2 layers127.5 × 45 mm
Power supply
PhysicsUofRAUI/laoe_projects
A place to hold all projects I have made while reading the book Learning The Art of Electronics
20 partsMIT
2 layers80 × 47 mm
Dusk to dawn
PhysicsUofRAUI/laoe_projectsA place to hold all projects I have made while reading the book Learning The Art of Electronics
- Size
- 80 × 47 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 20
- Pads
- 60
- Tracks, vias
- 60, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 Dec 2024
- Updated
- 14 Mar 2025
Overview
Dusk to dawn is an open-source printed circuit board by PhysicsUofRAUI, from the PhysicsUofRAUI/laoe_projects repository on GitHub, published under the MIT licence. It is a 2-layer board of 80 × 47 mm with 26 parts on 20 nets, routed with 60 tracks and 0 vias.
Its parts include 10 transistors, 7 connectors, 6 resistors and 1 diode.
README
power_supply_project/readme.mdIntro
This project is part of my learning for the learning the Art of Electronics. It is a simple power supply that I made based on what I've learned.
Regulator calculations
Output Voltage
Vref = 1.25V
R2 = 2k
R4 = 2.2k
R5 = 0 - 10k
Next part is going to ignore the Iref error term that comes out of the reference terminal for simplicity.
Vout ~ Vref[1 + (R4+R5)/R2]
The minimum Vout would then be: Vout = 1.25V + 1.25V(2.2k/2k) = 2.6V
The maximum Vout would then be: Vout = 1.25V + 1.25V(12.2k/2k) = 8.9V
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J2, J3, J4, J5, J6, J7 |
| 6 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q3, Q4, Q5, Q6, Q7, Q8 |
| 4 | 2N3906 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q2, Q9, Q10 |
| 2 | 22k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R5 |
| 1 | 33k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 680 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 68k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | Battery_Cell | Battery:Battery_Panasonic_CR2032-HFN_Horizontal_CircularHoles | BT1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | LOGO | kicad_libraries:farm_hacks | G*** |
| 1 | R_Photo | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R3 |
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Questions
How big is the Dusk to dawn PCB?
It measures 80 × 47 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Dusk to dawn use?
26 parts. 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 Dusk to dawn KiCad files?
From the PhysicsUofRAUI/laoe_projects repository on GitHub, at the commit this page was made from: the board is dusk_to_dawn/ecad/ecad.kicad_pcb and its schematic SRAM_Programming/SRAM_Programming.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Dusk to dawn design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).