How Do You Calculate Capacitance for a Low Pass Filter to Attenuate 60Hz Noise?

In summary, the conversation discusses using a resistor and capacitor in series to create a passive filter for removing noise at 60Hz with -10db attenuation. The resistor is 100 Ohms and the signal is at 3 hertz. The goal is to find the capacitance using the corner frequency, which in this case is the frequency of the signal. The equation for the LPF transfer function is needed to calculate the value of C.
  • #1
blumpkinpie
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A resistor and capacitor are in series. The signal is at 3 herts and a passive filter must be used to remove a 60hz noise with -10db attenuation. The resistor is 100 Ohms. HOw do you find the capacitance, I've been tryin it for an hour. Usually you would find it with the corner frequency but this question wants us to find the corner frequency using the capacitance. Please helppp!

Is the corner frequency just the frequency of the signal?
 
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  • #2
blumpkinpie said:
A resistor and capacitor are in series. The signal is at 3 herts and a passive filter must be used to remove a 60hz noise with -10db attenuation. The resistor is 100 Ohms. HOw do you find the capacitance, I've been tryin it for an hour. Usually you would find it with the corner frequency but this question wants us to find the corner frequency using the capacitance. Please helppp!

Is the corner frequency just the frequency of the signal?

Welcome to the PF.

What is the equation for the LPF transfer function? Vo/Vi = ?

You want to pass 3Hz and attenuate 60Hz by 10dB. Use the transfer function equation to figure out the value of C...
 

1. What is a low pass filter system?

A low pass filter system is an electronic circuit that allows low frequency signals to pass through while blocking high frequency signals. It is commonly used to reduce noise and interference in electronic systems.

2. How does a low pass filter system work?

A low pass filter system works by using a combination of resistors, capacitors, and inductors to create a filter that attenuates high frequency signals. The exact working principle depends on the specific design of the filter, but generally, it allows low frequency signals to pass through while blocking or reducing high frequency signals.

3. What are the applications of a low pass filter system?

Low pass filter systems are commonly used in audio systems, power supplies, and communication systems to reduce noise and interference. They are also used in signal processing and data acquisition systems to remove unwanted high frequency components.

4. What is the difference between a passive and active low pass filter system?

A passive low pass filter system uses only passive components like resistors, capacitors, and inductors, while an active low pass filter system also includes active components like transistors or operational amplifiers. Active filters have the advantage of being able to amplify the filtered signal, but they require a power source to operate.

5. How do I choose the right low pass filter system for my application?

The right low pass filter system for your application depends on the specific requirements of your system, such as the desired cutoff frequency, signal amplitude, and power consumption. It is important to carefully consider these factors and consult with a knowledgeable engineer or use online resources to select the most suitable filter for your needs.

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