2 layers160 × 100 mm
4 layers160 × 185.5 mm
ClockV2
Raphael-Tibbits/ClockV2Crystal oscilator clock project
- Size
- 160 × 185.5 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 99
- Nets
- 89
- Pads
- 427
- Tracks, vias
- 792, 412
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 27 Oct 2025
- Updated
- 25 Oct 2026
Overview
ClockV2 is an open-source printed circuit board by Raphael-Tibbits, from the Raphael-Tibbits/ClockV2 repository on GitHub. It is a 4-layer board of 160 × 185.5 mm with 99 parts on 89 nets, routed with 792 tracks and 412 vias.
It is built around the ATMEGA328P-MU, LMV358 and 74HC595, with the 74LVC1GX04GV, ADP7142ARDZ-2.5-R7 and LM1117DT-3.3 among its other parts. Its parts include 31 resistors, 23 capacitors, 13 connectors, 8 ICs and 6 diodes. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
10
ATMEGA328P-MU
HVQFN-32(5x5)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH VQFN-32(5x5) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontroller Units (MCUs/MPUs/SOCs)
LMV358
SOP-8-40℃~+125℃ 10pA 10pA 1MHz 2 2.5V~5.5V 20mA 20nV/√Hz@10kHz 2uV/℃ 40uA 5mV 600V/ms 65dB EMI filtering/RF suppression Rail-to-Rail Input, Rail-to-Rail Output SOP-8 Operational Amplifier ROHSTECH PUBLICOperational Amplifier
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
74LVC1GX04GV
SC-74SC-74 Specialty Logic ROHSNexperiaSpecialty Logic
ADP7142ARDZ-2.5-R7
SOIC-8-EP-40℃~+125℃ 1 2.5V 200mA 40V Fixed Over Temperature Protection Positive SOIC-8-EP Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAnalog DevicesVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
LM1117DT-3.3
TO-2520℃~+125℃@(Tj) 1 1.2V@(800mA) 15V 3.3V 5mA 75dB@(120Hz) 800mA Fixed Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive TO-252 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
1N4148WS
SOD-3231.25V@150mA 100V 150mA 1uA@75V 200mW 2A 4ns Independent SOD-323 Switching Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Switching Diodes
IRLR024NTR
TO-252-55℃~+175℃ 1 N-channel 2.3V 21nC@10V 30A 40mΩ@4.5V 44W 60V N-Channel TO-252 MOSFETs ROHSMinosMOSFETs
LTD-4608JR
DIP-100.39 12.8mmx19.86mmx7mm 2 7 Segment 70mW Common Anode Red DIP-10 LED Segment Displays ROHSLite-OnLED Segment Displays
TDCR1060M
DIP-16DIP-16 LED Segment Displays ROHSVishay IntertechnologyLED Segment Displays
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
99| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 150 | Resistor_SMD:R_0805_2012Metric | R301, R302, R303, R304, R305, R306, R307, R308, R310, R316, R317, R318 |
| 8 | 1u | Capacitor_SMD:C_0805_2012Metric | C101, C106, C108, C206, C207, C302, C303, C304 |
| 6 | 1k | Resistor_SMD:R_0805_2012Metric | R107, R202, R203, R207, R311, R312 |
| 5 | 47k | Resistor_SMD:R_0805_2012Metric | R101, R201, R208, R209, R210 |
| 4 | 330R | Resistor_SMD:R_0805_2012Metric | R111, R313, R314, R315 |
| 4 | Conn_02x04_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x04_P2.54mm_Vertical | J103, J104, J201, J202 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H101, H102, H103, H104 |
| 3 | 10n | Capacitor_SMD:C_0603_1608Metric | C103, C201, C208 |
| 3 | 150p | Capacitor_SMD:C_0603_1608Metric | C107, C109, C203 |
| 3 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U301, U302, U303 |
| 3 | RED | LED_SMD:LED_0805_2012Metric | D301, D302, D303 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_2.0x2.0mm | TP101, TP102, TP103 |
| 2 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal | J106, J304 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H4.3mm | SW101, SW301 |
| 1 | 0.02R | Resistor_SMD:R_2512_6332Metric | R206 |
| 1 | 0.1-2p | Capacitor_SMD:C_Trimmer_Voltronics_JZ | C202 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric | C102 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3266W_Vertical | RV201 |
| 1 | 15p | Capacitor_SMD:C_0603_1608Metric | C105 |
| 1 | 16MHz | Crystal:Crystal_SMD_HC49-SD | Y201 |
| 1 | 1N4148WS | Diode_SMD:D_SOD-323 | D201 |
| 1 | 1m | Inductor_SMD:L_7.3x7.3_H3.5 | L103 |
| 1 | 2.2u | Capacitor_SMD:C_0805_2012Metric | C112 |
| 1 | 220u | Capacitor_SMD:CP_Elec_10x10 | C110 |
| 1 | 22p C0G | Capacitor_SMD:C_0805_2012Metric | C205 |
| 1 | 3-30p | Capacitor_SMD:C_Trimmer_Voltronics_JZ | C204 |
| 1 | 4.7u | Capacitor_SMD:CP_Elec_4x3 | C104 |
| 1 | 470R | Resistor_SMD:R_0805_2012Metric | R205 |
| 1 | 47u | Capacitor_SMD:CP_Elec_5x3.9 | C111 |
| 1 | 5M | Resistor_SMD:R_0805_2012Metric | R204 |
| 1 | 620n 2% | Inductor_SMD:L_1008_2520Metric | L102 |
| 1 | 74LVC1GX04 | Package_TO_SOT_SMD:SOT-23-6_Handsoldering | U201 |
| 1 | 8.4u 2% | Inductor_SMD:L_0603_1608Metric | L101 |
| 1 | ADP7142ARDZ-2.5 | Package_TO_SOT_SMD:SOT-23-5_HandSoldering | U104 |
| 1 | ATmega328P-M | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm | U101 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J301 |
| 1 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Horizontal | J302 |
| 1 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical_SMD | J402 |
| 1 | Conn_02x06_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical_SMD | J403 |
| 1 | Conn_02x06_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Horizontal | J303 |
| 1 | Conn_Coaxial | Connector_Coaxial:BNC_Amphenol_031-6575_Horizontal | J101 |
| 1 | DIN41612_02x16_AC_EvenPins | Connector_DIN:DIN41612_C_2x16_Male_Horizontal_THT | J105 |
| 1 | GRN | LED_SMD:LED_0805_2012Metric | D304 |
| 1 | IRLR024N | PCM_Package_TO_SOT_SMD_AKL:TO-252-2 | Q201 |
| 1 | LDR03 | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | R309 |
| 1 | LED | LED_SMD:LED_0805_2012Metric | D202 |
| 1 | LM1117DT-3.3 | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U102 |
| 1 | LMV358 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U202 |
| 1 | LTD-4608JR | LTD_4608JR:LTD-4608JR_LTO | DS401 |
| 1 | TDCR1060M | TDCR1060M:DISPLAY_TDCR1060M | DS402 |
| 1 | Thermistor_NTC | Resistor_SMD:R_0805_2012Metric | TH201 |
Questions
How big is the ClockV2 PCB?
It measures 160 × 185.5 mm and has 4 copper layers, 1.6 mm thick.
What parts does the ClockV2 use?
99 parts, built around the ATMEGA328P-MU, LMV358, 74HC595 and 74LVC1GX04GV. 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 KiCad files?
From the Raphael-Tibbits/ClockV2 repository on GitHub, at the commit this page was made from: the board is V2_0/ClockV2.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 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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