Electronics - Capacitors - Discussion


What is this circuit?


[A]. bandpass filter
[B]. high-pass filter
[C]. low-pass filter
[D]. differentiator

Answer: Option B


No answer description available for this question.

Mosin said: (May 18, 2011)  
As capacitor allows high frequency to pass and low to stop (dc).

Rita said: (Sep 12, 2011)  
at high frequency Xc is small.

C.P. Borkar said: (Nov 17, 2011)  
I Agree with ritu

Lakshmanakumarvenkidusubbu said: (Dec 5, 2011)  
That is right. At high frequency that capacitor allows all current flow. Then this current flow will intern produce voltage drop in the load resistor R1. But at low frequency the capacitor give more resistance to the current flow.

Sudha said: (Jan 6, 2012)  
This is also diferentiator.

Ankit Anand said: (Mar 23, 2012)  
Xc= 1/(2*pi*f*C)
Also, applied voltage V= Vc + Vr
At low frequency, 1/f is large and hence impedance offered by capacitor is also large. So, voltage drop woould be considerable across it.
On the other hand, at high frequency, 1/f gets small and hence capacitive reactance also small. Major voltage drop takes place across the resistor, or better call load.
Thus, at higher frequencies, we are getting Output voltage more close to the input. So, it is a high pass filter.

Sameer said: (Aug 29, 2012)  
at high frequency Xc is small.

Ashish said: (Sep 25, 2012)  
It is a differentiator.

Virendar said: (Jun 28, 2013)  
How it is differentiator?. It is high pass filter because at high frequency Xc is small.

Abinanthana said: (Oct 5, 2013)  
When the capacitor is placed on input side means hpf.

If its placed on output side means lpf.

Achu said: (Feb 2, 2014)  
What is the circuit for low pass filter?

Can filters be drawn using inductor and capacitor?

Nitesh Jain said: (Mar 31, 2016)  
Abinanthana explanation is correct! I agree with you.

Abd said: (Aug 4, 2017)  
Capacitor allow ac and block dc, here is ac supply are given and capacitor placed at the begining so it means it is high pass filter (hpf).

Parvathy Soman said: (Jul 11, 2018)  
How come this not a differentiator? Explain.

Suti said: (Oct 1, 2018)  
This is circuit is both high-pass filter and a differentiator. But if we need to choose the best answer it would be high-pass filter since it is most practically used as a high-pass filter.

Pogi said: (Nov 23, 2018)  
What is a differentiator here?

Ravi Patel Gujju said: (May 19, 2019)  
It is a high pass filter that all we are knowing.

But, it is not a differentiator.
Reason: because for a good differentiator.
1) T(RC time constant) <= 0.1T(fundamental freq)
2) Xc>= 10R.

Here not a single condition is matching with differentiator property.

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