Electronics - Capacitors - Discussion

Discussion Forum : Capacitors - General Questions (Q.No. 8)
8.
What is this circuit?

mcq7_1040_1.gif
bandpass filter
high-pass filter
low-pass filter
differentiator
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
17 comments Page 1 of 2.

Ankit Anand said:   1 decade ago
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.

Ravi Patel gujju said:   6 years ago
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.

Lakshmanakumarvenkidusubbu said:   1 decade ago
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.

Suti said:   7 years ago
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.

Abd said:   8 years ago
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).
(2)

Abinanthana said:   1 decade ago
When the capacitor is placed on input side means hpf.

If its placed on output side means lpf.
(1)

Achu said:   1 decade ago
What is the circuit for low pass filter?

Can filters be drawn using inductor and capacitor?

Virendar said:   1 decade ago
How it is differentiator?. It is high pass filter because at high frequency Xc is small.

MOSIN said:   1 decade ago
As capacitor allows high frequency to pass and low to stop (dc).

Nitesh Jain said:   10 years ago
Abinanthana explanation is correct! I agree with you.
(1)


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