Nixie Tube Clock ‘Halo’
Issue 3 (01 Nov 2018)
www.pvelectronics.co.uk
- 19 -
4.14
Microcontroller Tube Selection
The Microcontroller IC3 needs to be setup for your PCB type as the tube
connections differ for the 2 types of PCB (ZM1020 / Z560M or IN-4). The
controller is by default set to the ZM1020/ Z560M configuration. If you
are using this PCB then omit this following step.
For IN-4 boards, proceed as follows. disconnect the power, remove and
re-insert IC3 into its socket. Now, press and hold the 'ADJ' button and
whilst it is held, re-connect the power supply. IC3 will now be re-
configured for IN-4 PCB, and the setting will be retained in flash memory.
If for some reason you need to reverse this, you can do so by repeating
the above procedure, which will re-configure the IC for the ZM1020 /
Z560M PCB. Each time you follow this procedure, the IC will toggle
between the two configurations.