[time-nuts] pictic improvements was PICTIC II ready-made?

David davidwhess at gmail.com
Fri Apr 27 15:16:31 EDT 2012


On Fri, 27 Apr 2012 10:19:17 -0500, "Stanley" <timenuts at n4iqt.com>
wrote:

>Several practical replacements were provided if the 74ac175 dip was 
>impossible to find, see the wiki :
>http://ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic
>
>The issue was the voltage level of on and off  not the speed of the chip, 
>one goal of the project was to keep the interpolators as simple as possible 
>and to use the PIC as much as possible. So the design has several options: 
>no interpolators, interpolators with and without the 2x gain buffer, plus 
>the option of a faster clock speed as a way to reduce the need for 
>interpolators.
>
>From my stand point the simple or low-cost made it possible to have as many 
>TICs, many more than any other way.

I agree.

I apologize if my comments came across as criticisms of the PICTIC II
design.  My intention was to suggest possible alternatives and to
learn something in the discussion.




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