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2 layers351.4 × 99.7 mmNext, the printed circuit board in 3D

Next

AndrewBDavis/NeXT761

Custom Left-handed Keyboard PCB and Acrylic Case using Vintage Alps Electric SKCL/SKCM Keyswitches and NeXT Keycaps

Open in PCBKitView on GitHub.kicad_pcb
Size
351.4 × 99.7 mm
Copper layers
2
Thickness
1.6 mm
Parts
184
Nets
120
Pads
417
Tracks, vias
739, 39
Pours
3
Routed
Yes
KiCad
KiCad 6 (file 20211014)
Created
23 Sep 2019
Updated
25 Mar 2022

Overview

Next is an open-source printed circuit board by AndrewBDavis, from the AndrewBDavis/NeXT76 repository on GitHub. It is a 2-layer board of 351.4 × 99.7 mm with 184 parts on 120 nets, routed with 739 tracks and 39 vias.

It is built around the ATMEGA32U4-AU. Its parts include 84 switches, 82 diodes, 8 capacitors, 7 resistors and 1 IC. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.

Main components

1

README

README.md

NeXT76 Left-Handed Alps Keyboard

The primary goal of this project was create as PCB and accompanying layered acrylic case to exclusively support NeXT non-adb keycaps and Alps Electric SKCM/SKCL switches.

next_pcb next_model

Supported Layouts

This keyboard only supports a modifed NeXT non-adb layout with no volume, brightness or arrow keys and a numpad that is moved to the left of the alphanumericals. Shift key leds are supported.

Numpad Layouts supported:

1u1u1u1u1u1u1u1u1u1u1u1u
1u1u1u1u1u1u1u1u1u1u1u1u
1u1u1u1u1u1u1u1u1u1u1u1u
1u1u1u2u2u1u1u1u1u1u1u1u
2u2u1u2u2u1u2u2u1u2u2u1u

(Some layouts not shown explicitly)

BOM for Alps76 keyboard

REF:VALUE:FOOTPRINT:COMPONENT
C122pC_0805
C222pC_0805
C31uC_0805
C44.7uC_0805
C50.1uC_0805
C60.1uC_0805
C70.1uC_0805
C80.1uC_0805
J1USB_mini_BUSB_miniB_hirose_5S8UX60SC-MB-5S8 Hirose
R122R_0805
R222R_0805
R310KR_0805
R410KR_0805
R51KR_0805
R61KR_0805
R71KR_0805
SW1SW_PUSHCustomTE 1825966-1
U1ATMEGA32U4QFP44ATMega32u4-AU
X1CRYSTALFA-23816MHz, 12PF
D(78)DIODESOD-1231N4148
LED(3)LEDLED_D3.0mm3mm Round Top LED

Revisions

V0.0: Prototype
V1.0: Initial Release
    Cleaned up trace routing
    Added more numpad configurations
V1.1: Added second numpad LED location option
V1.2: Updated diode footprints,

Parts

184
QtyValueFootprintReferences
78DDiode_SMD:D_SOD-123D0:0, D0:1, D0:2, D0:3, D0:4, D0:5, D0:6, D0:7, D0:8, D0:10, D0:11, D0:12, D0:13, D0:14, D0:15, D0:16 +62
78KEYSWKeyboard_Footprints:AlpsK0:0, K0:1, K0:2, K0:3, K0:4, K0:5, K0:6, K0:7, K0:8, K0:10, K0:11, K0:12, K0:13, K0:14, K0:15, K0:16 +62
5KEYSWKeyboard_Footprints:Alps_SecondaryK0:3_1, K3:3_1, K4:0_1, K4:1_1, K4:2_1
40.1uCapacitor_SMD:C_0805_2012MetricC5, C6, C7, C8
4LEDLED_THT:LED_D3.0mmLED1, LED1_1, LED2, LED3
31kResistor_SMD:R_0805_2012MetricR5, R6, R7
210kResistor_SMD:R_0805_2012MetricR3, R4
222Resistor_SMD:R_0805_2012MetricR1, R2
222pCapacitor_SMD:C_0805_2012MetricC1, C2
116MHz_12pFCrystal:Crystal_SMD_SeikoEpson_FA238-4Pin_3.2x2.5mmX1
11uCapacitor_SMD:C_0805_2012MetricC3
14.7uCapacitor_SMD:C_0805_2012MetricC4
1ATmega32U4-AUPackage_QFP:LQFP-44_10x10mm_P0.8mmU1
1RESETKeyboard_Footprints:TE_1825966-1SW1
1USB_mini_micro_BKeyboard_Footprints:USB_miniB_hirose_5S8J1

Questions

How big is the Next PCB?

It measures 351.4 × 99.7 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Next use?

184 parts, built around the ATMEGA32U4-AU. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Next KiCad files?

From the AndrewBDavis/NeXT76 repository on GitHub, at the commit this page was made from: the board is next.kicad_pcb and its schematic next.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Next design in my own project?

Its repository states no licence, so its author keeps all rights: ask AndrewBDavis before reusing the design.

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