[time-nuts] TVB-DIV
Brooke Clarke
brooke at pacific.net
Fri Aug 4 15:10:55 UTC 2006
Hi Christopher:
I made up some prototype boards and have a couple of them out for beta
testing, see:
http://www.pacificsites.com/~brooke/PRC68COM.shtml#TVB
There's been an issue with the SYNC function that depends on the source
impedance of the 1 PPS.
It seems that some sources are "weak" and can not drive a 50 Ohm load so
the input load resistor needs to be selected.
My current project is a PIC based "precision clock" that uses a
frequency standard as the external oscillator input. I've been working
on versions of this for a number of years. For the current version
see: http://www.pacificsites.com/~brooke/PRC68COM.shtml#PC3 and
scroll down for a photo. I've got the leap year calculations working
for Year/4, Year/100 and Year/400 and almost have Zeller's Congruence
working for the Day of the Week. These are to replace the Microchip
TB028 Day of the Week method that has a limited range.
Have Fun,
Brooke Clarke
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Christopher Hoover wrote:
>Tom Van Baak wrote:
>
>
>
>>>TVB-DIV is a frequency divider, designed by TVB,
>>>
>>>
>>Quite a few people have used it over the years.
>>The free source code is at:
>>
>>http://www.leapsecond.com/tools/ppsdiv.zip
>>
>>
>>
>
>Are people just building these up ugly style, or is there a board design
>floating about?
>
>-ch
>
>
>_______________________________________________
>time-nuts mailing list
>time-nuts at febo.com
>https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
>
More information about the Time-nuts_lists.febo.com
mailing list