Nixie Tube Clock ‘Halo’
Issue 3 (01 Nov 2018)
www.pvelectronics.co.uk
- 20 -
5.
OPTIONAL COMPONENTS
5.1 GPS Input Components
If you will be using a GPS time receiver module, install the following
components:
GPS / RFT Connector (if you didn't already install it in step 4.12)
C13 (100nF)
D4 (Green LED)
5.2 Tube Underlighting Pack
Q14 - 2N7000
R31 – R36 (all 270Ω)
D6A - D11C (18 X 1206 size SMD LEDs)
Three 1206 LEDs per tube provide attractive tube underlighting. Start by
installing Q14 and the six 270R resistors.
The procedure for installing the LEDs is the same for all six tube locations.
First, identify the white cathode marks on the PCB as shown below: