4 layers160 × 185.5 mm
4 layers160 × 100 mm
Crystal oscilator clock project
- Size
- 160 × 100 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 53
- Nets
- 71
- Pads
- 258
- Tracks, vias
- 498, 226
- Pours
- 260
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 27 Oct 2025
- Updated
- 25 Oct 2026
Overview
Card 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 × 100 mm with 53 parts on 71 nets, routed with 498 tracks and 226 vias.
It is built around the ATMEGA328P-MU, 74HC595 and ADP7142ARDZ-2.5-R7, with the LM1117DT-3.3 among its other parts. Its parts include 15 capacitors, 14 resistors, 7 connectors, 6 ICs and 3 inductors. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
4
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)
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
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
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
53| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 150 | Resistor_SMD:R_0805_2012Metric | R301, R302, R303, R304, R305, R306, R307, R308, R310, R318 |
| 6 | 1u | Capacitor_SMD:C_0805_2012Metric | C101, C106, C108, C302, C303, C304 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H101, H102, H103, H104 |
| 3 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U301, U302, U303 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_2.0x2.0mm | TP101, TP102, TP103 |
| 2 | 160p | Capacitor_SMD:C_0603_1608Metric | C107, C109 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric | R107, R311 |
| 2 | Conn_02x04_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x04_P2.54mm_Vertical | J103, J104 |
| 1 | 1.3p | Capacitor_SMD:C_0603_1608Metric | C105 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric | C102 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C103 |
| 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 | 330R | Resistor_SMD:R_0805_2012Metric | R111 |
| 1 | 4.7u | Capacitor_SMD:CP_Elec_4x3 | C104 |
| 1 | 47k | Resistor_SMD:R_0805_2012Metric | R101 |
| 1 | 47u | Capacitor_SMD:CP_Elec_5x3.9 | C111 |
| 1 | 620n 2% | Inductor_SMD:L_1008_2520Metric | L102 |
| 1 | 84u 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_Horizontal | J106 |
| 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:BNC_Amphenol_031-6575_Horizontal | J101 |
| 1 | DIN41612_02x16_AC_EvenPins | Connector_DIN:DIN41612_C_2x16_Male_Horizontal_THT | J105 |
| 1 | LM1117DT-3.3 | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U102 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H4.3mm | SW101 |
Questions
How big is the Card PCB?
It measures 160 × 100 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Card use?
53 parts, built around the ATMEGA328P-MU, 74HC595, ADP7142ARDZ-2.5-R7 and LM1117DT-3.3. 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 Card KiCad files?
From the Raphael-Tibbits/ClockV2 repository on GitHub, at the commit this page was made from: the board is V2_0/Manufacturing/Card.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 Card 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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