HardLabs

Gpsfreak

rcls·gpsfreak

Gpsfreak PCB layout, top view — open source STM32 board by rcls
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About the Gpsfreak PCB

Gpsfreak is an open source STM32 PCB design by rcls, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 79.8 × 47.2 mm, with 124 components from 42 distinct parts.

Its main chip is the STM32H503KBUx, from the STM32 family. Other key parts include the MAX-M10S, LMK05318BRGZR, TG5032CGN, TPS82084SIL and TPS7A8801RTJR. By type, the board carries 50 capacitors, 39 resistors, 20 inductors, 9 ICs, 3 diodes and 2 transistors.

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

From the project

GPS disciplined frequency generator

GPSfreak — GPS Disciplined Frequency Generator =================================================

GPSfreak is a flexible, programmable, high-accuracy, low-jitter, frequency generator, using GPS as a reference.

There are 5 outputs via SMA connectors, with 4 separately programmable frequencies derived from 2 PLLs.

The outputs are driven by a Texas Instruments LMK05318b clock generator, and a U-Blox MAX-10 GPS receiver providing the overall frequency reference.

Gpsfreak, from the project README
From the project README

Main components on the Gpsfreak

MAX-M10SLMK05318BRGZRTG5032CGNSTM32H503KBUxTPS82084SILTPS7A8801RTJRTLV3601DCKR

Gpsfreak bill of materials (BOM)

124 components, 42 distinct parts.

QtyPartRefs
1
MAX-M10S
U1
1
LMK05318BRGZR
U2
1
TG5032CGN
U3
1
STM32H503KBUx
U4
2
TPS82084SIL
U5, U6
1
TPS7A8801RTJR
U7
2
TLV3601DCKR
U31, U32
1
AO3400A
Q1
1
AO3401A
Q2
1
USB_C_Receptacle_16P
J7
1
1N4148WS
D1
1
LED_GBAR
D2
1
5V6
D3
1
100n
L1
19
220
L3, L11, L12, L21, L22, L23, L24, L25 +11
23
10u
C3, C11, C21, C22, C23, C24, C29, C39 +15
16
0u1
C13, C14, C15, C25, C27, C28, C30, C31 +8
1
22p
C34
2
1u
C41, C42
1
4u7
C47
Show 22 more
QtyPartRefs
3
10n
C48, C55, C65
2
47u
C52, C62
1
10n
C78
1
0u1
C92
12
100
R1, R2, R3, R4, R6, R11, R21, R23 +4
2
0
R12, R32
6
100k
R14, R34, R35, R37, R38, R50
1
50
R31
3
5k1
R41, R42, R64
1
330
R43
1
2k7
R44
1
1k
R45
3
10k
R46, R47, R48
1
39k
R51
1
24k
R52
1
8k2
R53
1
7k5
R54
1
51k
R55
1
200k
R61
1
56k
R62
1
15k
R63
1
82k
R65

Gpsfreak design files

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

Gpsfreak: common questions

What microcontroller does the Gpsfreak use?

The Gpsfreak is built around the STM32H503KBUx, from the STM32 family.

How big is the Gpsfreak PCB?

The Gpsfreak measures 79.8 × 47.2 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Gpsfreak?

124 components, from 42 distinct parts. The full bill of materials is listed on this page.

Where can I download the Gpsfreak design files?

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

Can I use the Gpsfreak design in my own project?

Yes, under the terms of its GPL-3.0 license, which rcls chose for the repository.

Can I test firmware for the Gpsfreak 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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