Explain this circuit????

[angy]

Attach file contains OP amp circuit possiably pulse generation.Kindly if anyone can explain this circuit

 

[FvM]

It's a modification of a widely used OP relaxation oscillators. Refer to the explanation of the basic circuit to understand it's operation:
Relaxation oscillator - Wikipedia, the free encyclopedia

 

[muthukumar_ece2004]

I could not able to find the attached! Can you make it as visible, so that we can explain it!

 

[angy]

ita already their kindly login and view

 

[muthukumar_ece2004]

ita already their kindly login and view

Hai, without login, how can i post this! Plz re-attach it.

 

[angy]

What is the purpose of resistor R29.

---------- Post added at 09:40 ---------- Previous post was at 09:38 ----------



---------- Post added at 09:43 ---------- Previous post was at 09:40 ----------

What is the purpose of resistor R29.

---------- Post added at 09:40 ---------- Previous post was at 09:38 ----------

OOPs its R2 not R29

 

[FvM]

There's no R29, I guess you mean R2.

It's one of the modification to the standard circuit. It changes the time constant respectively oscillation frequency, but in my opinion, not serving a reasonable purpose. As long as R6/R1 > R3/R2, the circuit will work however. I suggest to use a circuit simulator (e.g. free LTSpice) to evaluate the effect of various circuit modifications. Or calculate everything by pencil and paper, if you like to.

 

[angy]

Rated voltage for Capcitor C1 is 100V,Why do we need such a large capacitor voltage.????

 

[FvM]

Rated voltage for Capcitor C1 is 100V,Why do we need such a large capacitor voltage.????

Why do you think, 100V would be needed? I guess, that a film capacitor has been used, this type is mostly available with rated voltages of 63V or above.

By the way, I'm able to recognize a question with a single question mark. I guess, other users too.

 

[leo_o2]

It is a sine-wave generator?

 

[angy]

Its a pulse gernerator because