Build a RC bandpass filter to pass only 60Hz

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Discussion Overview

The discussion revolves around the design of an RC bandpass filter specifically intended to pass a frequency of 60Hz. Participants are exploring the necessary components, such as capacitors and resistors, and discussing the type of filter suitable for this application, including considerations for active versus passive designs and the context of use in power supply applications.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant seeks guidance on the specific capacitors and resistors needed for a 60Hz RC bandpass filter.
  • Another participant asks for clarification on the application, filter order, polynomial type, bandwidth, and whether an active or passive filter is desired.
  • A participant specifies a preference for a Butterworth response with a bandwidth closely matching 60Hz, indicating the need for an active filter for a power supply application.
  • This participant expresses a desire for an integrated circuit that does not require a separate supply voltage and is programmed for a 60Hz passband.
  • Another participant cautions against using an active filter for power supply applications, noting that op-amps may not provide sufficient power output.
  • Questions are raised regarding the RMS voltage level of the 60Hz signal and the amount of power being passed through the filter.
  • Suggestions are made to consider LC passive filters as an alternative to active filters.

Areas of Agreement / Disagreement

Participants express differing views on the appropriateness of active versus passive filters for the intended application, indicating a lack of consensus on the best approach. Questions about specific requirements and design parameters remain unresolved.

Contextual Notes

Participants mention various design considerations, such as the need for an integrated circuit and the implications of power supply requirements, which may affect the choice of filter type. The discussion does not resolve the technical specifications or assumptions regarding the filter design.

Idea04
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I'm wanting to build a RC bandpass filter to pass only 60Hz. But I do not know what capacitors and resistors to use. Can anyone tell me what capacitor and resistors I should use?
 
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Idea04 said:
I'm wanting to build a RC bandpass filter to pass only 60Hz. But I do not know what capacitors and resistors to use. Can anyone tell me what capacitor and resistors I should use?

What is the application? What order filter do you want? What polynomial? What width? Active or passive? Is this for some power application?
 
I'm looking for a butterworth response, bandwidth to be as close as possible to 60Hz, active filter and it is for power supply. I have a lot of frequencies all on one line and I want to get rid of the unwanted frequencies. I was looking at different types of filters like the switched capacitor filter but it requires a separate supply voltage to operate. And the op-amp requires external parts. What I am looking for is an intergrated circuit that doesn't require a separate supply voltage to operate. And is programed to have a passband of 60Hz.
 
Idea04 said:
I'm looking for a butterworth response, bandwidth to be as close as possible to 60Hz, active filter and it is for power supply. I have a lot of frequencies all on one line and I want to get rid of the unwanted frequencies. I was looking at different types of filters like the switched capacitor filter but it requires a separate supply voltage to operate. And the op-amp requires external parts. What I am looking for is an intergrated circuit that doesn't require a separate supply voltage to operate. And is programed to have a passband of 60Hz.

You wouldn't normally use an active filter for a power supply. The active circuit would then have to supply the power, and you're not going to get much power out of an opamp.

What is the RMS voltage level of the 60Hz signal? How much power are you passing through? It sounds like you should look at LC passive filters:

http://www.diyaudio.com/forums/showthread/t-112384.html

http://electronicdesign.com/Articles/Index.cfm?AD=1&ArticleID=2874
 

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