HardLabs

Qx10 keyboard adapter

brijohn·qx10·kicad/qx10_keyboard_adapter/linear/qx10_keyboard_adapter.kicad_pcb

Qx10 keyboard adapter PCB layout, top view — open source RP2040/RP2350 board by brijohn
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About the Qx10 keyboard adapter PCB

Qx10 keyboard adapter is an open source RP2040/RP2350 PCB design by brijohn, published on GitHub. It is a 2-layer board measuring 88.5 × 34 mm, with 18 components from 11 distinct parts.

Its main chip is the 74LS125, from the RP2040/RP2350 family. Other key parts include the 74LS245, 74LS541, 74LS00 and 74LS04. By type, the board carries 9 capacitors, 6 ICs, 2 connectors and 1 diode.

It belongs with the keyboards designs in this gallery.

From the project

Epson QX-10 Files

Main components on the Qx10 keyboard adapter

74LS24574LS54174LS12574LS0074LS04

Qx10 keyboard adapter bill of materials (BOM)

18 components, 11 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74LS245
SN74LVC1T45DRL
SN74LS245N
U1
2
74LS541
SN74LVC1T45DRL
SN74LS541N
U2, U3
1
74LS125
Pico
SN74LS125AN
U4
1
74LS00
LM1117MP-5.0
SN74LS00N
U5
1
74LS04
74LVC2G04
SN74LS04N
U6
1
JUMPER_3_OPEN
DIN-8
68001-103HLF
J1
1
JUMPER_3_OPEN
Conn_01x04
68001-103HLF
J2
1
D_Schottky_Small
D1
7
0.1uf
C1, C2, C3, C4, C5, C6, C9
1
1uf
C7
1
2.2uf
C8

Qx10 keyboard adapter design files

The KiCad project lives in the brijohn/qx10 repository on GitHub; these links point at the commit this page was built from.

Qx10 keyboard adapter: common questions

What microcontroller does the Qx10 keyboard adapter use?

The Qx10 keyboard adapter is built around the 74LS125, from the RP2040/RP2350 family.

How big is the Qx10 keyboard adapter PCB?

The Qx10 keyboard adapter measures 88.5 × 34 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Qx10 keyboard adapter?

18 components, from 11 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 Qx10 keyboard adapter design files?

From the brijohn/qx10 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 Qx10 keyboard adapter design in my own project?

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

Can I test firmware for the Qx10 keyboard adapter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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