Finding Cut-Off Frequencies in a Circuit: A Lab Experiment

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In summary, for the lab result shown in the circuit figure, the question is to find the cut-off frequency based on the result in the table. The suggested approach is to extend measurements below 20Hz and above 20kHz to find the cutoff frequencies, as the gain at the middle frequency is 17.6 dB and the cutoff frequencies are where the gain is 3dB below that.
  • #1
basimjmal
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i did the lab and find all varible
but I can understand how find cut-off frequency
the question is
From you result in table Find the cut-off frequency


circuit figure

1ibud1.jpg


lab result
http://img19.imageshack.us/img19/6967/80959768.png


thanks so much in advance
 
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  • #2
go to this link...there is a answere for ur queston...it seem to be as band reject filter..
check this out

http://knowhowstuff.blogspot.com/search/label/Physics%20Q%20and%20A
 
  • #3
The cutoff frequencies arethe frequencies where the gain is 3dB below the gain at the the middle frequencies.
Since your gain at middle frequency is 17.6 dB, you should extend your measurements below 20HZ and above 20kHz (probably several MHz), to find the cutoff frequencies.
 

FAQ: Finding Cut-Off Frequencies in a Circuit: A Lab Experiment

1. What is the cut-off frequency?

The cut-off frequency is the point at which a filter or system begins to attenuate a signal, or reduce its amplitude, by a certain amount. This is typically measured in Hertz (Hz) and is important in understanding the frequency response of a system.

2. How is the cut-off frequency calculated?

The cut-off frequency can be calculated using the formula fc = 1 / (2πRC), where fc is the cut-off frequency, R is the resistance in ohms, and C is the capacitance in Farads. This formula applies to simple RC filters, but other types of filters may have different equations for calculating the cut-off frequency.

3. What factors affect the cut-off frequency?

The cut-off frequency can be affected by the values of the components in a circuit, such as the resistance and capacitance. Additionally, the type and design of the filter can also impact the cut-off frequency.

4. Why is the cut-off frequency important?

The cut-off frequency is important because it determines the range of frequencies that a system can effectively filter or pass through. It also plays a role in shaping the frequency response of a system and can impact the overall performance and functionality of a circuit or device.

5. How is the cut-off frequency used in real-world applications?

The cut-off frequency is used in a variety of real-world applications, including audio systems, electronic filters, and communication systems. It helps to control and limit the frequencies that are transmitted, received, or processed by these systems, resulting in clearer and more reliable signals.

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