National Keyboard Mux Board
About the National Keyboard Mux Board
National Keyboard Mux Board is an open source PCB design by SteveCooling, published on GitHub under the MIT license. It is a 2-layer board measuring 80 × 37.5 mm, with 27 components from 3 distinct parts.
By type, the board carries 19 connectors and 8 diodes.
It belongs with the keyboards designs in this gallery.
From the project
Dissecting an old broken organ I got the idea to turn it into a MIDI keyboard.
Dissecting an old broken organ I got the idea to turn it into a MIDI keyboard.
I've since gotten a keybed that already had dual key switches for the velocity sensitivity, and been working on circuitry and code to support velocity sensitivity.
My plan is to produce a versatile open source keyboard controller board that can be used in various keyboard projects.
Velocity sensitive multiplexed keyboard scanning Note off velocity sensitivity (not common in commercial keyboards, fun to be had here)
National Keyboard Mux Board bill of materials (BOM)
27 components, 3 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 18 | Conn_01x01_Female | PinSlot_1x3.5mm_Flat | J1, J2, J3, J4, J5, J6, J7, J8 +10 |
| 1 | Conn_02x08_Odd_Even | IDC-Header_2x08_P2.54mm_Vertical | J19 |
| 8 | C82481 BAV74LT1G | SOT-23 | D1, D2, D3, D4, D5, D6, D7, D8 |
National Keyboard Mux Board design files
The KiCad project lives in the SteveCooling/MidiKeys repository on GitHub; these links point at the commit this page was built from.
National Keyboard Mux Board: common questions
How big is the National Keyboard Mux Board?
The National Keyboard Mux Board measures 80 × 37.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the National Keyboard Mux Board?
27 components, from 3 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 National Keyboard Mux Board design files?
From the SteveCooling/MidiKeys repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the National Keyboard Mux Board design in my own project?
Yes, under the terms of its MIT license, which SteveCooling chose for the repository.
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