Hi!

I am a University student, and I have got a task, to imagine, how this circuit works, what does it do.

The second question is, what parameters should manipulate to change the output the appropriate way.

I am a bit lost.. what doest it do? How does it work?

I would really appreciate if somebody could tell me some info about it.

Thank you in advance!

 

hi Z,
Please post your best effort in answering how the circuit works, then we can help you.
E

 

Hello,

Lookup baxandall tone control.

Bertus

 

hi Z,
Please post your best effort in answering how the circuit works, then we can help you.
E

So, my task is to find out, what does this circuit do, and with parameters can you change to modify an output parameter (which depends on what the circuit purpose)

As Bertus wrote, it can be a tone control circuit. Thank you for your answer.

The three potmeters are to modify the amplify of a frequency band? Am I right?
If you have time and I don't ask too much, please explain me the working method, I'd like really to understand it.

Thank you!

 

Experienced electronics designers can look at the whole circuit and tell you what it does. When you lack that knowledge and experience you need to look at individual parts of the circuit.

What do R7 and R8 do?
R3?
C10 and R1?
C9?
R1, R2, U5A?
C7?

 

https://www.google.com/search?as_st...&as_sitesearch=&safe=images&as_filetype=&tbs=

 

Hello,

Lookup baxandall tone control.

Bertus

Definitely a 3-band Baxandall tone control - there is a good explanation in Doug Self's "Small Signal Audio" book. ISBN 978-0367468958
I have a copy of Baxendall's original paper if you are interested, but it is designed around pentode valves.

 

Take a look at my analysis here
https://electronics.stackexchange.c...-an-active-tone-control-circuit/583344#583344
And here
https://electronics.stackexchange.c...ons-about-the-baxandall-circuit/465967#465967

 

https://www.google.com/search?as_st...&as_sitesearch=&safe=images&as_filetype=&tbs=

Thanks Bertus and others! Your hints were very useful!

I have a second one, if you have more patient, please help me again! Thank you!
The question is the same...

 

Hello,

Here I have extracted the schematic from the PDF:


It looks like some kind of oscillator.
https://en.wikipedia.org/wiki/RC_oscillator

Bertus

 

Let's keep in mind that the apparent intent of the assignment is for YOU to apply what you have learned to the examination and analysis of these circuits. It is NOT for you to go out to the Internet and find someone to do that for you.

 

If you take the C3-C4-R6 and R4-R5-C2 network then what letter of they alphabet does the shape of them suggest? and there's a pair of them. Perhaps Twins?

 

Let's keep in mind that the apparent intent of the assignment is for YOU to apply what you have learned to the examination and analysis of these circuits. It is NOT for you to go out to the Internet and find someone to do that for you.

You are right, however with your help I could run simulations and learnt a lot. Thank you for your point and thanks to everybody who has suggestion according the circuits. There are tons of youtube vids, and the google is my best friend because I know what shall I search for.

 

You are right, however with your help I could run simulations and learnt a lot. Thank you for your point and thanks to everybody who has suggestion according the circuits. There are tons of youtube vids, and the google is my best friend because I know what shall I search for.

Google isn't quite your best friend because it never tells you the credibility of the sources! A good text book might be a better friend. Have you heard of Horovitz and Hill?

 

Google isn't quite your best friend because it never tells you the credibility of the sources! A good text book might be a better friend. Have you heard of Horovitz and Hill?

No, unfortunately I have never heard about it, yet... but I'm on it! Thank you!

 

No, unfortunately I have never heard about it, yet... but I'm on it! Thank you!

ISBN 9780521377096

 

Or if you want something free:
https://www.analog.com/en/education/education-library/linear-circuit-design-handbook.html
https://web.mit.edu/6.101/www/reference/op_amps_everyone.pdf

 

Hello,

Here are two versions of the mentioned book:
https://archive.org/details/learning-the-art-of-electronics-a-hands-on-lab-course/mode/2up
https://archive.org/details/the-art-of-electronics-3rd-ed./mode/2up

Bertus

 

Notice the high and low pass filtering caused by C3,C4 R6 and R4, R5 and C2. Also keep in mind this network causes a phase shift to the signal being fed back that depends upon the frequency. Do you see the feedback path from Q2 to Q1? Notice that if the signal was fed back directly it would be negative feedback and thus nothing interesting would happen but at a specific frequency the T and Pi filters cause a 180 degree phase shift causing positive feedback. I would recommend performing an AC analysis of those networks. It is an oscillator but why it oscillates is the million dollar question.