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Midikraken TRS

Windfisch·midikraken·hardware/trs_pcb/pcb.kicad_pcb

Midikraken TRS PCB layout, top view — open source board by Windfisch
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About the Midikraken TRS PCB

Midikraken TRS is an open source PCB design by Windfisch, published on GitHub. It is a 2-layer board measuring 56 × 110 mm, with 118 components from 12 distinct parts.

Other key parts include the 74HC165, 74HC595 and HCPL-2630. By type, the board carries 57 resistors, 24 diodes, 18 connectors, 11 ICs and 8 capacitors.

It belongs with the audio designs in this gallery.

From the project

A open source, open hardware up-to-16x USB-MIDI-interface for around 15 bucks in its smallest configuration.

This page describes the hardware itself. A build manual is available here.

Midikraken boards are meant to be stacked using M3 spacers and screws. In such a setup, one "master" exists that holds the microcontroller with the USB port, and zero or multiple "slaves" are daisy-chained with their upstream ("from master") or downstream ("to slave") ports.

The photo shows an (almost) fully equipped Midikraken including:

Midikraken TRS, from the project README
From the project README

Main components on the Midikraken TRS

74HC16574HC595HCPL-2630

Midikraken TRS bill of materials (BOM)

118 components, 12 distinct parts.

QtyPartRefs
1
74HC165
U102
2
74HC595
U103, U104
8
HCPL-2630
U201, U202, U203, U204, U205, U206, U207, U208
2
Conn_02x03_Odd_Even
J101, J102
16
AudioJack3
J201, J202, J203, J204, J205, J206, J207, J208 +8
8
LED
D201, D202, D203, D204, D205, D206, D207, D208
8
yellow
D301, D302, D303, D304, D309, D310, D311, D312
8
green
D305, D306, D307, D308, D313, D314, D315, D316
8
100n
C201, C202, C203, C204, C205, C206, C207, C208
1
R
R101
32
220
R201, R202, R203, R204, R209, R210, R211, R212 +24
24
1k
R205, R206, R207, R208, R217, R218, R219, R220 +16

Midikraken TRS design files

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

Midikraken TRS: common questions

How big is the Midikraken TRS PCB?

The Midikraken TRS measures 56 × 110 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Midikraken TRS?

118 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the Midikraken TRS design files?

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

Can I use the Midikraken TRS design in my own project?

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

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