Nixie Tube Clock ‘Frank 2 IN-16’
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Insert IC4 directly into the PCB. Solder both components in place,
but do NOT insert IC3 at this stage. This will be inserted at the
very end of the assembly. Refer to figure 15.
4.12
R24-R29, C6, D6, Q15, Q16
The lead pitch of C6 may not match exactly the pitch of the holes
on the PCB. If so, bend the leads sufficiently to insert the
component. D6 needs to be placed the correct way round, so
ensure the black band on the component body aligns with the band
on the PCB marking.
4.13 Q3-Q8, Q9-Q14, R6-R23
This is perhaps the most time consuming stage of the assembly.
There are six anode driver clusters. The function of each is to take
the logic output from the 5V microcontroller, and switch on the
170V Anode drive to the respective nixie tube.
Pay particular attention to installing the correct transistor type
(MPSA42 or MPSA92) in the correct location.
4.14 Nixie tubes IN-16
To facilitate easy insertion of the flying leads into the small holes, it
helps enormously to trim the flying leads with a pair of scissors as
shown in figure 17. Start by identifying the anodes on the tubes as
shown in figure 16. It is the lead directly at the BACK of the tube,
and has a white coating where it enters the tube.
Figure 15: Socket
for IC3, and IC4
