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Logitech K400plus modified mechanical keyboard

Overview

This is a Logitech K400plus modified mechanical keyboard. The keyboard matrix is shown in the schematic diagram, and all data has been tested. With

the membrane contacts on the front and the power switch on the top, the pin positions from left to right are C1-C10 and R1-R11.

I also designed a small lithium-ion battery voltage regulator board using a TX4310B chip, which has been tested and works, fitting my designed casing.

All mounting points use M2 screws. For the casing, a middle layer thickness of at least 14mm is recommended for better layout.

Design Files

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Update:2026-03-26 15:27:42

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