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CNIX V2 Tube Board

Stustup·C-Nixie_CNIX·Hardware/Tube Board/CNIX V2 Tube Board/CNIX V2 Tube Board.kicad_pcb

CNIX V2 Tube Board layout, top view — open source STM32 board by Stustup

About the CNIX V2 Tube Board

CNIX V2 Tube Board is an open source STM32 PCB design by Stustup, published on GitHub. It is a 2-layer board measuring 185 × 51 mm, with 49 components from 22 distinct parts.

Its main chip is the STM32G051C8T3, from the STM32 family. Other key parts include the AMS1117-3.3, SN75468, 4028, IN-4_0 and IN-4_1. By type, the board carries 14 ICs, 14 diodes, 12 resistors, 5 connectors and 4 capacitors.

It belongs with the displays & leds, power & battery and sensors designs in this gallery.

From the project

Nixie Tube Clock with flexible tube driver

CNIX is a nixie tube clock which accepts many diffrent nixie tubes with only slight modifications to the tube carrier board.

The motivation was, that there are not many clocks out there that let you use almost any nixie tube you like. Most have fixed power supplies, underdesigned driver stages or inflexible microcontrollers. I hope to tackle these problems with an adjustable boost converter PSU, extremely flexible (and electrically protected) driver stages and an open source firmware written with free tools.

Main components on the CNIX V2 Tube Board

STM32G051C8T3AMS1117-3.3SN754684028IN-4_0IN-4_1IN-4_2IN-4_3

CNIX V2 Tube Board bill of materials (BOM)

49 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32G051C8T3
SN75468
U1
1
AMS1117-3.3
SN75468
U2
4
SN75468
U3, U4, U5, U14
4
4028
U6, U7, U8, U9
1
IN-4_0
U10
1
IN-4_1
U11
1
IN-4_2
U12
1
IN-4_3
U13
1
VDD
J1
1
GND
J2
1
Tube Conn
J3
1
LED
J4
1
I2C_EXT
HT
J5
12
TZMC47
D1, D2, D3, D4, D5, D6, D7, D8 +4
2
LED_Y
D11, D12
2
18P
100n
C1, C3
2
100N
100n
C2, C4
1
10K
47k
R1
2
47k
R2, R3
3
4K7
47k
R4, R5, R12
Show 2 more
QtyPartRefs
4
4K7
18k7
R6, R7, R8, R9
2
4K7
4k7
R10, R11

CNIX V2 Tube Board design files

The KiCad project lives in the Stustup/C-Nixie_CNIX repository on GitHub; these links point at the commit this page was built from.

CNIX V2 Tube Board: common questions

What microcontroller does the CNIX V2 Tube Board use?

The CNIX V2 Tube Board is built around the STM32G051C8T3, from the STM32 family.

How big is the CNIX V2 Tube Board?

The CNIX V2 Tube Board measures 185 × 51 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the CNIX V2 Tube Board?

49 components, from 22 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the CNIX V2 Tube Board design files?

From the Stustup/C-Nixie_CNIX repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the CNIX V2 Tube Board design in my own project?

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

Can I test firmware for the CNIX V2 Tube Board without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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