2 layers110.5 × 108.2 mm
4 layers60 × 40 mm
Clk pt
Espeer5/digirAn open source, modular, extensible mobile digital-mode radio transceiver design.
- Size
- 60 × 40 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 29
- Pads
- 126
- Tracks, vias
- 164, 40
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 25 Jul 2026
- Updated
- 23 Oct 2026
Overview
Clk pt is an open-source printed circuit board by Espeer5, from the Espeer5/digir repository on GitHub. It is a 4-layer board of 60 × 40 mm with 33 parts on 29 nets, routed with 164 tracks and 40 vias.
It is built around the MCP4821-E/P, CVHD-950X-100 and SI5351C-B-GM. Its parts include 9 capacitors, 7 connectors, 6 resistors, 3 ICs and 1 diode. It belongs with the radio and wireless boards of this library.
Main components
3
MCP4821-E/P
PDIP-8-40℃~+125℃ 1 12 12LSB 2.7V~5.5V 330uA 4.5us SPI Voltage Buffer PDIP-8 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)CVHD-950X-100
SMDSMD Voltage-Controlled Crystal Oscillators (VCXOs) ROHSCrystek CorporationVoltage-Controlled Crystal Oscillators (VCXOs)
SI5351C-B-GM
QFN-20(4x4)-40℃~+85℃ 1.71V~3.6V 200MHz 70ps 70ps 8 Built-in phase-locked loop、Spread spectrum、Built-in clock monitoring and loss-of-lock detection、Multi-source clock input CMOS External I2C Support QFN-20(4x4) Clock Generators, PLLs, Frequency Synthesizers ROHSSkyworks SolutionsClock Generators, PLLs, Frequency Synthesizers
README
README.mdDigiR Mobile Digital Mode Transceiver
The DigiR project is an effort to build a fully open source embedded mobile digital mode transciever design for ham operators. Many digital modes tend to require taking a computer running ham software into the field to make connections, which I consider to be a limitation in comparison to analog modes. This project is designed to remove that hurdle by creating a fully embedded platform that enables mobile digital operations.
The full tool chain of the proejct will be open source, avoiding any costly software licenses or other tools out of reach of the average radio hobbyist. An exception to the open-soruce nature of the project are the STM32Cube software packages used for configuring and flashing the STM32 MCU, but these are free packages that are accessible to the hobbyist.
Please note that this project has been significantly delayed due to hardware availability and lead times, which have changed the scope of the project. In particular, the ECP5 development board is very hard to come by at the moment, which is changing the scope of the project. Resulting from this issue some work must now be done to design a custom ECP5 hardware module for development, aside from the eventual custom radio board, increasing both the time and expense required.
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C5, C6, C7 |
| 6 | 0Ω | Resistor_SMD:R_0603_1608Metric | FB1, R2, R6, R7, R8, R11 |
| 5 | 4.7kΩ | Resistor_SMD:R_0603_1608Metric | R1, R3, R4, R5, R9 |
| 3 | ~ | Connector_Coaxial:SMA_Molex_73251-1153_EdgeMount_Horizontal | J3, J4, J7 |
| 1 | 10 µF | Capacitor_SMD:C_0805_2012Metric | C8 |
| 1 | 10µF | Capacitor_SMD:C_0805_2012Metric | C9 |
| 1 | 5351 CTL HDR | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | 680Ω | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | CLK HDR | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | CVHD-950x | CVHD_950X_100:OSC_CVHD-950X-100 | U1 |
| 1 | DAC CTL HDR | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | MCP4821 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 1 | PWR HDR | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | PWR LED | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | Si5351C-B-GM | Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.7x2.7mm | U2 |
| 1 | TestPoint | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | TP1 |
Questions
How big is the Clk pt PCB?
It measures 60 × 40 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Clk pt use?
33 parts, built around the MCP4821-E/P, CVHD-950X-100 and SI5351C-B-GM. 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 Clk pt KiCad files?
From the Espeer5/digir repository on GitHub, at the commit this page was made from: the board is src/BPM/hw/timing/clk_pt/clk_pt.kicad_pcb and its schematic src/BPM/hw/timing/clk_pt/clk_pt.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Clk pt design in my own project?
Its repository states no licence, so its author keeps all rights: ask Espeer5 before reusing the design.
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