Filter Circuit Trials ...

[last updated: 2023-03-14]
Oscillators & Filters
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https://arduinoetal.net/?q=node/661/edit

• LP filter trials:
  • Summary:
    • Minimal LP filter worked to reduce 60Hz signal from sig gen.
    • Three identical banks in series
      Increased attenuation of target freq significantly
      from atten with single bank.

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  • Setup:
    Espotek sig gen configured for 60 Hz sine wave, 2v (pk-pk) amplitude
    input directly to ch-1,
    and to input of filter circuit
    Output of filter into ch-2.
  • First trial:
    Sig gen signal in ch-1 measures 1.08v pk
    simple, one-stage LP
    
    

    
    R = 2.7k, C = 1 uf, f_c = 59 Hz
    Filter output as measured on Espotek = 0.78v pk (2.8 dB)

  • Second trial:
    R = 4.5k, C = 1uf, f_c = 35 Hz
    Filter output as measured on Espotek = 0.56v pk (5.7 dB)
  • 3rd trial:
    2-stages in series, both simple LP with
    R = 2.7k, C = 1uf, f_c = 59 Hz
    Filter output as measured on Espotek = 0.36v pk (9.5 dB)

  • 4th trial:
    2-stages in series, both simple LP with
    R = 3.9k, C = 1uf, f_c = 41 Hz
    Filter output as measured on Espotek = 0.27 v pk (12 dB)
  • 5th trial:
    3-stages in series, all simple LP with
    R = 3.9k, C = 1uf, f_c = 41 Hz
    Filter output as measured on Espotek = 0.11 v pk (19.8 dB)

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