Keyboard 555
About the Keyboard 555 PCB
Keyboard 555 is an open source PCB design by 1999AZZAR, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 48 mm, with 23 components from 16 distinct parts.
Other key parts include the NE555P. By type, the board carries 7 switches, 7 resistors, 2 connectors, 2 capacitors, 1 IC and 1 buzzer.
It belongs with the keyboards and audio designs in this gallery.
From the project
Autonomous, end-to-end KiCad PCB design skill for AI coding agents (Antigravity, Claude Code, Codex). Headless automation via kicad-cli & pcbnew, DRC verification, and JLCPCB manufacturing exports.
A compact 7-note musical keyboard and synthesizer organ built around a single classic NE555 timer in an astable multivibrator configuration. Designed from schematic to 2-layer PCB fabrication in KiCad 9 with 100% production DRC/ERC pass (--severity-all: 0 violations, 0 warnings, 0 unconnected items).
- Sound Generation: Single NE555 precision bipolar timer (DIP-8 socketed) running in an astable multivibrator topology. - 7-Note Diatonic Scale: C5 to B5 notes triggered by 6x6mm tactile switches. - Silent Idle Operation: Pressing any key inserts that note's tuning resistor between Discharge…
Main components on the Keyboard 555
Keyboard 555 bill of materials (BOM)
23 components, 16 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NE555P | DIP-8_W7.62mm_Socket | U1 |
| 1 | USB_C_16P | USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | Audio_Jack | Jack_3.5mm_PJ320D_Horizontal | J2 |
| 1 | Buzzer | Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | 10k | Potentiometer_Bourns_3386P_Vertical | RV1 |
| 2 | 5.1k | R_0805_2012Metric | R_CC1, R_CC2 |
| 7 | SW_Key | SW_PUSH_6mm_H5mm | SW1, SW2, SW3, SW4, SW5, SW6, SW7 |
| 1 | 100nF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 1 | 10nF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C2 |
| 1 | 13k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 12k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 9.1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 8.2k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 7.5k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 6.8k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7 |
Keyboard 555 design files
The KiCad project lives in the 1999AZZAR/pcb-skill repository on GitHub; these links point at the commit this page was built from.
Keyboard 555: common questions
How big is the Keyboard 555 PCB?
The Keyboard 555 measures 100 × 48 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Keyboard 555?
23 components, from 16 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 Keyboard 555 design files?
From the 1999AZZAR/pcb-skill repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Keyboard 555 design in my own project?
Yes, under the terms of its MIT license, which 1999AZZAR chose for the repository.
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