2 layers132.1 × 45.7 mm
IPoS
peterheinrich/InternetOverSpaghetti
Transmitting IP packages over a pair of spaghetti thus demonstrating how media independent IP really is.
42 parts342
2 layers
Powersupply
mean00/lnPowerSupply1Overengineered DC/DC power supply
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 11
- Pads
- 31
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 6 (file 20211014)
- Created
- 16 Jul 2022
- Updated
- 31 Oct 2025
Overview
Powersupply is an open-source printed circuit board by mean00, from the mean00/lnPowerSupply repository on GitHub, published under the MIT licence. It is a 2-layer board with 13 parts on 11 nets.
It is built around the LM358. Its parts include 8 resistors, 2 diodes, 1 IC and 1 connector. It belongs with the power boards and the STM32 boards of this library.
Main components
1README
README.mdlnPowerSupply
Introduction
This is a very overengineered desktop power supply. Small feature list :
- Powered by Lidl or Aldi battery back
- Current limiting (not very good)
- Large display (320x240)
- Large fonts
C++ vs Rust
The software comes in two flavors :
- C++
- Rust
You can switch to either one (un)commenting the SET(ENABLE_RUST True) in the top CmakeLists.txt
NB: The rust version contains bit of c++ (the lnArduino low level driver + the ina219 driver)
Electrical Detail
You can use pretty much any DC/DC converter as a core, you need to adjust R2 depending on the feedback voltage (see lnPowerSupply.pdf) Be careful to stay below ~ 24v else the INA219 will blow.
Formula is ~ R2>420*FB
- FB=1.25=> R2>500
- FB=0.8=> R2>360...
The overal design is made of 3 parts :
- The DC/DC converter board itself
- The DC/DC control board, controlled over i2C
- The main board with a STM32 or GD32 driving the screen
Why go to such a design ?
You need to have the control part close to the DC/DC You need to have the SPI screen AWAY from the control board
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 50k | Resistor_SMD:R_0603_1608Metric | R4, R6, R8 |
| 2 | 1K | Resistor_SMD:R_0603_1608Metric | R5, R7 |
| 2 | D_Schottky | Diode_SMD:D_0805_2012Metric | D1, D2 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | RV1 |
| 1 | 10m | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 3.3k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | Conn_01x02_Female | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J1 |
| 1 | LM358 | Package_SO:SOIC-8-N7_3.9x4.9mm_P1.27mm | U1 |
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Questions
What parts does the Powersupply use?
13 parts, built around the LM358. 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 Powersupply KiCad files?
From the mean00/lnPowerSupply repository on GitHub, at the commit this page was made from: the board is kicad/powersupply.kicad_pcb and its schematic kicad/power.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Powersupply 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).