[time-nuts] Zero-Crossing Detector Design?

[Chris Hoffman, KG6O]

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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