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KTI59

calcpsu·tikeyboard·ti59_keyboard/ti59_keyboard.kicad_pcb

KTI59 PCB layout, top view — open source board by calcpsu
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About the KTI59 PCB

KTI59 is an open source PCB design by calcpsu, published on GitHub. It is a 2-layer board measuring 68 × 95.7 mm, with 59 components from 15 distinct parts.

By type, the board carries 45 switches and 14 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.

KTI59, from the project README
From the project README

KTI59 bill of materials (BOM)

59 components, 15 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
1
R0
J14
45
KEY
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +37

KTI59 design files

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

KTI59: common questions

How big is the KTI59 PCB?

The KTI59 measures 68 × 95.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the KTI59?

59 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the KTI59 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 KTI59 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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