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New Precise Nixie Clock

A GPS synchronized clock with seconds display

Based on a Labs project | August 2015 | Find it here
New Precise Nixie Clock
As mentioned in the introduction to the earlier Precise Nixie Clock project, the New Precise Nixie Clock combines modern and legacy technologies. The clock receives time signals from the GPS system and displays the time with six Nixie tubes. And this model also shows the seconds.
Relevant websites
Extra info / Update
GPS synchronized
Full time display including seconds
Internal reference clock bridges GPS signal dropouts
Automatic switching between summer and winter time
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
Component List
Default: 5%, 250 mW
R1,R2,R4,R5,R6,R7,R9,R10,R11,R14,R15,R18,R19,R20,R21,R22,R25,R26 = 10kOhm
R3,R13,R24 = 470kOhm
R8,R23 = 3.3kOhm
R12 = 1kOhm
R16 = 150Ohm
R17 = 5.6kOhm
P1 = 500kOhm preset
C1 = 2.2µF, 50V, 2mm lead pitch
C2,C4,C5,C6,C7,C13–C17 = 100nF, 50V, 20%
C3 = 470pF, 50V, Y5P, 2.5mm lead pitch
C8,C9 = 22pF, 50V, C0G/NP0, 2.5mm lead pitch
C10 = 10µF, 250V, 20%, radial, 5mm lead pitch
C11,C12 = 100µF, 50V, 3.5mm lead pitch
L1 = 330µH, 900mA, radial, 10x15mm
D1 = BYV26
D2 = 1N4007
LED1 = LED, flat head, red, 3mm
T1,T2,T3,T4,T8 = MPSA42
T5 = IRF820
T6,T7 = 2N7000
IC1,IC2,IC3,IC8,IC9 = K155ID1 (74141)
IC4 = PIC18F4420, programmed, Elektor Store # 150189-41
IC5 = LP2950
IC6 = 7805
IC7 = MC34063
JP1 = 2-pin pinheader
K1 = 6-pin pinheader, 0.1’’ pitch
K2 = 2-way PCB screw terminal block 0.2’’ pitch
K3,K5,K7,K9,K11,K13 = 10-way (2x5) pinheader receptacle, vertical
K4,K6,K8,K10,K12,K14 = 10-way (2x5) pinheader, right angled
LA1,LA2 = neon lamp, wired, T1.1/4
MOD1 = A2035H GPS module with internal antenna
S1 = SPDT rocker switch, 20V, 0.4VA
V1–V6 = IN-12 Nixie-tube
X1 = 22.1184MHz quartz crystal
Jumpers for JP1
PCB no. 150189-1 V1.1 (Elektor Store)
DC-connector for in-case mounting: PC-010 (www.tme.eu/en/details/pc-010/dc-power-connectors)

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