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

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SUMMARY

The discussion focuses on calculating the capacitance required for a low pass filter (LPF) to attenuate 60Hz noise while allowing a 3Hz signal to pass. The circuit consists of a 100 Ohm resistor in series with a capacitor. To achieve -10dB attenuation at 60Hz, users must utilize the LPF transfer function equation to derive the necessary capacitance value, starting from the corner frequency calculation.

PREREQUISITES
  • Understanding of low pass filter (LPF) design principles
  • Familiarity with transfer function equations
  • Knowledge of decibel (dB) attenuation calculations
  • Basic circuit theory involving resistors and capacitors
NEXT STEPS
  • Study the LPF transfer function equation in detail
  • Learn how to calculate corner frequency for passive filters
  • Explore decibel calculations for signal attenuation
  • Investigate practical applications of low pass filters in noise reduction
USEFUL FOR

Electronics engineers, audio engineers, and anyone involved in designing circuits that require noise filtering and signal integrity maintenance.

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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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...
 

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