HardLabs

Ehrbl

willpuckett·ehrbl

Ehrbl PCB layout, top view — open source board by willpuckett

About the Ehrbl PCB

Ehrbl is an open source PCB design by willpuckett, published on GitHub under the SHL-2.1 license. It is a 2-layer board measuring 234.9 × 106.1 mm, with 84 components from 8 distinct parts.

Other key parts include the UMP1NTR. By type, the board carries 62 connectors, 8 ICs, 4 capacitors, 2 battery holders and 2 switches.

It belongs with the keyboards designs in this gallery.

From the project

🍂 is in the air...

After spending the day at my computer, I stepped out with friends Saturday night for a burger. On the patio of our local institution, the air was cool.

I had been wanting to squeeze a Ferris Sweep out of a Xiao somehow and it occurred to me as I later continued working that maybe I was actually trying to make a 28 key keyboard. I reached for a leaf to lay over the keys: the maple fit nicely, conjuring memories of beurre d'érable (maple butter) in Montreal's Jean-Talon Market.

Ehrbl, from the project README
From the project README

Main components on the Ehrbl

UMP1NTR

Ehrbl bill of materials (BOM)

84 components, 8 distinct parts.

QtyPartRefs
8
UMP1NTR
U5, U6, U7, U8, U9, U10, U11, U12
56
3305-0-15-80-47-27-10-0
J1, J2, J3, J4, J5, J6, J7, J8 +48
4
310-13-107-41-001000
MF254V-11-07-0743
J53, J54, J55, J56
2
0906-2-15-20-75-14-11-0
0906
J57, J58
2
MY-LR44-03-J
BT1, BT2
6
CESD5V0D3 ZA
E1, E2, E3, E4, E5, E6
2
SSSS811101
SW29, SW30
4
C_Small
C1, C2, C3, C4

Ehrbl design files

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

Ehrbl: common questions

How big is the Ehrbl PCB?

The Ehrbl measures 234.9 × 106.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ehrbl?

84 components, from 8 distinct parts. The full bill of materials is listed on this page.

Where can I download the Ehrbl design files?

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

Can I use the Ehrbl design in my own project?

It is published under SHL-2.1, which limits how it may be reused; read the license before building on it.

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