In Ukraine these clocks just don't work correctly. Currently we have the mains frequency at about 49.3 Hz, and if you assume the frequency is 50 Hz... :) Nikolai ---- Original Message ---- From: Tony Nixon Sent: Thursday, February 22, 2001 23:49:33 To: PICLIST@MITVMA.MIT.EDU Subj: [OT]: Re: [PIC] Timer Tribulations > Vasile Surducan wrote: >> >> On Wed, 21 Feb 2001, Tony Nixon wrote: >> >> > You will find that the clock will drift one way or the other depending >> > on temperature, so using the mains as a frequency source is much more >> > accurate. >> >> You are certainly joking ! Or in your country mains frequency drift is >> under 0.5% ... >> >> Vasile >> > Perhaps a bit of AC math about power consumption in a system as large as > a state grid may reveal why power companies try to keep the frequency as > stable as possible. > I'm definitely no expert here, but I'll bet it is definitely in the > power company's best interest. > Upteen million clocks around the world wouldn't be using the principle > if it was unreliable. > -- > Best regards > Tony > mICro's > http://www.picnpoke.com > mailto:sales@picnpoke.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics