HardLabs

Expander midi

doctea·usb_midi_clocker_hardware·expander_midi/expander_midi.kicad_pcb

Expander midi PCB layout, top view — open source board by doctea

About the Expander midi PCB

Expander midi is an open source PCB design by doctea, published on GitHub. It is a 2-layer board measuring 20 × 128.5 mm, with 44 components from 13 distinct parts.

Other key parts include the LD1117. By type, the board carries 20 resistors, 6 capacitors, 4 connectors and 1 IC.

It belongs with the audio designs in this gallery.

From the project

IMPORTANT: DO NOT USE THESE FOR ANYTHING YET, THEY ARE VERY MUCH PROTOTYPES AND HAVE SOME PROBLEMS!!!!

IMPORTANT: DO NOT USE THESE FOR ANYTHING YET, THEY ARE VERY MUCH PROTOTYPES AND HAVE SOME PROBLEMS!!!!

Files for PCB modules for use by usbmidiclocker project.

- IMPROVE: reduce size of jack holes to make a snugger fit with less wobble? - IMPROVE: Some nice panel graphics!

- DONE: FIX: Replace the voltage regulator with one that will actually be able to deliver enough amps to power the screen and Teensy facepalm - ~~Can work around this for the moment by connecting directly to 5v Eurorack power with eg Dupont cables~~ - FIX: Fix/bridge/remove power diode that prevents power from USB going…

Main components on the Expander midi

LD1117

Expander midi bill of materials (BOM)

44 components, 13 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LD1117
U1
1
Conn_02x06_Odd_Even
J1_BACK1
1
Conn_02x06_Odd_Even
J1_FRONT1
1
Conn_01x06_Pin
J2_BACK1
1
Conn_01x06_Socket
J2_FRONT1
8
MIDI In Jack 3.5mm stereo jack
JMIDIIN1, JMIDIIN2, JMIDIIN3, JMIDIIN4, JMIDIOUT1, JMIDIOUT2, JMIDIOUT3, JMIDIOUT4
1
Conn_02x05_Counter_Clockwise
MIDI_EXPANDER_1
4
HCPL-0631
ULPZWmidi1, ULPZWmidi2, ULPZWmidi3, ULPZWmidi4
2
100NF
100nF
C1, C4
4
100N
100n
C2, C3, C5, C6
8
47R
R1, R2, R3, R4, R5, R6, R7, R8
8
220R
R9, R10, R11, R12, R15, R16, R17, R18
4
470R
R13, R14, R19, R20

Expander midi design files

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

Expander midi: common questions

How big is the Expander midi PCB?

The Expander midi measures 20 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Expander midi?

44 components, from 13 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 Expander midi design files?

From the doctea/usb_midi_clocker_hardware 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 Expander midi design in my own project?

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

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