Nixie Clock ITS1A, Manual

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4
ITS1A CLOCK
Safety
This is a kit of parts, not a finished item. The person assembling this kit must be familiar with the design
of these specific PCBs and with the assembly of electronics in general, including but not limited to: being
able to identify components, their location on the board and being qualified in the use of assembly
equipment such as soldering irons and other tools and being able to determine the correct and safe
functioning of this kit.
Any ‘instructions’ provided with this kit are guidelines only, and the assembler must be qu alified to
determine the correctness, or not, of those instructions. If they have any concerns about the correct
functioning of the kit once assembled, they must cease all work and proceed no further.
No case is provided with this kit, the assembler must provide their own case.
The completed PCB (ITS1A Clock Kit) generates voltage differences of up to 450V between certain parts
of the PCB. THESE VOLTAGES MAY BE LETHAL. Therefore assembly should only be undertaken by people
qualified to work with these voltages, and who can guarantee that the completed product meets all
local safety requirements and certifications during operation. Furthermore, the finished article must be
in a casing that isolates people from access to these voltages during operation.
Certain parts of the PCB may maintain high voltage after it is unplugged from a power source, therefore
care must be taken to ensure that these voltages are not present prior to accessing the contents of the
case.
Introduction
Read through all of these instructions before starting. If, after doing so, you are not sure about your
ability to safely assemble this board, stop now.
Check that you have all the parts listed in the Bill of Materials.
Bill of Materials
Main Board
D1-D18 18 DIODE GEN PURP 100V 200MA DO35
Z1 1 DIODE ZENER 3.2A 39V DO35
Z2, Z5 2 DIODE ZENER 100V 500MW DO35
Z3, Z4 - 2% 1 DIODE ZENER 75V 500MW DO35
R4 1 RES 12K OHM 1/4W 5% CF MINI
R2 1 RES 180 OHM 1/2W 5% CF MINI
R8 1 RES 6.2K OHM 1/4W 5% CF MINI
R7 1 RES 3.9K OHM 1/4W 5% CF MINI
R3, R1 2 RES 470K OHM 1/4W 5% CF MINI
R6, R17, R18 3 RES 1 OHM 1/8W 5% CF AXIAL
R5, R13, R14 3 RES 10K OHM 1/4W 5% CF MINI
R11, R12 2 RES 100K OHM 1/4W 5% CF MINI
R10, R15, R16 3 RES 1M OHM 1/4W 5% CF MINI
R9 1 RES 10M OHM 1/8W 5% CF AXIAL