2 layers41.9 × 45.8 mm
NixieClock Display 1.8
JakobThiessen/NixieClock
Wichtig: Ohne Änderung tut die SD karte nicht. (Betrifft nur V2.0 in der V2.1 sind die Änderung im Layout schon umgesetzt)
2 parts
2 layers152.4 × 63.5 mm
NixieClock MainBoard
JakobThiessen/NixieClockWichtig: Ohne Änderung tut die SD karte nicht. (Betrifft nur V2.0 in der V2.1 sind die Änderung im Layout schon umgesetzt)
- Size
- 152.4 × 63.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 111
- Nets
- 128
- Pads
- 492
- Tracks, vias
- 1,053, 261
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 20 Jun 2024
- Updated
- 11 Jun 2026
Overview
NixieClock MainBoard is an open-source printed circuit board by JakobThiessen, from the JakobThiessen/NixieClock repository on GitHub. It is a 2-layer board of 152.4 × 63.5 mm with 111 parts on 128 nets, routed with 1,053 tracks and 261 vias.
It is built around the NC7SZ125M5X, CH340C and ESP32-WROOM-32E, with the R-78C3.3-1.0, PCA9538ABS and PCA9635PW among its other parts. Its parts include 35 resistors, 30 capacitors, 21 ICs, 13 connectors and 4 transistors. It belongs with the computers and single-board computers boards and the ESP32 boards of this library.
Main components
9
NC7SZ125M5X
SOT-23-5-40℃~+85℃ 1 1 1.65V~5.5V 2.6ns@5V,50pF 20uA 32mA 32mA 7SZ Tri-State Unidirectional SOT-23-5 Buffers, Drivers, Receivers, Transceivers ROHSonsemiBuffers, Drivers, Receivers, Transceivers
CH340C
SOP-16-20℃~+70℃ 2Mbps 3.3V、5V 50uA 7mA Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
ESP32-WROOM-32E
SMD,18x25.5mmSMD,18x25.5mm WiFi Modules ROHSEspressif SystemsWiFi Modules
R-78C3.3-1.0
SIP-3-40℃~+85℃ 1 10.4mm 11.6mm 1A 1mA 3.3V 30mVp-p、75mVp-p 350kHz 470uF、6800uF 7V~42V 8.5mm 89% Buck-Boost Short Circuit Protection、Over-temperature protection、Automatic fault recovery ±3% SIP-3 DC-DC Power Modules ROHSRECOM PowerDC-DC Power Modules
PCA9538ABS
-Reset function、Cascading and address extension、Built-in LED driver - I/O Expanders ROHSNXP SemiconductorsI/O Expanders
PCA9635PW
TSSOP-28-40℃~+85℃ 100kHz~1MHz 16 2.3V~5.5V 25mA 5.5V Built-in PWM TSSOP-28 LED Drivers ROHSNXP SemiconductorsLED Drivers
BC847
SOT-231 NPN 100MHz 100mA 100nA 110 200mW 45V 500mV 6V NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)BSS123
SOT-23-55℃~+150℃ 1 N-channel 1.4V 1.4nC@10V 100V 170mA 22pF 2pF 3.5pF 680mW 6Ω@10V、10Ω@4.5V N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsSI2319CDS
SOT-23-55℃~+150℃ 1 P-Channel 108mΩ@4.5V 2.5V 2.5W 21nC@10V 4.4A 40V 595pF 61pF 76pF P-Channel SOT-23 MOSFETs ROHSVishay IntertechnologyMOSFETs
README
README.mdNixieClock
Hardware
Wichtig: Ohne Änderung tut die SD karte nicht. (Betrifft nur V2.0 in der V2.1 sind die Änderung im Layout schon umgesetzt)
Display 1.14"
| Top side | Bottom side |
|---|---|
 |  |
Display 1.8"
| Top side | Bottom side |
|---|---|
 |  |
Parts
111| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C3, C5, C7, C11, C12, C14, C16, C18, C19, C20, C21, C22, C23, C29, C30 +1 |
| 16 | 10k | Resistor_SMD:R_0603_1608Metric | R5, R6, R9, R10, R11, R12, R22, R24, R25, R26, R27, R29, R31, R32, R33, R34 |
| 15 | NC7SZ125M5X | Package_TO_SOT_SMD:SOT-23-5 | U3, U5, U7, U8, U9, U10, U11, U12, U13, U16, U17, U18, U19, U20, U21 |
| 13 | 1u0 | Capacitor_SMD:C_0603_1608Metric | C2, C4, C6, C8, C10, C13, C15, C17, C24, C25, C26, C27, C28 |
| 10 | 10R | Resistor_SMD:R_0603_1608Metric | R7, R8, R13, R14, R15, R16, R17, R18, R19, R20 |
| 7 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5, H6, H7 |
| 4 | Conn_01x08 | Connector_PinSocket_1.27mm:PinSocket_1x08_P1.27mm_Vertical | J2, J3, J4, J5 |
| 3 | 12k | Resistor_SMD:R_0603_1608Metric | R3, R4, R23 |
| 2 | 470R | Resistor_SMD:R_0603_1608Metric | R28, R30 |
| 2 | 5k1 | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | BC847 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J9, J12 |
| 1 | 0R0 | Resistor_SMD:R_0603_1608Metric | R21 |
| 1 | BSS123 | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U15 |
| 1 | CP2102N-Axx-xQFN24 | Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U14 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J13 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J10 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical_SMD_Pin1Left | J11 |
| 1 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J8 |
| 1 | Conn_01x14 | Connector_PinSocket_1.27mm:PinSocket_1x14_P1.27mm_Vertical | J1 |
| 1 | ESP32-WROOM-32E | RF_Module:ESP32-WROOM-32D | U1 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Hirose_DM3D-SF | J7 |
| 1 | PCA9538A | Package_DFN_QFN:HVQFN-16-1EP_3x3mm_P0.5mm_EP1.5x1.5mm | U6 |
| 1 | PCA9635 | Package_SO:TSSOP-28_4.4x9.7mm_P0.65mm | U4 |
| 1 | R | Resistor_SMD:R_0603_1608Metric | R35 |
| 1 | R-78C3.3-1.0 | Converter_DCDC:Converter_DCDC_RECOM_R-78E-0.5_THT | U2 |
| 1 | Si2319CDS | Package_TO_SOT_SMD:SOT-23 | Q4 |
| 1 | SolderJumper_3_Open | Jumper:SolderJumper-3_P1.3mm_Open_Pad1.0x1.5mm | JP1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4110 | J6 |
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Wichtig: Ohne Änderung tut die SD karte nicht. (Betrifft nur V2.0 in der V2.1 sind die Änderung im Layout schon umgesetzt)
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Questions
How big is the NixieClock MainBoard PCB?
It measures 152.4 × 63.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the NixieClock MainBoard use?
111 parts, built around the NC7SZ125M5X, CH340C, ESP32-WROOM-32E and R-78C3.3-1.0. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the NixieClock MainBoard KiCad files?
From the JakobThiessen/NixieClock repository on GitHub, at the commit this page was made from: the board is hardware/NixieClock_MainBoard/NixieClock_MainBoard.kicad_pcb and its schematic hardware/NixieClock_Display_1.14/NixieClock_Display_1.14.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the NixieClock MainBoard design in my own project?
Its repository states no licence, so its author keeps all rights: ask JakobThiessen before reusing the design.