HardLabs

Mrmidi

chatoooo·mrmidi

Mrmidi PCB layout, top view — open source board by chatoooo
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About the Mrmidi PCB

Mrmidi is an open source PCB design by chatoooo, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 70.5 × 57.2 mm, with 13 components from 10 distinct parts.

Other key parts include the 74HCT14N and PCM1808 module. By type, the board carries 5 resistors, 2 connectors, 2 diodes, 1 IC, 1 module and 1 transistor.

It belongs with the audio designs in this gallery.

From the project

MIDI interface for MiSTer FPGA with ADC to mix music with SFX.

A1 is PCM1808 module abvailable on Aliexpress: . There is another PCM1808 module, usually purple which is not compatible with this project. The module can be soldered directly or using female pin headers (1x2, 1x5, 1x3).

Mrmidi, from the project README
From the project README

Main components on the Mrmidi

74HCT14NPCM1808 module

Mrmidi bill of materials (BOM)

13 components, 10 distinct parts.

QtyPartRefs
1
74HCT14N
U1
1
PCM1808 module
A1
1
BS170
Q1
1
MIDI out
J1
1
USB3_A
J2
2
LED
D1, D2
1
100n
C1
2
180R
R1, R2
1
4K7
R3
2
220R
R4, R5

Mrmidi design files

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

Mrmidi: common questions

How big is the Mrmidi PCB?

The Mrmidi measures 70.5 × 57.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Mrmidi?

13 components, from 10 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mrmidi design files?

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

Can I use the Mrmidi design in my own project?

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

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