[time-nuts] Zero-Crossing Detector Design?

Azelio Boriani azelio.boriani at screen.it
Thu Jul 19 19:33:44 UTC 2012


Yes, there are no FAQ but you can search the archive. I don't know how to
search the archive because usually I start with google, adding "time-nuts"
to narrow down the search.

On Thu, Jul 19, 2012 at 9:23 PM, paul swed <paulswedb at gmail.com> wrote:

> 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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