4 layers55 × 100.5 mm
OSS Radio Hardware Design
Arkos-Engineering/HT-15_hardware
We can split this out into separate repos later, right now its very convenient to have everything here.
256 parts72
2 layers84 × 116.5 mm
Donut
rosalyntg/donutA simple ring light designed for a StereoZoom 4 microscope.
- Size
- 84 × 116.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 145
- Nets
- 87
- Pads
- 1,432
- Tracks, vias
- 207, 82
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 27 Sep 2026
- Updated
- 27 Sep 2026
Overview
Donut is an open-source printed circuit board by rosalyntg, from the rosalyntg/donut repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 84 × 116.5 mm with 145 parts on 87 nets, routed with 207 tracks and 82 vias.
It is built around the MP3383GS-P, AP2205-50W5-7-MS and ICM7555CBAZ-T, with the IN-P36BTEUW.50, 1N914BWT and RL1220T-R050-G among its other parts. Its parts include 63 diodes, 11 capacitors, 11 resistors, 3 ICs and 1 transistor.
Main components
11
MP3383GS-P
SOIC-16LED DriversMonolithic Power Systems
AP2205-50W5-7-MS
SOT-23-5SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIUncategorised
ICM7555CBAZ-T
SOIC-80℃~+70℃ 1 2V~18V Adjustable duty cycle oscillation、Reset function SOIC-8 555 Timers / Counters ROHSRenesas ElectronicsTimersIN-P36BTEUW.50
PLCC-4-40℃~+100℃ 30mA 3V 5.8cd 5000K 60° White PLCC-4 LED Indication - Discrete ROHSInoluxLED Indication - Discrete
1N914BWT
SOD-523F-55℃~+150℃ 1V@100mA 200mW 300mA 4ns 5uA@75V 75V Standalone SOD-523F Switching Diodes ROHSonsemiSwitching Diodes
RL1220T-R050-G
0805-55℃~+125℃ 0ppm/℃~+350ppm/℃ 250mW 50mΩ Thin Film Resistor ±2% 0805 Chip Resistor - Surface Mount ROHSSusumuChip Resistor - Surface MountP091S-FC20BR10K
THroughhole10kΩ 50mW ±20% THroughhole Potentiometers, Variable Resistors ROHSTT ElectronicsPotentiometers & Variable ResistorsPA5449.333NLT
-156mΩ 3.3A 33uH 3A ±20% - Power Inductors ROHSPulse ElecPower Inductors
B290
SMB(DO-214AA)-65℃~+150℃ 1 Independent 2A 790mV@2A 7uA@90V 90V SMB(DO-214AA) Schottky Diodes ROHSDiodes IncorporatedSchottky Diodes
PJ-063AH
插件-25℃~+85℃ 24V 2mm 6.5mm 8A DC Power Jack Right Angle 插件 DC Power Connectors ROHSCUIDC Power Connectors
FDD86102LZ
DPAK(TO-252)-55℃~+150℃ 1 N-channel 1.54nF 100V 15pF 245pF 31mΩ@4.5V 35A 3V 54W N-Channel DPAK(TO-252) MOSFETs ROHSonsemiMOSFETs
README
README.mdDonut
A simple ring light designed for a StereoZoom 4 microscope.
Basic description
A ring light with adjustable brightness (potentiometer knob) driven by a MP3383 LED driver. It has 60 LEDs on them arranged in a circular pattern to give good lighting.
Images
Parts
145| Qty | Value | Footprint | References |
|---|---|---|---|
| 60 | LED_Small | inolux:IN-P36ATEUW | D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24 +44 |
| 43 | LOGO | LOGO | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** +27 |
| 6 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5, H6 |
| 2 | 0 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R15 |
| 2 | 1N914BWT | Diode_SMD:D_SOD-523 | D62, D63 |
| 2 | 4.7u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 2 | 470n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C4 |
| 2 | C | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5, C10 |
| 2 | Jumper_2_Bridged | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1, JP2 |
| 2 | Jumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3, JP4 |
| 1 | .05 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 10 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R11 |
| 1 | 100k | tt:Potentiometer_P091S | SW1 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9 |
| 1 | 1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11 |
| 1 | 2.2u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C12 |
| 1 | 20k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 220p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7 |
| 1 | 270 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 1 | 2M | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | 33u | Inductor_SMD:L_APV_APH0840 | L1 |
| 1 | 470u | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C8 |
| 1 | 47u | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C9 |
| 1 | 500 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R14 |
| 1 | 82k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | AP2205-50W5-7 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | B290 | Diode_SMD:D_SMA-SMB_Universal_Handsoldering | D1 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_CUI_PJ-063AH_Horizontal | J1 |
| 1 | FDD86102LZ | onsemi:TO-252-2_TabPin1 | Q1 |
| 1 | ICM7555xB | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | MP3383 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
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Questions
How big is the Donut PCB?
It measures 84 × 116.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Donut use?
145 parts, built around the MP3383GS-P, AP2205-50W5-7-MS, ICM7555CBAZ-T and IN-P36BTEUW.50. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Donut KiCad files?
From the rosalyntg/donut repository on GitHub, at the commit this page was made from: the board is donut/donut.kicad_pcb and its schematic donut/donut.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Donut design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).