[time-nuts] Zero-Crossing Detector Design?

Chris Hoffman, KG6O cq.kg6o at gmail.com
Thu Jul 19 20:32:51 UTC 2012


Actually, I being new to the list, I do not feel I the correct verbiage. That said, I will do better on keeping the noise down. Again, my thanks.

-CH

On Jul 19, 2012, at 12:23, 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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