Gamma split
About the Gamma split PCB
Gamma split is an open source AVR/Arduino PCB design by ahtn, published on GitHub. It is a 2-layer board measuring 109 × 71 mm, with 120 components from 53 distinct parts.
Its main chip is the ATXMEGA32A4U-AUR, from the AVR/Arduino family. Other key parts include the MCP73832T-2ACI/OT, MCP1700T-3002E/TT, MCP1700T3302ETT, 74LVC1G34SE-7DI and nRF24L01_module. By type, the board carries 26 capacitors, 25 diodes, 24 relays, 13 LEDs, 12 resistors and 9 ICs.
It belongs with the keyboards designs in this gallery.
Main components on the Gamma split
Gamma split bill of materials (BOM)
120 components, 53 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MCP73832T-2ACI/OT MCP73831 | SOT-23-5 | U1 |
| 1 | MCP1700T-3002E/TT MCP1700 (3.0V) | SOT-23 | U2 |
| 1 | MCP1700T3302ETT MCP1700 (3.3V) | SOT-23 | U3 |
| 1 | ATXMEGA32A4U-AUR ATXMEGA-A4U-EPAD | TQFP-44_10x10mm_P0.8mm | U4 |
| 1 | 74LVC1G34SE-7DI 74LVC1G34 | SOT-353_SC-70-5 | U5 |
| 1 | nRF24L01_module | NRF24L01-Module-SMD | U6 |
| 3 | FSUSB42MUX FSUSB42 | MSOP-10_3x3mm_P0.5mm | U7, U8, U9 |
| 2 | 670-2849-1 USB_C_Receptacle | USB_TypeC_DX07B024XJ1 | J1, J2 |
| 1 | BK-913 Battery | CR2032_MPD_BK-913_NoSolderMask | BT1 |
| 1 | 455-1719 Battery_Cell | JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | BT2 |
| 2 | Fuse | R_1206_3216Metric | F1, F2 |
| 1 | NO USB | Jumper_1x02_P2.54mm_THT | JP1 |
| 1 | NO SW | Jumper_1x02_P2.54mm_THT | JP2 |
| 1 | BATT CHECK | Jumper_1x02_P2.54mm_THT | JP3 |
| 1 | K00 | Cherry_MX_Matias_Slots_NoSilk_Back | K00 |
| 1 | K01 | Cherry_MX_Matias_Slots_NoSilk_Back | K01 |
| 1 | K02 | Cherry_MX_Matias_Slots_NoSilk_Back | K02 |
| 1 | K03 | Cherry_MX_Matias_Slots_NoSilk_Back | K03 |
| 1 | K04 | Cherry_MX_Matias_Slots_NoSilk_Back | K04 |
| 1 | K05 | Cherry_MX_Matias_Slots_NoSilk_Back | K05 |
Show 33 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | K10 | Cherry_MX_Matias_Slots_NoSilk_Back | K10 |
| 1 | K11 | Cherry_MX_Matias_Slots_NoSilk_Back | K11 |
| 1 | K12 | Cherry_MX_Matias_Slots_NoSilk_Back | K12 |
| 1 | K13 | Cherry_MX_Matias_Slots_NoSilk_Back | K13 |
| 1 | K14 | Cherry_MX_Matias_Slots_NoSilk_Back | K14 |
| 1 | K15 | Cherry_MX_Matias_Slots_NoSilk_Back | K15 |
| 1 | K20 | Cherry_MX_Matias_Slots_NoSilk_Back | K20 |
| 1 | K21 | Cherry_MX_Matias_Slots_NoSilk_Back | K21 |
| 1 | K22 | Cherry_MX_Matias_Slots_NoSilk_Back | K22 |
| 1 | K23 | Cherry_MX_Matias_Slots_NoSilk_Back | K23 |
| 1 | K24 | Cherry_MX_Matias_Slots_NoSilk_Back | K24 |
| 1 | K25 | Cherry_MX_Matias_Slots_NoSilk_Back | K25 |
| 1 | K30 | Cherry_MX_Matias_Slots_NoSilk_Back | K30 |
| 1 | K31 | Cherry_MX_Matias_Slots_NoSilk_Back | K31 |
| 1 | K32 | Cherry_MX_Matias_Slots_NoSilk_Back | K32 |
| 1 | K33 | Cherry_MX_Matias_Slots_NoSilk_Back | K33 |
| 1 | K34 | Cherry_MX_Matias_Slots_NoSilk_Back | K34 |
| 1 | K35 | Cherry_MX_Matias_Slots_NoSilk_Back | K35 |
| 1 | 401-2001 Switch-6P-2S2T | SlideSwitch_C&K_JS202011CQN | SW1 |
| 1 | CKN9112 SW_Push | SwitchPush_C&K_MultiFoot_RS-187R05A2-DS_And_PTS645_SMT | SW2 |
| 13 | WS2812B | WS2812B | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +5 |
| 6 | D | D_SOD-123 | D00, D01, D02, D03, D04, D05 |
| 1 | BAT54C-FDI D_Schottky_x2_KCom_AAK | SOT-23 | D1 |
| 18 | 1N4148W-FDI D | D_SOD-123 | D10, D11, D12, D13, D14, D15, D20, D21 +10 |
| 2 | 4.7UF 4.7uF | C_0805_2012Metric | C1, C2 |
| 2 | 1UF 1uF | C_0805_2012Metric | C3, C4 |
| 20 | 0.1UF 0.1uF | C_0805_2012Metric | C5, C6, C7, C8, C9, C10, C11, C12 +12 |
| 1 | 10uF | C_0805_2012Metric | C25 |
| 1 | 47UF 47uF | C_1206_3216Metric | C26 |
| 4 | 10K 10k | R_0805_2012Metric | R1, R6, R7, R8 |
| 2 | 470K 470k | R_0805_2012Metric | R2, R3 |
| 2 | 100K 100k | R_0805_2012Metric | R4, R5 |
| 4 | 5.1K 5.1k | R_0805_2012Metric | R9, R10, R11, R12 |
Gamma split design files
The KiCad project lives in the ahtn/keyboard_pcb repository on GitHub; these links point at the commit this page was built from.
Gamma split: common questions
What microcontroller does the Gamma split use?
The Gamma split is built around the ATXMEGA32A4U-AUR, from the AVR/Arduino family.
How big is the Gamma split PCB?
The Gamma split measures 109 × 71 mm, has 2 copper layers and is 0.8 mm thick.
How many components are on the Gamma split?
120 components, from 53 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Gamma split design files?
From the ahtn/keyboard_pcb repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Gamma split design in my own project?
The repository has no license, so all rights stay with ahtn. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Gamma split without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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