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Nixie clock

alx-alexpark·nixie-clock

Nixie clock PCB layout, top view — open source RP2040/RP2350 board by alx-alexpark

About the Nixie clock PCB

Nixie clock is an open source RP2040/RP2350 PCB design by alx-alexpark, published on GitHub. It is a 2-layer board measuring 168.8 × 95.8 mm, with 73 components from 41 distinct parts.

Its main chip is the PicoW, from the RP2040/RP2350 family. Other key parts include the UCC3803, K155NA1 and EL817S1(C)(TU)-F. By type, the board carries 22 resistors, 19 capacitors, 9 ICs, 9 diodes, 3 transistors and 3 inductors.

It belongs with the displays & leds designs in this gallery.

From the project

ИН-12 Nixie Tube Clock built with Pico W and k155id1

A nixie tube clock made using ИН-12 (IN-12) tubes. Uses k155id1 drivers and a boost converter made using this reference design. Time is synchronized over WiFi using NTP (<1sec inaccuracy), and all firmware is written using CircuitPython.

Read more at https://parkalex.dev/posts/nixieclock

Nixie clock, from the project README
From the project README

Main components on the Nixie clock

UCC3803K155NA1PicoWEL817S1(C)(TU)-F

Nixie clock bill of materials (BOM)

73 components, 41 distinct parts.

QtyPartRefs
1
UCC3803
U1
6
K155NA1
U2, U4, U5, U6, U7, U8
1
PicoW
U3
1
EL817S1(C)(TU)-F
U9
1
MMBTA42
Q1
1
FDS2672CT-ND
FDS2672CT
Q2
1
SS8050
Q4
1
MF-MSMF110-2
1.1A/2.2A
F1
6
IN-12A
NX1, NX2, NX3, NX4, NX5, NX6
1
TestPoint_Probe
TP2
1
BAT54WS-7-F
BAT54
D1
1
ES1D
D2
1
Green LED
D3
2
RED
D4, D5
3
PESD5V5C1BLYL
D6, D7, D8
1
SM2T3V3A
D9
2
MH2029-600Y
60ohm 100Mhz
L1, L3
1
7447709330
33uH
L2
1
47uF 16v
C1
2
100uF 16v
C2, C7
Show 21 more
QtyPartRefs
1
0.1uF
C3
1
220pF
C4
1
430pF
C5
6
0.1uF 16v
C6, C15, C16, C17, C18, C20
1
1nF
C8
1
560pF 250v
C9
1
100pF 250v
C10
2
1uF 250v
C11, C12
2
0.1uF 250v
C13, C14
6
10.5k
R1, R14, R15, R16, R17, R18
2
100k
R2, R4
1
2k
R3
1
60.4k
R5
1
0 Ohm
R7
1
4.12k
R8
4
1k
R9, R13, R19, R21
1
0.1 1/2W
R10
1
634k
R11
1
7.68k
R12
2
140
R20, R22
1
330
R23

Nixie clock design files

The KiCad project lives in the alx-alexpark/nixie-clock repository on GitHub; these links point at the commit this page was built from.

Nixie clock: common questions

What microcontroller does the Nixie clock use?

The Nixie clock is built around the PicoW, from the RP2040/RP2350 family.

How big is the Nixie clock PCB?

The Nixie clock measures 168.8 × 95.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Nixie clock?

73 components, from 41 distinct parts. The full bill of materials is listed on this page.

Where can I download the Nixie clock design files?

From the alx-alexpark/nixie-clock repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Nixie clock design in my own project?

The repository has no license, so all rights stay with alx-alexpark. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Nixie clock without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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