In message <[EMAIL PROTECTED]>, "Tom Van Baak" writes: >You know, if the stackable TAPR module >project catches on another PCB on the list >could be a mains frequency monitor. > >It would robustly filter and divide the 50/60 Hz >mains frequency to 1 PPS and then onboard >compare that 1 PPS against the local (OCXO, >atomic, or GPS) 1 PPS to a modest precision >(say, 1 or 10 us).
I actually wrote one in a Z80 many years ago: It would measure the period of 50 mains cycles (ie: 1 second) calculate the reciprocal and display frequency with 4 decimals. Do it on a PIC18F* and feed it a 10MHz atomic clock and you are done. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
