Hmmm. Interesting! Thanks. This is the reason I always like to consult you guys. Someone always has a unique method or a different view.
Right now, on the first-off quickie prototype of this new pulse-remover, it's a 3-package solution. It uses a 4040 ripple counter, a 4073 triple 3-input AND gate, and one half of a 4013 D flip-flop. My first impression is that 3 packages is hard to beat. But I will kick around the idea of removing one pulse out of every 1008246 pulses. I did come up with a 6-package solution that's slightly more complex. Have not built it yet, but it has the addition of (2) hexadecimal rotary switches to use to set in the number of pulses to remove every hour. That number can be anywhere from 0 to 255 base ten. (FF hex) That configuration can slow a clock down by about 68 seconds per year max. That would pretty well cover the worst of the Maxim TCXOs. To go any more than that, a ninth bit would need to be decoded, and then up goes the package count. Or, the rotary switches could be assigned to the next higher order bits starting at N=2 instead of N=1, and then you'd have to play games figuring out how to set them! Not to mention that the resolution would then end up being to the nearest 2 pulses, not to the nearest single pulse. So, the 8-bit decoder using the switches is the next thing I will build and start testing. The first simple one is hardwired to decode 117 and to remove that many pulses. It's very simple, but changing that integer is a pain. Moving a few wires around is fine on a solderless board and during an experiment, but not on a final solution. ---- Original Message ---- From: [email protected] To: [email protected] Subject: Re: [neonixie-l] Dallas/Maxim TCXO Date: Wed, 25 Apr 2012 00:13:39 -0400 >> That number turns out to be 117 pulses to somehow remove >> every hour. > >You could attack it a different way, and skip one pulse after every >1008246. >Shouldn't be hard to implement, as that's just 2 * 3 * 197 * 853. >You could >instead skip one out of 1008247, but that happens to be a prime >number. > >- John > >-- >You received this message because you are subscribed to the Google >Groups "neonixie-l" group. >To post to this group, send an email to [email protected]. >To unsubscribe from this group, send email to >[email protected]. >For more options, visit this group at http://groups.google.com/group/ >neonixie-l?hl=en-GB. > $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 post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
