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Hello, varactor(varicap) formula help

Discussion in 'Radio and Wireless' started by michael1978, Feb 18, 2018.

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  1. michael1978


    Mar 17, 2012
    THANK YOU A LOTTTTTTTTTTTT...........for helping ;-)
  2. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    I think you might want to check your decimal points. We are discussing capacitance on the order of ten picofarads. 0.00000000001 micro-farads is 10 pico-micro-farads (pmfd), a million times smaller than ten micro-microfarad (mmfd), which is a very small capacitance indeed.

    OTOH, 10 picofarads is 0.00000000001 farads or 10 micro-micro-farads (mmfd), which is still pretty damned small.

    It is for this reason (probably) that God invented microwaves and requires us to use waveguides and Smith charts and microwave strip-line techniques for tuning purposes instead of discrete inductors and capacitors. James Clerk Maxwell worked all this out ages ago during a direct communication from God. Sort of like Moses and the Ten Commandments, Maxwell and the Four Equations explains everything. Some study required.

    Here on EP there are just too many damn zeroes to keep things straight and in perspective, unless you can figure out how to express numbers in this forum using scientific notation: 0.00000000001 = 1 x 10^(-11) = 10 x 10^(-12) = 10 pico-somethings. OK, I suppose you could import exponential or super-scripted characters as images placed in-line with text, but that seems to be an awful lot of trouble. Maybe we should just compose text using a real text editor and upload or attach it as a PDF file. Nah, bad idea. That would really mess up the continuity of the threads. I have to open a separate app to read it, every time someone posts a PDF, which can be a real PITA.

    @Ian: hows come we can't insert sub-script and super-script characters using the on-line rich text editor?
    michael1978 and davenn like this.
  3. Ian

    Ian Administrator

    Aug 23, 2006
    Let me look in to this and I'll make a new thread on it :). I'll tag you in it once I've got an answer.
    michael1978 and hevans1944 like this.
  4. michael1978


    Mar 17, 2012
    thank you
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