Four tone
About the Four tone PCB
Four tone is an open source PCB design by ideocentric, published on GitHub under the CC-BY-SA-4.0 license. It is a 2-layer board measuring 130 × 70 mm, with 50 components from 12 distinct parts.
By type, the board carries 18 resistors, 12 diodes, 9 connectors, 6 transistors and 5 capacitors.
From the project
Arduino fan organ: four 12 V blowers voicing 3D printed recorder-style pipes
An Arduino Nano carrier board with six low-side MOSFET fan channels. four-tone uses four of them; the other two are spare for other projects. It is designed for JLCPCB fabrication and assembly, and rev A was ordered on 2026-09-15.
The KiCad files keep the project's original four-tone-driver name; the board itself is titled "six fan driver". Every symbol carries its JLCPCB/LCSC part number in an LCSC field.
Four tone bill of materials (BOM)
50 components, 12 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 6 | AO3400A | SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6 |
| 1 | C2915641 PWR 12V/5V | TerminalBlock_Phoenix_MKDS-1,5-4-5.08_1x04_P5.08mm_Horizontal | J1 |
| 2 | C7499333 Socket 1x15 | PinSocket_1x15_P2.54mm_Vertical | J2, J3 |
| 6 | B2B-XH-A | JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J11, J12, J13, J14, J15, J16 |
| 6 | SS14 | D_SMA | D1, D2, D3, D4, D5, D6 |
| 6 | C2286 Red | LED_0603_1608Metric | D11, D12, D13, D14, D15, D16 |
| 1 | C72477 100uF 25V | CP_Elec_6.3x7.7 | C1 |
| 2 | C15850 10uF 25V | C_0805_2012Metric | C2, C4 |
| 2 | 100NF 100nF | C_0603_1608Metric | C3, C5 |
| 6 | 1k | R_0603_1608Metric | R1, R2, R3, R4, R5, R6 |
| 6 | 100K 100k | R_0603_1608Metric | R11, R12, R13, R14, R15, R16 |
| 6 | 4.7K 4.7k | R_0603_1608Metric | R21, R22, R23, R24, R25, R26 |
Four tone design files
The KiCad project lives in the ideocentric/four-tone repository on GitHub; these links point at the commit this page was built from.
Four tone: common questions
How big is the Four tone PCB?
The Four tone measures 130 × 70 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Four tone?
50 components, from 12 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 Four tone design files?
From the ideocentric/four-tone 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 Four tone design in my own project?
Yes, under the terms of its CC-BY-SA-4.0 license, which ideocentric chose for the repository.