Nixie Tube Clock ‘Halo Chroma’
Issue 1 (1 April 2021)
www.pvelectronics.co.uk
- 20 -
6.
PCB ASSEMBLY CONTINUED
6.1 R6, R7, R8, R9, R10, R11 (270 Ω)
6.2 Q5 – Q9 (MPSA42)
R12 (4.7 KΩ)
SYNC (Vertical Jack Socket)
LS1 (Piezo Buzzer)
C8 (0.22F)
The jack socket, piezo buzzer and C8 are mounted on the back of
the PCB. Ensure the arrows on C8 are aligned with the
corresponding arrows on the PCB
6.3 C9 (100nF)
Note this part is likely to be marked ‘104’.
6.4 D7 (5mm Green LED)
D6, D8 (5mm Yellow LED)
SET, ADJ, ALARM, DST (Push switches)
All these components are mounted on the back of the PCB. For the
four switches, you only need to actually solder the two pads of
each switch closest to the PCB edge. The other two pins / pads are
not used. It makes it easier in case you ever need to change a
switch.
The LEDs are polarized. The longer lead is the positive anode, and
goes into the hole that is marked with a + sign.
6.5 R22 – R25 (15 KΩ)
