how do i determine the cutoff frequency of this circuit, the answer given is fc=4.226 Hz

 

hi,
I guess you meant the title to be high pass filter.?

What do calculate the Low frequency -3dB point to be .?

E

 

Ya, high pass sorry about that.

 

Ya, high pass sorry about that.

no problem

Post your answer, we can check it for you.?

 

Yes, i don't know how the resistor connected in parallel with the capacitor affects the value.

 

Yes, i don't know how the resistor connected in parallel with the capacitor affects the value.

Do you know how to calculate the impedance Xc of the 10uF cap.?

 

yes 1/(2pifc)

 

yes 1/(2pifc)

Ok,
As this is homework I cannot give you the answer, but consider.

What the attenuation in the Output when the Freq=0 , also whats the attenuation when the Freq > 1000Hz.??

This should give you a clue that some value of Xc will give an attenuation of 0.5.

 

what does the resistor connector in parallel to the capacitor do then?

 

what does the resistor connector in parallel to the capacitor do then?

At Freq=0 the Xc is infinite, so the attenuation ratio from input to output is 1:0.5

At Freq > 1000Hz, the Xc can be assumed close to zero, so the attenuation ratio is 1:1

 

Hola Eric,

I am surprised I completely forgot how to suscribe to a thread (this one in particular now) other than posting in it. (?)

Could you please tell? Gracias.

 

Hola Agustin.
I am sorry I dont know.

Perhaps a Mod may point us both in the right direction.

Eric

 

Ok solved it using transfer function thx.

 

Ok solved it using transfer function thx.

hi,
Could you post your calculations, it could help other students.

E

 

Ok solved it using transfer function thx.

Hola rondo,

Out of curiosity I would like to see that!

Gracias.

 

Hola Eric,

I am surprised I completely forgot how to suscribe to a thread (this one in particular now) other than posting in it. (?)

Could you please tell? Gracias.

Hi.
You may try this.

 

Hi.
You may try this.

As usual, just in front of me.

Gracias!

 

Ok,
As this is homework I cannot give you the answer, but consider.

What the attenuation in the Output when the Freq=0 , also whats the attenuation when the Freq > 1000Hz.??

This should give you a clue that some value of Xc will give an attenuation of 0.5.

3dB point is at 1/sqrt(2) ~ 0.707

 

Ok solved it using transfer function thx.

Did you get the same answer 4.226 Hz as in your first message?
I got a different answer.

 

Hola Eric,

I am surprised I completely forgot how to suscribe to a thread (this one in particular now) other than posting in it. (?)

Could you please tell? Gracias.

When viewing a thread, go to the top of the first post on a page and select "Thread Tools". One option is to subscribe to the thread.