# KB75 -- A open-source 75% Keyboard
This is a 75% mechanical keyboard that has per-key rgb, hotswappable keys, an OLED, and a rotary encoder. It's based on the Raspberry Pi Pico so it supports QMK and KMK.

I decided to make this because I love mechanical keyboards but the one I was using broke. And keebs over here just don't got much variety or they are low quality, so I decided to make my own.

## Features:
- Open Source
- Hotswappable
- Per-key SK6812MINI-E RGB Backlight
- A rotary encoder
- 75% Layout
- 0.91" Vertical OLED
- Easy to program (depends from person to person)
- QMK and KMK both are supported
- 3D Printed / CNC Case and plate

# Images:

## Schematic:
![image](https://github.com/user-attachments/assets/cfd4738b-5b43-49ae-911f-5875bcfafe73)
![image](https://github.com/user-attachments/assets/65755e5e-9f7b-4e59-bf23-cc4ad8f4f99c)
![image](https://github.com/user-attachments/assets/df5bc66d-f5ec-4af1-a6f9-a0fd519aaadf)
![image](https://github.com/user-attachments/assets/09fb924f-59c3-478c-83f3-995c3e38d4e7)
![image](https://github.com/user-attachments/assets/1c719356-ee8c-4351-86d6-308cb0b51cb2)

## PCB:
![image](https://github.com/user-attachments/assets/2ff0b96a-4ae4-49fb-b56f-280cb86136e3)
![image](https://github.com/user-attachments/assets/5a96142f-f472-45b7-b496-eda47d46aaef)

## Case and Plate:
<img width="740" height="457" alt="image" src="https://github.com/user-attachments/assets/8bab08a4-6933-4d09-a02b-3946d412c79c" />

![image](https://github.com/user-attachments/assets/33a885f4-abac-4eb6-9522-66822cb0bcca)

<img width="835" height="483" alt="image" src="https://github.com/user-attachments/assets/9e4e7016-09ee-47bc-bc58-b8b960e35dc4" />
<img width="812" height="398" alt="image" src="https://github.com/user-attachments/assets/996ba2c3-d25e-43e3-a705-7830139288b1" />
<img width="806" height="438" alt="image" src="https://github.com/user-attachments/assets/b40b3322-a511-43e3-be50-897f300d3f81" />

![image](https://github.com/user-attachments/assets/dd6a3568-84c5-4c85-8ecf-e7fdb112501c)
![image](https://github.com/user-attachments/assets/979b6574-06b5-48f7-a6d6-333a6c9c4e90)

# Bill Of Materials

Here's my BOM:

| Item                   | Quantity | MOQ            | LCSC #                                                                                                                    |Price |
|------------------------|----------|----------------|---------------------------------------------------------------------------------------------------------------------------|------|
| 0805 Capacitors 100nf  | 82       | 100            | [C49678](https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT_YAGEO-CC0805KRX7R9BB104_C49678.html)  |$0.44 |
| 0805 Resistors 10K ohm | 2        | 100            | [C84376](https://lcsc.com/product-detail/Chip-Resistor-Surface-Mount_YAGEO-RC0805FR-0710KL_C84376.html)                   |$0.19 |
| 0805 Diodes            | 83       | Multiples of 50 | [C82544](https://lcsc.com/product-detail/Schottky-Diodes_Diodes-Incorporated-1N5819HW-7-F_C82544.html)                   |$2.7|
| Kailh MX Sockets       | 82       | Multiples of 10, 30, 70, or 110 | [CPG151101S11](https://www.aliexpress.com/item/1005007476614771.html)                                    |$9.15 |
| Raspberry Pi Pico      | 1        | 1              | [Raspberry Pi Pico](https://www.aliexpress.com/item/1005007104120926.html)                                                |$1.50|
| SK6812MINI-E           | 82       | Multiples of 5 | [C5149201](https://www.lcsc.com/product-detail/RGB-LEDs-Built-in-IC_OPSCO-Optoelectronics-SK6812MINI-E_C5149201.html)     |$5.02 |
| MX Style Stabilizers   | 1 Kit    | -              | [Gateron Stabs](https://www.aliexpress.com/item/1005005389406072.html)                                                    |$11.21|
| 0.91" OLED White       | 1        | 5              | [0.91" OLED](https://www.aliexpress.com/item/1005007038294972.html)                                                       |$8.86 |
| Si2318CDS-T1-GE3       | 1        | 5              | [C14498](https://lcsc.com/product-detail/MOSFETs_Vishay-Intertech-Si2318CDS-T1-GE3_C14498.html)                           |$0.56 |
| MX Style Keycaps       | 1 Set    | -              | [Keycaps](https://www.aliexpress.com/item/1005007730150989.html)                                                          |$11.85|
| MX Switches            | 82       | Multiples of 10| [Switches](https://www.aliexpress.com/item/1005006528632637.html)                                                         |$41.99|
| EC11 Encoder           | 1        | 5              | [Encoder](https://www.aliexpress.com/item/32976046900.html)                                                               |$3.06 |
| EC11 Encoder Knob      | 1        | 1              | [Knob](https://www.aliexpress.com/item/1005007576522714.html)                                                             |$1.18 |
| 74AHCT125              | 1        | 5              | [C148198](https://lcsc.com/product-detail/Buffers-Drivers-Receivers-Transceivers_Nexperia-74AHCT125PW-118_C148198.html)   |$1.12 | 

The total cost will be a bit over $124 including PCB, shipping, and filament.