Just for comparation, you have 120V/60Hz isn't it ? Have you an official info ( or a long time measurement ) how small is the main frequency drift ? For me sound's incredible... thank's Vasile On Thu, 22 Feb 2001, Bob Ammerman wrote: > In USA long term mains drift is _very_ close to zero. > > The power grid will deliberately adjust the mains frequency to compensate > for previous errors. > > Mains driven clocks keep good time nearly indefinitely (barring power > failure, which is very rare except for local problems due to storms, etc.) > [And California's problems due to stupidity :-) ]. > > Bob Ammerman > RAm Systems > (contract development of high performance, high function, low-level > software) > > ----- Original Message ----- > From: Vasile Surducan > To: > Sent: Thursday, February 22, 2001 3:26 AM > Subject: Re: [PIC] Timer Tribulations > > > > 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 > > > > -- > > 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 > > > > > > -- > 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 > > -- 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