HV5122/Nixie Driver high speed alternative ? - Page 1
Forum section: electronics / beginners

author: IamSynthetiC
author_rank: Regular Contributor
timestamp: January 21, 2021, 05:02:00 pm
content: Greetings,I am planning on building a Nixie Tube precision clock, accuratre down to the milisecond, but the speed and bandwith required to drive the nixies troubles me a bit. I was originaly planning to use 3xHV5122 32-bit shift registers to control the Nixie Tubes (each controlling 3 tubes), but their maximum clock speed is 8MHz which is not enough to update the "display" every milisecond. Are there any high speed alternatives for nixies ?Thank you in advance.

author: reboots
author_rank: Regular Contributor
timestamp: January 21, 2021, 06:01:13 pm
content: IamSynthetiC, if my calculations are correct, shifting 96 bits through three HV5122s at 8MHz would allow you to update the entire display around80 timesper millisecond. What am I missing?

author: IamSynthetiC
author_rank: Regular Contributor
timestamp: January 21, 2021, 06:41:06 pm
content: I have been thinking this was a simple problem, and there should be a simple solution, for a while now but i couldn't find it. All this time i had confused Mhz with kHzfollowup question. Can i delete a post ? And do you know of a good hole in the earth i can hide for a while ?

author: Ian.M
author_rank: Super Contributor
timestamp: January 21, 2021, 07:32:26 pm
content: You cant delete the first post in a thread with replies, and retroactively censoring yourself just makes you look even more stupid. Do it too often and you will become notorious to the point that you get discussed in the moderation reports thread!You are only out by three orders of magnitude and found your error before building hardware, so IMHO you should 'own' your mistake. We've all been there and done that. Anyone who says they haven't is either a liar or was born clutching a pocket protector!

author: schmitt trigger
author_rank: Super Contributor
timestamp: January 21, 2021, 07:44:00 pm
content: That is correct. Everybody has made mistakes, at least once.I know I have. Several times.Learn from the error and move on.

author: Gyro
author_rank: Super Contributor
timestamp: January 21, 2021, 08:20:01 pm
content: Quote from: IamSynthetiC on January 21, 2021, 06:41:06 pmOne of the advantages (and frustrations, given its search capabilities) of this forum is that it receives so many posts that anything that stops getting replies quickly sinks into the ground. Quicker than you could dig a hole for yourself.If you want, you could maybe go back to your original post and edit the title to add a '(solved)' on the end, but I really wouldn't worry. There was a case the other day of one being out by six orders of magnitude.

author: Skashkash
author_rank: Regular Contributor
timestamp: January 21, 2021, 10:03:19 pm
content: Dalibor has a good video on updating nixies at high speeds.May be useful.

author: wizard69
author_rank: Super Contributor
timestamp: January 21, 2021, 10:12:38 pm
content: I have to agree with others here, never be embarrassed by mistakes.I do wonder what is the point in having a millisecond display on a clock. Unless the clock has other functions or you have visual perception beyond the norm, will you even be able to see an update that doesn't happen every millisecond?

author: IamSynthetiC
author_rank: Regular Contributor
timestamp: January 21, 2021, 10:41:12 pm
content: Thank you all. I undertand that mistakes always happen in life, but I can't help but feel embarased making such silly mistakes.Nevertheless, all mistakes hide a lesson, and i think mine is "the pen is mightier than my brain"Quote from: wizard69 on January 21, 2021, 10:12:38 pmThe clock is going to have a GPS-DO with an accuracy of 10^-9 when synced to a satellite and 10^-(6~7) when it is not. So, overkill being the word of the day, i decided on milliseconds. In all seriousness though, the nixies will also display data gathered from a plethora of onboard sensors (Temprature, Humidity, Pressure, Oxygen, Carbon Dioxide & Monoxide and an odour sensor).