A while back I wanted to start making clocks using different numitron / minitron displays that are around and have been collecting them as time goes on .
I currently have 5 clocks made with 2 cased and the other three waiting to be cased .
The controller is a 328p PDIP and the RTC is a DS3231 and the digits are driven by 6C595 power shift registers that have open drain outputs . Displays are powered from a LiPo cell and the 328 / shift registers are powered from 5V .
The main thing to improve is adding time settings and extras as currently the code is very simple - displays the time .
Its all hand wired and solderd , No PCBs are used except for the 5V boost / Lipo charger
IV - 21 Numitron
P1010300 by TwirlyWhirly555, on Flickr
P1000235 by TwirlyWhirly555, on Flickr
IV - 13 Numitron .
001 by TwirlyWhirly555, on Flickr
005 by TwirlyWhirly555, on Flickr
This is the IV - 13 and a 4 digit mintron clock finsihed and cased .
002 by TwirlyWhirly555, on Flickr
IV-9 , case will be repaced to match the other two
IMG_1230[1] by TwirlyWhirly555, on Flickr
IMG_0975[1] by TwirlyWhirly555, on Flickr