Filter Design

Discussion in 'The Projects Forum' started by urb-nurd, Feb 28, 2015.

  1. urb-nurd

    Thread Starter Member

    Jul 9, 2014
    Hey guys/gals - i am wondering if there are any members here who could help in designing a filter for my circuit.
    let me elaborate, i am trying to filter down a 25khz pwm signal to a variable amplitude sine wave using an lc filter.
    I was wondering if there are any off the shelf emi filters that would offer a solution.
    The reason i say this is a paper published by my university in which a student uses an EMI filter for just this purpose, though he states it was an off the shelf filter rather than one composed of discrete components.
    I will be looking into filter design so as to allow myself to compose an lc filter, but i was curious about a simpler readily available solution.

    I have the feeling this is a silly question.
    I apologize for my ignorance to the matter.

    Any insight would be great.
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
  3. crutschow


    Mar 14, 2008
    An off-the-shelf EMI filter may indeed to what you need.
    What are the PWM and sine frequencies?