Troubleshooting Series LC Filter: No Resonance, Voltage Gain, or Current Output

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Discussion Overview

The discussion revolves around troubleshooting a series LC filter that is not exhibiting expected resonance, voltage gain, or current output. Participants explore the configuration and operation of the filter, including component values and circuit setup.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant describes their setup with a 1.923 Henry inductor and a 0.1 micro Farad capacitor, noting issues with resonance, voltage gain, and current output.
  • Another participant asks for clarification on the input and desired output frequencies, suggesting that the filter is passive and referencing external resources for further information.
  • A different participant inquires about the type of filter desired, whether a series filter or a T (shunt) filter configuration is intended.
  • One participant mentions that to achieve voltage gain from a series tuned circuit, a specific setup is necessary and estimates the resonance frequency to be around 363 Hz, also noting the importance of a 10 ohm resistor for current flow.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the cause of the issues with the filter. Multiple viewpoints regarding the configuration and requirements for achieving resonance and gain are presented.

Contextual Notes

Missing details include the specific frequencies being input and the intended filtering goals. The discussion does not resolve the mathematical or technical steps necessary for troubleshooting the filter.

Idea04
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I'm having problems filtering out certain frequencies from others with a series LC filter. I have a 1.923 Henry DC filter choke inductor set in series with a 0.1 micro Farad capacitor. I send the signal through the inductor to the capacitor and output from the other side of the capacitor. I'm getting no resonance, no voltage gain and no current output. What am I doing wrong?
 
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Hi idea04-
I show two filters with the component values you are using. What kind of filter do you want, series filter, or T (shunt) filter?
Bob S
 

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  • Filter_T_res10.jpg
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To get voltage gain from a series tuned circuit, it needs to be set up as in the attached diagram.

I estimate it would resonate at about 363 Hz.

The 10 ohm resistor is necessary to complete a high current path through the series circuit.


Edit, sorry, the attachment didn't upload. Tried again.
 

Attachments

  • series cct.JPG
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Last edited:

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