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Filters

Discussion in 'General Electronics Discussion' started by CiaranM, May 20, 2012.

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  1. CiaranM

    CiaranM

    74
    1
    May 19, 2012
    I'm in need of a bit of help regarding filters. Specifically, filters with inductors.
    I know how RC filters work, and I understand reactance, and that a resonant frequency is formed when capacitive reactance is equal to inductive reactance.
    Some questions:
    - what is the equation for a LC filter?
    - what is the equation for a LRC filter? Is it RC's f=1/2piRC?
    - is it possible for the resonant frequency to be different to the cut-off frequency?
    - is it possible to increase the amount of resonance in a circuit? some sort of feedback, perhaps?

    thanks.
     
  2. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    This is governed by the 'Q' factor of resonant circuit. The higher the Q the greater the resonant voltage developed across a tank will be. Q effects both parallel and series resonance. There are circuits known as "Q multipliers". Google it. BTW, whole hard cover text books have been written on filter design. It's a science unto itself. Particularly when dealing with RF, as input and output impedance is of paramount importance,

    http://www.radio-electronics.com/in...f-filters/simple-lc-lowpass-filter-design.php

    http://circuitcalculator.com/lcfilter.htm

    http://www.corollarytheorems.com/Design/filter.htm
     
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