Colon Leds; Final Assembly - Nixie Clock ITS1A Manual

Next repeat this sequence at the other end of the display board. Now insert all of the rest of the tubes,
leaving them unsoldered.
Now you will want to try and get them as square as you can. This will take some trial and error. Here is
one suggested sequence:
1. Lay the assembly down on your work surface as in the picture below.
2. Adjust the two tubes on the ends until the board is level with the display surface. You could
make a jig to do this by cutting small pieces of material such as wood to hold the PCB at the
same height on all sides, or you could just keep re-soldering and measuring.
3. Once you are happy that the two end tubes are square and the PCB is level with the work
surface, adjust the remaining tubes and tack them in place with by soldering a single lead.
4. Eyeball the results. Do the tubes line up properly? If not, repeat the above steps.
5. When everything looks OK. Solder another lead in place opposite the previous lead. Check again.
6. If everything is still OK. Do another lead. Etc. etc.
7. Trim the leads flush with the back of the PCB!

Colon LEDs

LEDs are polarized components. The anode hole on the display board is marked with a little '+' symbol.
The long lead of the LED will go in this hole.
Decide how far in you want to insert the LEDs, then solder them in place. At first, just solder one lead so
it is easy to rectify any mistakes.

Final Assembly

Final Assembly
Insert IC1 into its socket. For some reason that I will never understand, the pins on an IC never line up
with the holes in the socket. You will need to bend them slightly. Use whatever method you are
ITS1A CLOCK
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