Levinson Keyboard - 40% Split Ortholinear (Let's Split) - PCB Kit
The Levinson an improved version Let's Split and adds LED backlight and 2u key support.
Nyquist/Levinson Rev. 3 info:
The Nyquist Rev. 3 features an on-board controller (ATmega32u4) with DFU bootloader and USB-C port. The PCBs are compatible with the currently available Nyquist cases and the SP50 case. The bottom row can be broken off to turn it into a Levinson (no 2u support in that configuration). Supports MX, Alps, and Kailh Choc switches. 6 RGB underglow LEDs on each half. See Nyquist product page to sign up for stocking notifications for it.
The PCB Kit includes the following:
- 2 Levinson PCBs
- 2 Push buttons for reset
- 2 TRRS jacks
- 48 1N4148 through-hole diodes
- 2 4.7kΩ resistors for I2C
Each half of the board is a 4x6 matrix, but there is the option to have a 2u key in the innermost corners in place of 2 1u keys. The spot for the 2u has holes for Cherry PCB mounted stabilizers.
Continuing the theme of prominent people in signal processing and digital communications, the board is called the Levinson, after the Levinson-Durbin recursion algorithm. There also happens to be the Split Levinson recursion as well, which fits nicely into the world of split keyboards.
The Levinson uses QMK for its firmware, and the code for it has been merged into the main codebase. You can find it here: QMK - Levinson directory.
Cases and plates can be purchase here: Levinson/Let's Split Plates and Cases.
The case files for a sandwich-style case are still under development.
The kerf setting was set to 0.15mm for use with Lasergist and Ponoko.
Items needed for build
- 24 Diodes per PCB (through-hole (included with this item) and SMD diodes supported)
- 2 Arduino Pro Micro or Elite-C (you can mix and match)
- 2 Push buttons (included with this item)
- Optional - 2 4.7kΩ resistors if using I2C
- Switches - Alps or MX-compatible
- 2 TRRS Jacks (included with this item)
- TRRS cable
- Micro USB cable
- Optional - 2u PCB mount MX stabilizer if using 2u keys
- Optional - LED support components
- 2 AO3416 MOSFETs
- 2 4.7kΩ resistors
- Optional - LEDs and 470Ω resistors
The build guide is nearly identical to that of the Iris, so you can use this guide.