HardLabs

Gpsdo

AndreasArendt·gpsdo·hardware/gpsdo/gpsdo.kicad_pcb

Gpsdo PCB layout, top view — open source STM32 board by AndreasArendt

About the Gpsdo PCB

Gpsdo is an open source STM32 PCB design by AndreasArendt, published on GitHub under the MIT license. It is a 4-layer board measuring 70 × 70 mm, with 71 components from 24 distinct parts.

Its main chip is the STM32F411CEUx, from the STM32 family. Other key parts include the SN74LVC1T45DCK, REF5040AD, AD5541A, OPA197xD and AMS1117-3.3. By type, the board carries 40 capacitors, 14 resistors, 9 ICs, 3 diodes, 2 connectors and 1 crystal.

It belongs with the rf & radio designs in this gallery.

From the project

Low cost GPS Disciplined Oscillator

GPSDO (GPS Disciplined Oscillator) combines the precision of a high-quality OCXO (Oven-Controlled Crystal Oscillator) with the pulse-per-second (PPS) signal from a GNSS receiver. The goal is to achieve accurate time and frequency reference, down to the nanosecond level.

This project aims to create an open-source and affordable GPSDO from scratch, including designing custom hardware (PCB) and developing the supporting software.

Gpsdo, from the project README
From the project README

Main components on the Gpsdo

SN74LVC1T45DCKREF5040ADAD5541AOPA197xDSTM32F411CEUxAMS1117-3.374HC161SN74LVC1G125DBV

Gpsdo bill of materials (BOM)

71 components, 24 distinct parts.

QtyPartRefs
2
SN74LVC1T45DCK
U1, U2
1
REF5040AD
U3
1
AD5541A
U4
1
OPA197xD
U5
1
STM32F411CEUx
U6
1
AMS1117-3.3
U7
1
74HC161
U8
1
SN74LVC1G125DBV
U9
1
X322516MLB4SI
X1
1
USB_C_Receptacle_USB2.0_14P
J3
1
Conn_01x05
J7
1
NTCG103JF103FT1
TH1
3
LED
D1, D2, D3
1
10uH
L1
26
100n
C1, C2, C4, C5, C7, C8, C9, C11 +18
6
10u
C3, C10, C13, C28, C29, C30
4
1u
C6, C12, C26, C36
2
12p
C16, C17
2
4.7u
C18, C25
3
100
R1, R5, R6
Show 4 more
QtyPartRefs
3
33
R4, R8, R18
3
10k
R7, R9, R17
3
1.1k
R12, R13, R14
2
22k
R15, R16

Gpsdo design files

The KiCad project lives in the AndreasArendt/gpsdo repository on GitHub; these links point at the commit this page was built from.

Gpsdo: common questions

What microcontroller does the Gpsdo use?

The Gpsdo is built around the STM32F411CEUx, from the STM32 family.

How big is the Gpsdo PCB?

The Gpsdo measures 70 × 70 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Gpsdo?

71 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the Gpsdo design files?

From the AndreasArendt/gpsdo repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Gpsdo design in my own project?

Yes, under the terms of its MIT license, which AndreasArendt chose for the repository.

Can I test firmware for the Gpsdo without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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