OMX-27 v3 BOM
OMX-27 v3 comes with SMD parts pre-assembled. Some alternate/replacement parts are listed here for reference
| Mouser | QTY | Part | Value | Package |
|---|---|---|---|---|
| 688-RK09K1130A5R | 5 | VR1-VR4,VR6 | 10K linear | 9MM_SNAP-IN_POT* |
| 652-PEC11R-4015F-S24 | 1 | VR5 | PEC11 + SWITCH | Encoder with Switch |
| 540-MX3A-L1NA | 27 | K1-K27 | CHERRY-MX | CHERRY-MX RGB Silent Red *** |
| (alt) | 27 | K1-K27 | Kailh Choc V1 | Kailh Choc V1 Red *** |
| 1 | OLED - 128x32 I2C display | **See below |
* POTS - I used trimmer type pots because they're a little more low profile. But you can use alpha pots (10K linear) or whatever you have around.
** OLED - 128x32 I2C display (SSD1306) with pin order ( GND, VCC, SCL, SDA )
example search terms: "0.91" 128x32 IIC I2C White OLED LCD Display DIY Module For Arduino"
Optional battery
A lipo battery can be added.
This battery from tinycircuits is recommended. Also available from Mouser or Digikey
The battery plug on the PCB is a JST SH connector (2 pin, 1.0 mm pitch) or you can solder the battery wires directly to the PCB. Please note the PCB markings for polarity.
A 3D printable battery box is also available. [Model link]
*** Key switches:
Cherry MX or Kailh Choc V1 switches can be used for the build. Denki-oto kits default to Cherry MX RGB Silent Red or Kailh Choc V1 Red switches and will have a different keyplate and spacer setup depending on the switch choice.
Switches can be best obtained from various online keyboard shops like mechanicalkeyboards.com.
Keycaps - Choc:
Choc Kits come with FK MBK "Dot Glow" keycaps.
Nice blank Choc keycaps with shine-thru are hard to find. A translucent white MBK keycap made with POM material looks great with backlighting. Search online keyboard shops in your country for "MBK POM"
FK offers a Custom Service if you wanted to create your own.
Keycaps - MX:
Any MX-compatible keycaps will work, but you'll want one designed for backlighting, such as a "backlit two-shot", "translucent", "shine-through", or "windowed".
I like the DSA profile caps for this application.
I have the DSA windowed keycaps in various colors available for sale in sets on my shop.
Signature Plastics sells the keycap I use in a Light or Dark grey - DSA "Dolch" Keyset (Two Shot) "Windowed" Keys (choose the LED Keys option).
These come in a pack of 4 keycaps. You will need 7 packs (@ ~$60 total).
Flashquark Translucent DSA Keycaps (in Black, White, Clear, Blue, Red) - 50 per pack. ($12.99-$15.99 per pack)
Blue Hat 1U DSA Blank Printed Keycaps PBT Keycaps (Gray Translucent) - 37 per pack. ($15.55 per pack and prime shipping)
(about the same as the black ones from Flashquark above)
Maxkeyboard Black Translucent MX Blank (pack of 9). ($21 for 3 packs)
Knobs
So many opinions about knobs.
Micro knobs (Befaco Style) can be found at these places:
https://www.thonk.co.uk/shop/tall-trimmer-toppers/
https://www.thonk.co.uk/shop/micro-knobs/
https://www.thonk.co.uk/shop/tall-trimmer-toppers/
USB Cable:
I recommend using a right angle extension cable like this one from Amazon
Be sure you have a good, known working, USB DATA CABLE and not just a charging cable.