On the 12/24 selectable version of the '160 clock, when it is in 12-hour mode, the thumbwheels must be left preset for 0100.
Then, as David said, it loads that after 12:59:59 Chuck > > >---- Original Message ---- >From: dfor...@dakotacom.net >To: neonixie-l@googlegroups.com >Subject: Re: [neonixie-l] Re: Design my own Nixie Clock? >Date: Wed, 15 Aug 2012 11:22:37 -0700 > >>On 8/15/2012 11:18 AM, John Rehwinkel wrote: >>>> A couple of years ago just for fun I started from >>>> scratch and designed a nixie clock circuit from the >>>> ground up (pun intended), that uses (6) 74HC160 counters. >>> >>> How do you do the divide-by-6 digits? Just use gates to reset the >counters >>> when they get to 6? I'm more used to using 7492 counters for that >task, so >>> I'm curious. >>> >>> - John >>> >> >>Synchronous counters will accept a parallel data input and/or a >reset signal. >>The tricky part is going from 12 to 01. You have to issue a load >command with >>0001 on the data bus to set it to 1. >> >>The '160 has an asynchronous reset, while the '162 has a synchronous >reset. So >>the logic would be slightly different for those two parts. >> >>The advantage of synchronous counters is that you don't get >glitches, and if you >>do, they don't matter since the signals are only sampled on the >rising edge of >>the clock. >> >>It's not so important for a time-of-day clock, but designing >circuits to work at >>a hundred MHz is a lot easier with synchronous logic. >> >>-- >>David Forbes, Tucson, AZ >> >>-- >>You received this message because you are subscribed to the Google >Groups "neonixie-l" group. >>To post to this group, send an email to neonixie-l@googlegroups.com. >>To unsubscribe from this group, send email to >neonixie-l+unsubscr...@googlegroups.com. >>For more options, visit https://groups.google.com/groups/opt_out. >> >> >> $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 neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
