logo
navigationGo.pngQuick Navigation
allprojects32.pngAll projects
hardware32.pngHardware
links32.pngLinks

favoriteStar32.pngTop projects
Alan numitron clock
Clapclap 2313/1386
SNES Pi Webserver
USB Volume/USB toys
Smokey amp
Laser cutter
WordClock
ardReveil v3
SNES Arcade cabinet
Game boy projects
cameleon
Home Presence Detector

github32.pngGitHub
AlanFromJapan

navigationMail.pngContact me

alanfjmail.png
3flags.pngWho's Alan?


Akizukidenshi
Elec-lab
Rand Nerd Tut
EEVblog
SpritesMods
Switch-science
Sparkfun
Suzusho
Datasheet Lib
Reddit Elec
Ermicro
Carnet du maker (fr)
Marutsu
ATmel blog (defunct)

alan numitron clock iv6


README: this is the same board as the Alan numitron clock but with changes on the tubes board to host some Numitron IV6 tubes, and some additional parts to generate the high and low voltage needed.

Presentation

Principle

A clock using the low voltages Numitron IV6 tubes. They need 2 voltages, ~1v and ~20v to shine with all their blue power. So need to generate those voltages too: the high one via those inexpensive voltage boost converter of eBay, the low one with a voltage divider.
I'll also use the occasion to use those addressable WS2812B Leds that are everywhere on internet: much less hardware hassle, it goes to the mCU. And since it was busy doing nothing, that shouldn't be a problem.

Points of interrest

  • Usage of Numitron IV6
  • Sink-side driving the tubes 20v with a combo of ULN2803 (NPN darlinton array) and 74xx595 (SIPO)
  • Play with thoses WS2812B leds
  • My first blue board
  • Schematics

    Bill of materials

    Mandatory:
  • Numitron tubes IV6 x4
  • 74xx595 SIPO SMD x4
  • ULN2803 driver SMD SOIC18 x4
  • Capacitor 1uF SMD1206 x1
  • Capacitor 22uF SMD x1
  • Some way to make 20~30v for the IV6 tubes
  • Optional:
  • WS2812B RGB led with 1wire x4
  • Resitor 470ohm SMD1206 x2 (for the colon in the middle)
  • Led for colon x2
  • Implementation

    Source code

    Pictures


    The board as of Eagle

    And the result from Seeedstudio

    Links

    Helpful sources

    Voltage boost to 30v

    Inspiration

  • that circuit on ebay
  • All content on this site is shared under the MIT licence (do what u want, don't sue me, hat tip appreciated)
    electrogeek.cc ~ Formerly known as Kalshagar.wikispaces.com (AlanFromJapan [2009 - 2017])