Nixie Tube Clock ‘Halo’
Issue 3 (01 Nov 2018)
www.pvelectronics.co.uk
- 16 -
4.10
X1 - 32.768 KHz Crystal
C11 (33 pF)
C12 (15 pF)
These are the timekeeping components: 32.768KHz crystal and two load
capacitors. The capacitors in your kit may be blue, brown, or possibly
another colour. Look at the part markings, not the colour.
4.11
Tube Test
At this stage, it is desirable and possible to test that the tube drivers and
micro-controller are functioning correctly. Making the test at this point,
before the remaining components are installed will make troubleshooting
and diagnosis simpler if there is a problem.
Insert IC3 (PIC16F1936) and IC4, IC5 (both K155ID1) into their sockets.
Be very careful to align the notch on the IC body with corresponding PCB
markings.
Then insert the Nixie Tubes into the sockets.
Now power up the PCB, and the tubes should proceed to all count in
synchronisation from 0 to 9 repeatedly. If this does not happen, stop and
check your work carefully before proceeding.
