[time-nuts] Zero-Crossing Detector Design?

paul swed paulswedb at gmail.com
Thu Jul 19 19:23:30 UTC 2012


you can search time-nuts there has been a number of very good discussions
on this.
Sorry to say how you search is equally a good question.

On Thu, Jul 19, 2012 at 3:19 PM, Chris Hoffman, KG6O <cq.kg6o at gmail.com>wrote:

> Thank you, Azelio! I don't suppose there's an impromptu FAQ page out
> there, is there?
>
> -CH
>
> On Jul 19, 2012, at 11:58, Azelio Boriani <azelio.boriani at screen.it>
> wrote:
>
> > This is sort of a FAQ: the argument was already discussed here. One of
> the
> > most interesting idea (in my opinion) is to use an RS485 line receiver
> like
> > the ST3485, MAX483, ADM485. They are actually transceivers so they must
> be
> > tied permanently in RX. Since they are differential you can also put a
> 1:1
> > (or a 1:4 to raise the level) transformer to isolate the input too.
> >
> > On Thu, Jul 19, 2012 at 6:03 PM, Chris Hoffman <cq.kg6o at gmail.com>
> wrote:
> >
> >> Can anyone suggest a good reference design for a zero-crossing
> detector? I
> >> am trying to home an ADC sampler trigger to the 1VRMS (50ohm) 10MHz sin
> >> from my XL-DC... And now I'm thinking that I should just home the uC
> clock
> >> to it, as well.
> >>
> >> Essentially, I believe that I'm looking for an efficient, stable, and
> >> accurate sine-to-square converter... and I'll welcome any advice in this
> >> area.
> >>
> >> This may also be used in a 1KHz 5Vpp IRIG-B decoder... I don't feel like
> >> rectifying the signal, to be honest. I want to try to keep a smaller
> BOM,
> >> sense the waveform primarily, and crunch numbers inside the uC.
> >>
> >>
> >> -CH
> >>
> >> Chris Hoffman
> >> cq.kg6o at gmail.com
> >> http://ar.ctur.us
> >>
> >>
> >>
> >>
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