2 layers100 × 100 mm
Splitflap
besi/split-flap-clock
Split Flap clock or calendar utilising four 28BYJ-48 stepper motors.
91 parts1
2 layers68.6 × 53.3 mm
ThermalSystem
nebisman/UNThermal2- Size
- 68.6 × 53.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 35
- Pads
- 74
- Tracks, vias
- 115, 8
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 24 Jan 2024
- Updated
- 19 Mar 2026
Overview
ThermalSystem is an open-source printed circuit board by nebisman, from the nebisman/UNThermal repository on GitHub. It is a 2-layer board of 68.6 × 53.3 mm with 21 parts on 35 nets, routed with 115 tracks and 8 vias.
It is built around the DS18B20, OPA340NA and SK6812MINI-E, with the BD139 among its other parts. Its parts include 7 connectors, 4 capacitors, 4 resistors, 3 diodes and 2 ICs.
Main components
4
DS18B20
TO-92-55℃~+125℃ 12bit 3V~5.5V 750ms Single-bus ±0.4℃ TO-92 Temperature Sensors ROHSUMWTemperature Sensors
OPA340NA
SOT-23-5SOT-23-5 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
SK6812MINI-E
SMD-40℃~+85℃ 0.6mA 1.78mm 120mcd~240mcd 120° 160mcd~320mcd 1kHz 2.8mm 2000V 3.2mm 3.7V~5.5V 460nm~470nm 515nm~525nm 620nm~625nm 800Kbit/s 815mcd~1275mcd Semi-transparent lens SMD RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsRGB LEDs(Built-In IC)
BD139
TO-126-65℃~+150℃ 1 NPN 1.5A 10uA 12.5W 500mV 5V 63 80V NPN TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3, C4 |
| 3 | SK6812MINI | LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | D1, D2, D3 |
| 1 | 0.1 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 130k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 2k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | 4.7k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 470uF | Capacitor_Tantalum_SMD:CP_EIA-7343-30_AVX-N_Pad2.25x2.55mm_HandSolder | C1 |
| 1 | Analog | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J3 |
| 1 | BD139 | Package_TO_SOT_THT:TO-126-3_Vertical | Q1 |
| 1 | DS18B20 | Package_TO_SOT_THT:TO-92_Inline | U1 |
| 1 | Digital/PWM | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J2 |
| 1 | Digital/PWM | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J4 |
| 1 | FUT | MountingHole:MountingHole_5mm_Pad_TopOnly | P3 |
| 1 | OPA340NA | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | Power | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J1 |
| 1 | TCH+ | MountingHole:MountingHole_5mm_Pad_TopOnly | P1 |
| 1 | TCH- | MountingHole:MountingHole_5mm_Pad_TopOnly | P2 |
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Questions
How big is the ThermalSystem PCB?
It measures 68.6 × 53.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ThermalSystem use?
21 parts, built around the DS18B20, OPA340NA, SK6812MINI-E and BD139. 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 ThermalSystem KiCad files?
From the nebisman/UNThermal repository on GitHub, at the commit this page was made from: the board is SchematicLayout/ThermalSystem.kicad_pcb and its schematic SchematicLayout/ThermalSystem.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ThermalSystem design in my own project?
Its repository states no licence, so its author keeps all rights: ask nebisman before reusing the design.