HardLabs

MMDVM HS Dual Hat

phl0·MMDVM_HS_Dual_Hat·hardware/r1.3/mmdvm_hs_dual_hat.kicad_pcb

MMDVM HS Dual Hat layout, top view — open source STM32 board by phl0
Simulate this board

About the MMDVM HS Dual Hat

MMDVM HS Dual Hat is an open source STM32 PCB design by phl0, published on GitHub. It is a 2-layer board measuring 65 × 56 mm, with 117 components from 50 distinct parts.

Its main chip is the STM32F103C8T6, from the STM32 family. Other key parts include the ADF7021 and LD1117S33TR. By type, the board carries 51 capacitors, 30 resistors, 12 inductors, 9 diodes, 8 connectors and 4 ICs.

It belongs with the dev boards & breakouts designs in this gallery.

From the project

Duplex variant of MMDVM_HS_Hat

This PCB uses the MMDVM_HS by Andy CA6JAU. It has two ADF7021 onboard and allows for duplex operation with two time slots on DMR.

LEDs D4 and D5 interchanged to align with scan order. Solder jumper JP1 was added. It can be closed if the board is used on Raspberry Pi only. It ties BOOT1 to GND. BOOT0 is controlled via GPIO. The 2x3 pin header can be unpopulated in this case to save space. We placed two coils on U1 and U2 for experiments with extended VCO. These are L11 and L12 and they are optional and do not need to be inserted for UHF use. Testpoints TP1 and TP2 on backside allows the…

MMDVM HS Dual Hat, from the project README
From the project README

Main components on the MMDVM HS Dual Hat

ADF7021STM32F103C8T6LD1117S33TR

MMDVM HS Dual Hat bill of materials (BOM)

117 components, 50 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
ADF7021
U1, U2
1
STM32F103C8T6
U3
1
LD1117S33TR
U4
1
TCXO
X1
1
8MHz
Y1
1
RPi_GPIO
J1
2
SMA
P1, P2
1
I2C
P3
1
DISPLAY
P4
1
STLINK
P5
1
CONN_02X03
P7
1
USB_OTG
P8
1
DNI
SW1
3
red
D0, D3, D7
2
green
D1, D4
2
yellow
D2, D5
1
amber
D6
1
blue
D8
2
22n
L1, L2
2
20n
L3, L4
Show 30 more
QtyPartRefs
2
27n
L5, L6
2
13n
L7, L8
1
100MHz
L9
1
10u
L10
2
18n
L11, L12
4
6p8
C1, C2, C11, C12
12
10n
C3, C4, C15, C16, C17, C18, C31, C32 +4
2
220p
C5, C8
2
10p
C6, C9
2
4p7
C7, C10
13
100n
C13, C14, C19, C20, C29, C30, C35, C36 +5
2
470p
C21, C22
2
22n
C23, C24
2
15n
C25, C26
2
1n
C27, C28
2
22p
C33, C34
2
20p
C40, C41
2
47p
C47, C48
1
10u/10V
C51
1
10u
C52
2
1k1
R1, R2
2
3k8
R3, R4
2
3r9
R5, R6
2
560
R7, R8
2
270
R9, R10
13
1k
R11, R12, R13, R14, R16, R17, R18, R19 +5
2
10k
R15, R25
2
27R
R26, R27
1
1k5
R28
2
100k
R29, R30

MMDVM HS Dual Hat design files

The KiCad project lives in the phl0/MMDVM_HS_Dual_Hat repository on GitHub; these links point at the commit this page was built from.

MMDVM HS Dual Hat: common questions

What microcontroller does the MMDVM HS Dual Hat use?

The MMDVM HS Dual Hat is built around the STM32F103C8T6, from the STM32 family.

How big is the MMDVM HS Dual Hat?

The MMDVM HS Dual Hat measures 65 × 56 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MMDVM HS Dual Hat?

117 components, from 50 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the MMDVM HS Dual Hat design files?

From the phl0/MMDVM_HS_Dual_Hat repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the MMDVM HS Dual Hat design in my own project?

The repository has no license, so all rights stay with phl0. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the MMDVM HS Dual Hat 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.

Similar boards