Thank you. I'll do it that way. On Saturday, October 17, 2015 at 9:26:23 AM UTC-4, Mitch wrote: > > Hi All, > > The seven digit, IN-18 board is on order so I'm on to the next project, a > fifteen digit Union Square Metronome type clock similar to Jarek's clock > here: > http://hackaday.com/tag/metronome/ > > Four HV5530s will be connected in series and updated every second, driving > twelve Nixies. That should not be a problem. One HV5530 will update two, > 1/10 second, and one, 1/100 second Nixie, updated at 10ms. > > All five will have the blanking lines connected together, to a PWM pin. > That leaves Data, Clock, and Latch, and only two extra level shifters are > available on the CD4054B. > > My thought is that only the latch line on the four HV5530s needs to be > separated from the latch line on the single, fifth HV5530 because even > though the data will be presented and clocked to all five HV5530s, if it is > never latched and subsequently replaced with it's correct data, incorrect > data will never latch to the wrong display. > > With two available level shifters and pins available on the 1284P, clock > and latch could be separated, but I'm not sure if separating the clock line > too, will make a difference. > > Please give me advice on this. > > By the way, the cost estimate for the seven digit, IN-18 board from OSH > Park was just over $210 for three boards, with shipping. I decided to try > PCBWay this time because their estimate was $70 with DHL shipping for five > boards. > > Thanks. > > > > >
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