HardLabs

Minidexed

handeyeco·minidexed-pcb

Minidexed PCB layout, top view — open source Raspberry Pi board by handeyeco

About the Minidexed PCB

Minidexed is an open source Raspberry Pi PCB design by handeyeco, published on GitHub. It is a 2-layer board measuring 130.8 × 81.5 mm, with 47 components from 26 distinct parts.

Its main chip is the RASPBERRY_PI_2_3, from the Raspberry Pi family. Other key parts include the C82942, PCM5102, 74HCT14 and H11L1. By type, the board carries 16 capacitors, 14 resistors, 6 connectors, 4 ICs, 4 switches and 1 diode.

It belongs with the audio and displays & leds designs in this gallery.

From the project

PCB for MiniDexed

Custom PCB for MiniDexed, an open-source FM synthesizer. It has:

- An endless encoder - 3 Cherry buttons (back/home/select) - A 1602 display - 3.5mm TRS MIDI in/thru/out - USB MIDI - 3.5mm TRS audio out (via the PCM5102 DAC)

See the writeup on my blog for a full explanation of the circuit.

- probonopd and the whole MiniDexed team - diyelectromusic for MiniDexed work and PCB design notes - The whole Dexed lineage - The KiCad maintainers

Minidexed, from the project README
From the project README

Main components on the Minidexed

C82942PCM510274HCT14H11L1

Minidexed bill of materials (BOM)

47 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C82942
A3.3V ME6211C33
U1
1
PCM5102
U2
1
74HCT14
U3
1
H11L1
U4
1
Audio Out
J1
1
MIDI In
J2
1
RASPBERRY_PI_2_3
Raspberry_Pi_2_3
J3
1
MIDI Thru
J4
1
MIDI Out
J5
1
GND TP
J6
1
WC1602A
DS1
1
10K
10k
RV1
1
Encoder
SW1
1
B1
SW2
1
B2
SW3
1
B3
SW4
1
1N4148WS
D1
6
100NF
100nf
C1, C3, C5, C7, C9, C16
4
10UF
10uf
C2, C4, C10, C13
2
2.2UF
2.2uf
C6, C8
Show 6 more
QtyPartRefs
2
10NF
10nf
C11, C12
2
2.2NF
2.2nf
C14, C15
3
470
R1, R4, R12
3
10K
10k
R2, R3, R5
5
220
R6, R10, R11, R13, R14
3
22
R7, R8, R9

Minidexed design files

The KiCad project lives in the handeyeco/minidexed-pcb repository on GitHub; these links point at the commit this page was built from.

Minidexed: common questions

What microcontroller does the Minidexed use?

The Minidexed is built around the RASPBERRY_PI_2_3, from the Raspberry Pi family.

How big is the Minidexed PCB?

The Minidexed measures 130.8 × 81.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Minidexed?

47 components, from 26 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 Minidexed design files?

From the handeyeco/minidexed-pcb repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Minidexed design in my own project?

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

Can I test firmware for the Minidexed without the hardware?

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

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