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Freq. Independent Phase Shifter

Discussion in 'Electronic Design' started by Bill Murphy, May 9, 2010.

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  1. Phil Allison

    Phil Allison Guest

    "Spehro Pefhany"
    "Phil Allison"

    ** Still about 25 times the cost of 1% MF and of no benefit when the caps
    used are only 1% tolerance.


    ** LCR Components make polystyrene caps of 1% tolerance & Farnell / Newark
    sell them - among others.

    http://www.newark.com/lcr-components/mkp-hr-10000pf-1/capacitor-10nf-63v-capacitor-10nf/dp/73K0558

    $1.54 each in *one off* cheap enough for you - eh ???


    ** Really ???

    1% tolerance * silvered mica * caps are available in values like 10nF for
    big bucks.


    BTW:

    What the HELL is the point of your TEDIOUS BLOODY nit picking ????

    Got nothing better to do with your life ??



    ..... Phil
     
  2. Should improve things by about 30%.
    Cheap enough. I've heard a lot of complaints about poor availability
    of PS caps and PP caps.
    Yeah, 18125A103FAT2A AVX 10nF 1% NPO in 1812 form factor, but about
    five clams a pop in tens. http://www.avx.com/docs/Catalogs/ccog.pdf
    Apparently, not at the moment, Phil. How about yourself?


    Best regards,
    Spehro Pefhany
     
  3. Phil Allison

    Phil Allison Guest

    "Spehro Pefhany = PITA Wog Wanker "

    ** More nit picking hypotheses, not facts.

    Yawnnnnnnnnnnnnnn..............




    ** You oughta be MORE careful whose bullshit you decide to believe -
    pal.

    Especially your own putrid variety.




    ** You could always do the planet a real favour a top your stupid self.

    Maybe just choke to death on your own bullshit.

    Plenty of that on hand.



    ..... Phil
     
  4. Fred Bartoli

    Fred Bartoli Guest

    whit3rd a écrit :
    But it does!
    Pb is that with a pot you're mixing proportionally to the pot angle, not
    the sin and cos of the pot angle.

    IOW output = phi sin(w*t) + (1-phi) cos(w*t)

    (instead of sin(w*t) cos(phi) + cos(w*t) sin(phi) )

    which has a min sqrt(1/2) amplitude for phi=0.5
     
  5. Joe

    Joe Guest

    Maybe "Signal Processing Algorithms and Architectures",
    Hassan Masud Ahmed, PhD thesis, Stanford University, June 1982. (1981?)

    It is frequently cited* but might not be freely available online.
    *Eg in <http://www.computer.org/portal/web/csdl/doi/10.1109/12.403715> and
    <http://www.eecs.berkeley.edu/~newton/Classes/EE290sp99/lectures/ee290aSp996_1/cordic_chap24.pdf>
     
  6. YD

    YD Guest

    Late at night, by candle light, (Bill Murphy)
    penned this immortal opus:
    Try Visual Analyzer from http://www.sillanumsoft.org/ (freeware). It
    can generate separate signals in each channel, with phase added. Make
    up the third with a handful of opamps and resistors. You can lock the
    frequency settings so one adjustment alters both at the same time.
     
  7. YD

    YD Guest

    Late at night, by candle light, Jan Panteltje
    Doesn't take all that much time. The soundcard is usually there
    already, d/l'ing the sw is another few minutes (see my above post),
    the time to get used to it is about the same as fiddling with a real
    generator. Plus the sw comes loaded with a number of other goodies.

    - YD.
     
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