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Ti45 keyboard

calcpsu·tikeyboard·ti45_keyboard/ti45_keyboard.kicad_pcb

Ti45 keyboard PCB layout, top view — open source board by calcpsu

About the Ti45 keyboard PCB

Ti45 keyboard is an open source PCB design by calcpsu, published on GitHub. It is a 2-layer board measuring 68 × 85.5 mm, with 53 components from 14 distinct parts.

By type, the board carries 40 switches and 13 connectors.

It belongs with the keyboards designs in this gallery.

From the project

Keyboard replacement for TI Majestic series calculators

1970's TI calculatore keyboards are known for failure - squishy or dead keys - leading to premature death. As the original keyboards are generally unrepairable, this is a replacement using a PCB and micro tactile switches. Enjoy the use of technology advanced during the mobile phone era (0.8mm thickness tact switches!).

The PCB + switch comes to 2.4mm thick, which is nearly identical to the original 2.2mm thick keyboard in these calculators.

Ti45 keyboard, from the project README
From the project README

Ti45 keyboard bill of materials (BOM)

53 components, 14 distinct parts.

QtyPartRefs
1
C1
J1
1
R7
J2
1
R2
J3
1
C2
J4
1
R8
J5
1
R1
J6
1
C3
J7
1
R4
J8
1
R3
J9
1
C4
J10
1
R5
J11
1
R6
J12
1
C5
J13
40
KEY
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +32

Ti45 keyboard design files

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

Ti45 keyboard: common questions

How big is the Ti45 keyboard PCB?

The Ti45 keyboard measures 68 × 85.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ti45 keyboard?

53 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Ti45 keyboard design files?

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

Can I use the Ti45 keyboard design in my own project?

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

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