Nixie Tube Clock ‘LTC’
Issue 1 (1 November 2011)
www.pvelectronics.co.uk
- 15 -
4.10
X1 - 32.768 KHz Crystal
C11, C12 (33 pF)
These are the timekeeping components: 32.768KHz crystal and two load
capacitors. See below:
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 6 X IN-18 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.
