2 tube B-7971 clock almost complete
- It might seem strange to only use two tubes, but my original 2 tube
nixie clock has always been well received.
I've re-written the code to operate two smart sockets
There are many adjustable parameters for the clock, it makes full use
of font and effect and speed selection.
The displays routine is editable, the hours can be shown for between
1-5 seconds, the minutes shown for between 1-5 seconds, and the
seconds and an intercycle blanking period can be set to between 0-5
There is an alarm and a programmable night-time blanking command.
The user interface is a good quality rotary encoder and the settings
are selected via a menu system....whereas in my nixie tube version
the menus were selected by their menu numbers, I've used a scrolling
word system with this B-7971 version, because that's what these tubes
can do !
There is an adjustment feature to enable the timing to be fine tuned
to take into consideration the way temperature and ageing effects
affect the accuracy of the 4MHz crystal timebase, making it possible
to have excellent long term timing accuracy.
The clock chip circuit is very simple, I am considering having some
small PCB's made but the circuit will be able to be built quickly and
run reliably on a small piece of pcb prototyping board.
I will probably offer a few sets of 2-tube sockets and a clock chip
for sale soon.