Let us not forget the Dallas/Maxim DS32KHZN/DIP TXCO. That puts out a fairly accurate 32.768 kHz, guaranteed within +/- 2 ppm.
For much greater accuracy, I've devised a programmable "pulse-remover" which shaves off a predetermined amount of pulses each hour. This, because every one of those TCXOs I've encountered tends to run a bit fast. I've got the remover removing 110 pulses per hour in one clock right now, and it's been free-running since Oct. 17, 2013, and presently at this time, it's lost about half a second. Not bad for 5 months free-running. Chuck > > >---- Original Message ---- >From: [email protected] >To: [email protected] >Subject: Re: [neonixie-l] Erratic Harrison clock >Date: Mon, 17 Mar 2014 08:12:54 -0700 (PDT) > >>On Monday, 17 March 2014 14:35:21 UTC, Adam Jacobs wrote: >>> >>> I can tell you that if you want to advance one of these clocks in >your >>> house hours at a time by remote control, all you need to do is >work some CW >>> in the basement. :D >>> >> >>Now that the mains (in the UK at least) has no guaranteed long-term >>accuracy (UK does not subscribe to UCTE), it makes far more sense to >use a >>4060 & a 32,768Hz watch xtal - that gives you a 2Hz output that you >can use >>a latch to divide by two to 1Hz - much more reliable... or to use a >DS3231 >>for even greater accuracy... >> >>I spoke to mike about this clock some years back at a UK Teslathon - >that's >>when he commented about not doing a design like this nowadays - he's >a >>serious professional engineer (have you seen his massive >polychromatic UFO >>flying over Rio de Janeiro & Gdansk? >>http://www.dezeen.com/2008/07/15/ufo-by-peter-coffin-and-cinimod-stu >dio/) >> >>Nick >> >>-- >>You received this message because you are subscribed to the Google >Groups "neonixie-l" group. >>To unsubscribe from this group and stop receiving emails from it, >send an email to [email protected]. >>To post to this group, send an email to [email protected]. >>To view this discussion on the web, visit >https://groups.google.com/d/msgid/neonixie-l/6f7dda5b-f121-4e41-a673- >d352acfefa3d%40googlegroups.com. >>For more options, visit https://groups.google.com/d/optout. >> $4.95/mo. National Dialup, Anti-Spam, Anti-Virus, 5mb personal web space. 5x faster dialup for only $9.95/mo. No contracts, No fees, No Kidding! See http://www.All2Easy.net for more details! -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/380-220143117154633930%40all2easy.net. For more options, visit https://groups.google.com/d/optout.
