axel1973w]

very nice explanation !

[chameer4th]

very cool!! now i can use my jedi force to turn on a lamp XD

cant wait to try it out

[855h0le]

What was the Transistor's Part number ? Im going to take a double look at the diagram. Adding another pair or single could make this very sensitive. It gave me some very good ideas when I seen this video. Rather Helpful ones if that.. Thanks 4 the video..