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Simply generator!!!

Discussion in 'Electronic Basics' started by [email protected], Oct 20, 2003.

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  1. Guest

    Welcome!

    I need regulated (frequency and amplitude) sinus generator with LFM100
    active filter. Do YOu have somthing like that. Thank You for all
    responses.
     
  2. John Fortier

    John Fortier Guest

    First, I presume you are speaking of a sin wave generator, rather than a
    sinus generator, which might tend to be a bit snotty!

    Second, I also presume that you are referring to the LMF100 dual switched
    capacitor filter.

    Can you be a little clearer, please. Do you want to build the oscillator
    using the LMF100 or are you going to clean up an already generated signal
    using the filter?

    Actually, there are several far simpler methods you can use to generate a
    sin wave, but if you need to use the LMF100 for reasons of your own, I would
    refer you to http://cache.national.com/ds/LM/LMF100.pdf, which will give you
    all the information you need for the filter.

    As far as the oscillator is concerned, the LMF100 can be used for this but
    it is not well suited. It would be better to use a simple relaxation
    oscillator set to the frequency you want and use the filter to extract the
    base frequency from the square wave generated by the oscillator. A Google
    or Yahoo search for "relaxation oscillator" will give you all the
    information you need. http://www.du.edu/~etuttle/electron/elect10.htm gives
    you the information you need to build one from a 555 timer.

    On the other hand, a phase shift oscillator, as described in
    http://www.visionics.ee/curriculum/...ft Oscillator/RC Phase Shift Oscillator1.html,
    will give you a sin wave output directly for far les cost than an LMF100.

    It's actually quite simple to look these things up in Google or Yahoo, and
    the amount of information available out there is really amazing.

    Regards

    John
     
  3. Fred Abse

    Fred Abse Guest

    You have my undivided attention ;-)
     
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