4 layers160 × 185.5 mm
2 layers160 × 100 mm
ClockV2 1
Raphael-Tibbits/ClockV2Crystal oscilator clock project
- Size
- 160 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 107
- Pads
- 296
- Tracks, vias
- 464, 36
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 Oct 2025
- Updated
- 25 Oct 2026
Overview
ClockV2 1 is an open-source printed circuit board by Raphael-Tibbits, from the Raphael-Tibbits/ClockV2 repository on GitHub. It is a 2-layer board of 160 × 100 mm with 70 parts on 107 nets, routed with 464 tracks and 36 vias.
It is built around the LMR33630CDDA, 74HC595 and LP2985-33DBVR, with the B320 among its other parts. Its parts include 17 resistors, 16 capacitors, 7 connectors, 6 ICs and 5 diodes. It belongs with the lEDs and displays boards of this library.
Main components
4
LMR33630CDDA
SO-8-40℃~+125℃@(TJ) 1 1V~24V 2.1MHz 24uA 3.8V~36V 3A Adjustable Buck Built-in Overcurrent Protection、Light load efficient mode、Operating status indication、Cycle-by-cycle current limiting、Hiccup current limiting、Built-in LDO regulator Step-down type Yes SO-8 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
LP2985-33DBVR
SOT-23-5-55℃~+150℃@(Tj) 1 10uA 150mA 18V 3.3V 70dB@(1kHz) 90mV@(100mA) Fixed Over Current Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
B320
SMC(DO-214AB)-55℃~+150℃ 1 Independent 100A 100uA@20V 20V 3A 500mV@3A SMC(DO-214AB) Schottky Diodes ROHSDiodes IncorporatedSchottky Diodes
README
V2_0/README.mdClockV2
Crystal oscilator clock project
This project aims to create a 1s/year accurate clock, this is done with an ovenated crystal oscilator.
There are two versions of the hardware, one with a discrete XO, which can be trimmed; and the other with a TCXO module that cant be trimmed
The hardware is made to be IEEE1101.3 compliant form factor as a 3U x 160 deep eurocard that occoupies 4HP. Mechanical stuff like a front panel is in progress
Parts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 150 | Resistor_SMD:R_0805_2012Metric | R301, R302, R303, R304, R305, R306, R307, R308, R310, R318 |
| 9 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8, JP9 |
| 5 | 1u | Capacitor_SMD:C_0805_2012Metric | C1, C7, C11, C12, C13 |
| 4 | B320 | Diode_SMD:D_SMC | D1, D2, D4, D5 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H101, H102, H103, H104 |
| 3 | 22u | Capacitor_SMD:C_1206_3216Metric | C5, C6, C10 |
| 3 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U301, U302, U303 |
| 2 | 150p | Capacitor_SMD:C_0603_1608Metric | C107, C109 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric | R107, R311 |
| 2 | 2.4V 2s NiMH | Battery:BatteryHolder_Keystone_2468_2xAAA | BT1, BT2 |
| 2 | Conn_02x04_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x04_P2.54mm_Vertical | J103, J104 |
| 1 | 1.5SMCxxCA | Diode_SMD:D_SMC | D3 |
| 1 | 1.5u | Inductor_SMD:L_Bourns-SRU1028_10.0x10.0mm | L1 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 107k | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 10u | Capacitor_SMD:C_1206_3216Metric | C9 |
| 1 | 15p | Capacitor_SMD:C_0603_1608Metric | C105 |
| 1 | 2.2u | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 220n | Capacitor_SMD:C_0805_2012Metric | C8 |
| 1 | 22R | Resistor_SMD:R_1206_3216Metric | R2 |
| 1 | 24.9k | Resistor_SMD:R_0805_2012Metric | R4 |
| 1 | 330R | Resistor_SMD:R_0805_2012Metric | R111 |
| 1 | 620n 2% | Inductor_SMD:L_1008_2520Metric | L102 |
| 1 | 8.4u 2% | Inductor_SMD:L_0603_1608Metric | L101 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal | j304 |
| 1 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Horizontal | J302 |
| 1 | Conn_02x06_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Horizontal | J303 |
| 1 | Conn_Coaxial | Connector_Coaxial:SMA_Amphenol_132289_EdgeMount | J101 |
| 1 | DIN41612_02x16_AC_EvenPins | Connector_DIN:DIN41612_C_2x16_Male_Horizontal_THT | J105 |
| 1 | FerriteBead | Inductor_SMD:L_1806_4516Metric | FB1 |
| 1 | LMR33630CDDA | Package_SO:HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.4x3.2mm_ThermalVias | U2 |
| 1 | LP2985-33DBVR | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | NUCLEO-L432KC | ClockV2_1:MODULE_NUCLEO-L432KC | U1 |
Questions
How big is the ClockV2 1 PCB?
It measures 160 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ClockV2 1 use?
70 parts, built around the LMR33630CDDA, 74HC595, LP2985-33DBVR and B320. 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 ClockV2 1 KiCad files?
From the Raphael-Tibbits/ClockV2 repository on GitHub, at the commit this page was made from: the board is V2_1/ClockV2_1/ClockV2_1.kicad_pcb and its schematic Clock_Panel/Clock_Panel.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ClockV2 1 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Raphael-Tibbits before reusing the design.
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