HardLabs

MidiBox3

Dethernal·Midibox3·midiBox3/midiBox3.kicad_pcb

MidiBox3 PCB layout, top view — open source STM32 board by Dethernal

About the MidiBox3 PCB

MidiBox3 is an open source STM32 PCB design by Dethernal, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 100 mm, with 114 components from 56 distinct parts.

Its main chip is the STM32F103CBT6, from the STM32 family. Other key parts include the 74HCT00, H11L1, JTE0624D12, TRACO_TMR-1222_THT and L7805. By type, the board carries 36 capacitors, 34 resistors, 8 ICs, 8 connectors, 8 test points and 6 diodes.

It belongs with the audio designs in this gallery.

From the project

New features for DIN5 MIDI → Waweblaster interface board. Now with MT-32 stuff.

My attempt to make new Waveblaster-compatible interface board.

Work with all current loop MIDI source Additional Note On volume control with rotary encoder * Can work without microcontroller as simple interface board but other features will gone.

Measure power consumption. What maximum current on +5V line is? Do I really need output filter and what parameters it must have? So, I need to characterize all imortant parameters.

Main components on the MidiBox3

74HCT00H11L1JTE0624D12TRACO_TMR-1222_THTL7805MC33063ADSTM32F103CBT674ACT04

MidiBox3 bill of materials (BOM)

114 components, 56 distinct parts.

QtyPartRefs
1
74HCT00
U1
1
H11L1
U2
1
JTE0624D12
U3
1
TRACO_TMR-1222_THT
U3*
1
L7805
U4
1
MC33063AD
U5
1
STM32F103CBT6
U6
1
74ACT04
U7
1
IRFL110
Q1
1
Crystal_GND24
Y1
1
BarrelJack
J1
1
DIN5 IN
J2
1
WaveBlaster
J3
1
DIN5 OUT
J4
1
RSA 2x
J5
1
STM32_PROG
J6
1
LED_CON
J7
1
USB_B_Micro
J8
1
D_VALUE
SW1
1
SW_Reed
SW2
Show 36 more
QtyPartRefs
8
—
TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8
1
VBUS
USB1
1
GND
USB2
1
D-
USB3
1
D+
USB4
1
1N4148
D1
1
DB104
D2
2
PESD5V0S1BA
D3, D4
1
LED
D5
1
1N5819
D14
2
100nH
L1, L2
2
33nH
L3, L4
1
220 uH
L5
1
100 nH
L6
8
100pF
C1, C2, C8, C9, C27, C28, C31, C36
5
220uF
C3, C12, C18, C19, C25
6
1uF
C4, C5, C17, C21, C22, C26
2
47pF
C6, C7
4
15pF
C10, C11, C23, C24
3
47uF
C13, C14, C35
2
1uF
C15, C16
1
10uF
C20
3
100nF
C29, C32, C33
1
10nF
C30
1
470pF
C34
1
510R
R1
1
270R
R2
6
10K
R3, R6, R24, R25, R32, R34
1
220R
R4
9
470R
R5, R8, R9, R10, R11, R12, R13, R14 +1
1
4.7K
R7
8
1K
R16, R17, R18, R19, R20, R21, R22, R23
2
1.5K
R26, R33
3
1R
R27, R28, R29
1
2.7K
R30
1
22K
R31

MidiBox3 design files

The KiCad project lives in the Dethernal/Midibox3 repository on GitHub; these links point at the commit this page was built from.

MidiBox3: common questions

What microcontroller does the MidiBox3 use?

The MidiBox3 is built around the STM32F103CBT6, from the STM32 family.

How big is the MidiBox3 PCB?

The MidiBox3 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the MidiBox3?

114 components, from 56 distinct parts. The full bill of materials is listed on this page.

Where can I download the MidiBox3 design files?

From the Dethernal/Midibox3 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the MidiBox3 design in my own project?

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

Can I test firmware for the MidiBox3 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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