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Variable duty cycle and frequency with a 555

Discussion in 'Electronic Design' started by captoro, Apr 25, 2013.

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  1. josephkk

    josephkk Guest

    Some do, more don't. Now catfish is a real dung eater. Don't trust me,
    check it out for your self.

    ?-)
     
  2. captoro

    captoro Guest

    edge speed ??? you mean harmonics ??

    K
     
  3. Martin Brown

    Martin Brown Guest

    The obvious question is why would you bother?
    The faster waveform rise time means that the higher harmonics of the
    fundamental remain significant. In the limit that the waveform becomes a
    delta function like spike then all harmonics are present with equal
    weight. A real narrow pulse has finite width. I presume this is a device
    designed to destroy MOSFETs and CFLs in roughly equal numbers!!!

    BTW be careful if you end up flashing bright lights at frequencies in
    the 5 to 15 Hz range as if you are even slightly prone to epilepsy at
    the wrong frequency you could end up on the floor twitching in a fit.
     
  4. Fred Abse

    Fred Abse Guest

    What do they feed those? Sure it ain't made from chicken droppings?
     
  5. josephkk

    josephkk Guest

    Not perfectly, but yes. The fast edges mean lots of high order harmonics.
    To help with the idea 1 microsecond edges mean plenty of 1 MHz range
    content, likewise 1 nanosecond edges mean plenty of 1 GHz range content.

    ?-)
     
  6. josephkk

    josephkk Guest

    Hmm. Make that omnivores, the eat grain as well as worms, grubs and
    insects when they get feral.

    ?-)
     
  7. amdx

    amdx Guest

    I find it difficult to read by that light.
    Yes, it reminded me of my 7th grade English class,
    Boring.
    Mikek
     
  8. amdx

    amdx Guest

    I got the impression that the core was a little bit jumpy!
     
  9. amdx

    amdx Guest

    sci.electronics.you.ask.i.won't.answer
    sci.electronics.do.the.math
    sci.electronics.i.don't.know.the.math
    sci.electronics.phil's.angry.name.calling
    sci.electronics.how.far.can.a.thread.drift
    Mikek
     
  10. How about solution-oriented newsgroups? Eg.

    sci.electronics.555
    sci.electronics.PIC
    sci.electronics.sallen.key
    sci.electronics.howland

    Problems should be posted in an appropriate group for that solution.
     
  11. Ralph Barone

    Ralph Barone Guest

    sci.electronics.12.angry.men (plus or minus a few)
     
  12. Bill Sloman

    Bill Sloman Guest

    Then we'd need another group

    sci.electronics.tell-me-how-to-define-what-I-think-I'm-trying-to-do.
    Mike doesn't realise that this is actually an alias of


    set up for mutual admiration sessions between him and Jim.
     
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