How does a voltage divider bias affect transistor base voltage?

[Averagesupernova]

So not limited Base can drain as much current it wants

Please explain your thinking here so maybe we can get you on track. What you've said is quite simply wrong.

 

[LvW]

Yea I tried to think of the upper resistor as an Rb. The thing is that the current is splitting into two pieces.
One piece is going into base which doesn't have Rb and the other piece is going into R2. So not limited Base can drain as much current it wants

It would help us if you could say about which circuit you are speaking (drawing).
Otherwise, misunderstandings are unavoidable.

 

[Xenon02]

Please explain your thinking here so maybe we can get you on track. What you've said is quite simply wrong.

Sure thing I'll use pictures to visualize my vision of it.

Basically I see it like that. There is Rb that limits the current from voltage source that is going into transistor because he himself cannot.
When I see the divider that has this current flow :

And the current is splitted into transistor that doesn't have Rb and it splits also to R2.

Transistor without Rb look like that in my eyes :

Of course the part only with transistor that doesn't have Rb. Because here in this picture the transistor can take any amount of current.

 

[Xenon02]

It would help us if you could say about which circuit you are speaking (drawing).
Otherwise, misunderstandings are unavoidable.

I'm sorry I was talking about the circuit with LEDs.
But I would like to stick with your recomendation and start with basics and using these basics understand the further. For example I've made an analize in Post#10 you can check if it's correct.
Because my mind set is stuck in the analizys in post#10 which transistor needs to have Rb and struggles to understand why the divider works when transistor doesn't have this Rb. Or combinations with many transistors.
Let's try from the very beginning and progress.

 

[Averagesupernova]

I've looked at your diagrams in post #63. Equating the second and third diagrams would be flat out wrong.
-
Take the first diagram and add a resistor tied to the base and emitter. Why is it you think that somehow by doing that it is the equivalent of having no resistors at all?

 

[Xenon02]

Take the first diagram and add a resistor tied to the base and emitter. Why is it you think that somehow by doing that it is the equivalent of having no resistors at all?

Add resistor you mean the add it to the 1st picture in post#63 ?
If yes then it would look like that :

Which there is a limit and the transistor that has no limit and another resistor.
Why is it like that ? I don't know because it wasn't covered in any tutorial nor in basics from websites. I just know that Rb there is direct limit for transistor.

 

[LvW]

I'm sorry I was talking about the circuit with LEDs.
But I would like to stick with your recomendation and start with basics and using these basics understand the further. For example I've made an analize in Post#10 you can check if it's correct.
Because my mind set is stuck in the analizys in post#10 which transistor needs to have Rb and struggles to understand why the divider works when transistor doesn't have this Rb. Or combinations with many transistors.
Let's try from the very beginning and progress.

Xenon02 - sorry to say, but it is not easy to discuss with you because you are not very "systematic".
You have agreed to analyze one particular circuit - and what is the result?
Again three different circuits - two of them without any practical relevance.
More than that, you continue to speak very often about a resistor Rb - and we only can guess what you mean. I cannot see any Rb in your drawings.

 

[Averagesupernova]

Add resistor you mean the add it to the 1st picture in post#63 ?
If yes then it would look like that :

View attachment 314904
Which there is a limit and the transistor that has no limit and another resistor.
Why is it like that ? I don't know because it wasn't covered in any tutorial nor in basics from websites. I just know that Rb there is direct limit for transistor.

Rc limits current no matter what. Are you able to see the schematic that you drew on a resistor is the same as the original with the push button as far as base associated components?

 

[berkeman]

Thread closed for Moderation...

UPDATE -- I'm in a PM conversation with the OP about learning resources right now...