Below the circuit, I am having difficulty getting the voltages and currents at each node and how it produces a square wave at vout. Can someone please explain all this to me?

 

hi hh,
Please post your LTS asc file.
E

 

hi hh,
Please post your LTS asc file.
E
see attached.

 

hi hh,
Is this what you require??
E

 

hi hh,
Is this what you require??
E
View attachment 340788

No i want to know how you derive the numbers at each node.

i know the numbers but how do you do calculation at each node to get those numbers

 

Second semester homework?

 

Second semester homework?

Seriously. I am trying to build oscillator square wave from transistor did research and got this link. See below link. Circuit is from the link. I posted on link but thread was closed stating open new one. I am wondering how the circuit works. My brain stops working when feedback is involved.

https://forum.allaboutcircuits.com/threads/square-wave-oscillator-using-transistors.161612/

Why always you assume its homework. Can you or anyone here please help?

 

Because the question are so technical.
Don't take my response seriously I should have left a smiley face.

 

Do you recognize the configuration of the two transistors? I.e. can you name the circuit they form?

 

I am wondering how the circuit works.

I can tell you how it works and what voltages are present at the nodes at different times and how it's calculated.
For starters I prefer to ask you questions about different aspects of the circuit to see if you understand the operation and calculation.

 

Do you recognize the configuration of the two transistors? I.e. can you name the circuit they form?

which two transistors you want me to recognize configuration?

 

I can tell you how it works and what voltages are present at the nodes at different times and how it's calculated.
For starters I prefer to ask you questions about different aspects of the circuit to see if you understand the operation and calculation.

let's get started I am anxious to know how it works.

 

When power is first applied and in that instant what is the state of Q1?

 

When power is first applied and in that instant what is the state of Q1?

This is as far as I can go the voltage at Q1 collector would be 4.3V but I am not sure what I can do further to determine Q1 is on or off?

 

4.3 volts is correct. But that voltage is only if Q1 is conducting. What is the voltage on the base of Q1?

 

4.3 volts is correct. But that voltage is only if Q1 is conducting. What is the voltage on the base of Q1?

It would be 4.3-Vr1-VR5? I am trying a little hint would be great. Toughest part is to determine votlage at Q1, Q2 base

 

Unfortunately no.
It gets a little complicated because of current flow through the emitter-base and emitter-collector junctions.
Q1 is almost full saturated by current through R5. Therefore the collector voltage is slightly higher then the emitter voltage which makes the base voltage slightly higher then the emitter voltage.

 

Unfortunately no.
It gets a little complicated because of current flow through the emitter-base and emitter-collector junctions.
Q1 is almost full saturated by current through R5. Therefore the collector voltage is slightly higher then the emitter voltage which makes the base voltage slightly higher then the emitter voltage.

How did you determine current thru R5?

 

How did you determine current thru R5?

Measure the voltage across it is the most accurate way of coarse.
Or Vr5 = 5v -Vq1b

 

Measure the voltage across it is the most accurate way of coarse.
Or Vr5 = 5v -Vq1b

But you still have variable Vq1b so how did you know what Vq1b is?