Power prioritiser
About the Power prioritiser PCB
Power prioritiser is an open source PCB design by eigenlucy, published on GitHub under the MIT license. It is a 2-layer board measuring 2.4 × 2.8 mm, with 3 components from 3 distinct parts.
By type, the board carries 1 transistor and 1 resistor.
It belongs with the power & battery designs in this gallery.
From the project
open source flashlight
A simple circuit to prioritise a power source over another.
This is useful for situations like a USB-charged battery operated device, where you also want it to work when connected over just USB power.
Often, cheap (and annoyingly expensive) devices neglect this circuit and shutdown when connected over USB. I find this infuriating!
This is better than merely pulling power through the charger circuit because often the inrush currents of a circuit will overwhelm the charger IC and cause it to shut down. This can even lead in the nastiest cases to a boot-loop where the device never charges…
Power prioritiser bill of materials (BOM)
3 components, 3 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ? | SOT-23_L2.9-W1.3-P1.90-LS2.4-BR | Q1 |
| 1 | ? | SOD-323_L1.8-W1.3-LS2.5-RD | DS1 |
| 1 | 100mW Thick Film Resistors 75V ±100ppm/℃ ±1% 10kΩ 0603 Chip Resistor - Surface Mount ROHS | R0603 | R1 |
Power prioritiser design files
The KiCad project lives in the eigenlucy/uv-lamp repository on GitHub; these links point at the commit this page was built from.
Power prioritiser: common questions
How big is the Power prioritiser PCB?
The Power prioritiser measures 2.4 × 2.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Power prioritiser?
3 components, from 3 distinct parts. The full bill of materials is listed on this page.
Where can I download the Power prioritiser design files?
From the eigenlucy/uv-lamp repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Power prioritiser design in my own project?
Yes, under the terms of its MIT license, which eigenlucy chose for the repository.
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