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Frequency sintetizer for heterodyning

Discussion in 'Electronic Basics' started by Alessandro Esposito, Aug 19, 2003.

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  1. Hi,
    I have two very wonderful IFR signal generators but also quite
    expensive. They are perfect but I want to test some cheap version of my
    instrument that is an advanced microscope.
    I know people replaced, in applications as mine, a signal generator with a
    NE555... wow... I mean... I worked with NE555 14 years ago when I was 14
    y.o. :)
    At the moment I'm working at MHz region with two equal but tuneable
    frequencies with a certain phase delay between them. Supposing to move in
    the KHz region I think I could use NE555.
    So the questions are:
    1) does exist an easy way to use to coupled NE555 with the same frequency
    but with a adjustable phase delay between them?
    2) is it possible to use NE555 to have two slightly different frequencies,
    in the way I can control the difference?
    3) is there some chip easy to use as the NE555 but that work in the MHz

    Ok... I thank you anyway... hoping for some suggestion or references. Is
    there some website with schematics?
  2. Fred Abse

    Fred Abse Guest

    I thought they were for giving to students to play with :)
  3. in that case was not for heterodyning but homodyning and was a work in which
    they didn't need do be very precise.
    In my case I could try to "downgrade" all the system for particolar
    Anyway I got that for these reasons is impossibile to make heterodyning for
    the intrinsic unstability.
    Not a problem I think... there are a lot of low-cost possibility :)
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