2 layers30.5 × 119.1 mm
PlantWatering
MadsBornebusch/PlantFriends
Soil moisture sensor and plant watering with an ESP8266
19 parts6GPL-3.0
2 layers20.3 × 38.7 mm
Supply
cellularmitosis/lt17631A low-noise supply based on the LT1763.
- Size
- 20.3 × 38.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 9
- Pads
- 32
- Tracks, vias
- 33, 1
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 24 Feb 2018
- Updated
- 24 Feb 2018
Overview
Supply is an open-source printed circuit board by cellularmitosis, from the cellularmitosis/lt1763 repository on GitHub, published under the MIT licence. It is a 2-layer board of 20.3 × 38.7 mm with 14 parts on 9 nets, routed with 33 tracks and 1 via.
It is built around the LT1763CDE. Its parts include 4 resistors, 3 capacitors, 2 connectors, 1 IC and 1 inductor.
Main components
1README
README.mdlt1763
A low-noise supply based on the LT1763.
Schematic: pdf
OSHPark: link
Gerbers: zip
Input filter
The board has provisions for an RLC input filter (see schematic components R4, L1, C3).
You can populate these components with whatever values you like. I used this RLC calculator to analyze a few component values.
Note: C3 should be a film capacitor, e.g. Kemet R82 (4.7uF, 1uF).
Note: L1 should be a small-signal axial inductor (470uH, 100uH). Note that the 470uH inductor will saturate if more than 90mA is passed. This board is intended for use with e.g. an LTZ1000 circuit, which only draws about 30mA.
Note: A 10R resistor passing 30mA will add 0.3V of dropout.
10R, 100uH, 1uF
10R, 470uH, 4.7uF
Mounting holes
The mounting holes are intended for use with M3 brass hex stand-offs.
Lead spacing
The input and output leads fall on a 0.1" grid (breadboard compatible).
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | CONN_2X1 | SIL-2 | P1, P2 |
| 2 | Val** | hole_M3 | H***, H*** |
| 1 | 0R | R_AXIAL_0W25_059A_PL | R1 |
| 1 | 100uH | R_AXIAL_0W25_059A_PL | L1 |
| 1 | 10R | R_AXIAL_0W25_059A_PL | R4 |
| 1 | 10nF | BOXCAP_01_03_02_059A | C1 |
| 1 | 10uF | ELCAP_10_20_V_059A | C2 |
| 1 | 1uF | BOXCAP_02_03_03_059A | C3 |
| 1 | 33k | R_AXIAL_0W25_059A_PL | R2 |
| 1 | 4.7k | R_AXIAL_0W25_059A_PL | R3 |
| 1 | BEAD | FERRITE_AXIAL_04_069A | FERRITE |
| 1 | LT1763 | SO-8 | U1 |
Questions
How big is the Supply PCB?
It measures 20.3 × 38.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Supply use?
14 parts, built around the LT1763CDE. 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 Supply KiCad files?
From the cellularmitosis/lt1763 repository on GitHub, at the commit this page was made from: the board is kicad/supply.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Supply 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).
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