Sek Coil sphere
About the Sek Coil sphere PCB
Sek Coil sphere is an open source PCB design by lhm0, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 140 × 140 mm, with 43 components from 18 distinct parts.
Other key parts include the TPS54202DDC and MH253. By type, the board carries 17 capacitors, 13 ICs, 7 resistors, 4 diodes and 2 inductors.
It belongs with the displays & leds and power & battery designs in this gallery.
From the project
Rotating LED Sphere - a POV display with RP2040
However, alignment of the rotor now is done by placing washers between header and pcb, if necessary.
Furthermore, I have added a file "print_instructions.pdf" in the /mechanics subfolder, with slicer images of the parts that need nut inlays.
UPDATE August 29th, 2025 There are two push switches on the power supply pcb, that control the speed of the motor. The "speed" button is used to increase the motor speed step by step. Once the maximum speed is reached, it jumps back to zero. The "off" button turns the motor off.
Main components on the Sek Coil sphere
Sek Coil sphere bill of materials (BOM)
43 components, 18 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | TPS54202DDC | SOT-23-6 | U101, U102 |
| 2 | ~ | Pin_D1.0mm | U103, U104 |
| 1 | MH253 | MH253 | U105 |
| 4 | ~ | slot_long | U106, U111, U112, U113 |
| 4 | ~ | slot_short | U107, U108, U109, U110 |
| 4 | SS34 | DIOM7959X265N | D101, D102, D103, D104 |
| 2 | C177245 33µH | L_Bourns_SRP7028A_7.3x6.6mm | L103, L104 |
| 2 | C45783 22µF, 25V | C_0805_2012Metric | C101, C102 |
| 2 | C13585 10µF, 50V | C_1206_3216Metric | C103, C104 |
| 5 | 100NF 100nF | C_0402_1005Metric | C105, C106, C107, C108, C117 |
| 2 | 47PF 47pF | C_0402_1005Metric | C109, C112 |
| 1 | 10PF 10pF | C_0402_1005Metric | C110 |
| 1 | 30PF 30pF | C_0603_1608Metric | C111 |
| 4 | C12891 22µF, 25V | C_1206_3216Metric | C113, C114, C115, C116 |
| 4 | 100K 100k | R_0402_1005Metric | R101, R102, R105, R106 |
| 1 | 22K 22k | R_0402_1005Metric | R103 |
| 1 | 13K 13k | R_0603_1608Metric | R104 |
| 1 | 20K 20k | R_0402_1005Metric | R107 |
Sek Coil sphere design files
The KiCad project lives in the lhm0/rotating_sphere repository on GitHub; these links point at the commit this page was built from.
Sek Coil sphere: common questions
How big is the Sek Coil sphere PCB?
The Sek Coil sphere measures 140 × 140 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Sek Coil sphere?
43 components, from 18 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 Sek Coil sphere design files?
From the lhm0/rotating_sphere 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 Sek Coil sphere design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
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