Changed Q2 and D1
D1 is now a B140, which is a MacroFab house part. It's actually a bit more expensive from distributors than the SS14FL, but the lack of a labor charge makes it quite a bit cheaper for PCBA. It's also larger, so in order to fit the new part, I moved it between Q2 and J1. This is possible because… Q2 is now a DMP3017SFG. This is a cheaper, smaller, and less over-specified MOSFET which should be fine for the job of controlling the PD Buddy Sink's output. It uses a proprietary Diodes Inc. package whose footprint I contributed to KiCad's library. Because the new MOSFET is so much smaller than the old one, I was able to fit it close to the board edge where R9 used to be. The whole output circuit has been rearranged, and I like its layout a lot more now. Also, the new position of D1 allowed me to move a bunch of reference designators closer to their footprints, which is nice.
|3 years ago|
|pd-buddy-sink||3 years ago|
|pd-buddy.pretty||3 years ago|
|programming-jig||3 years ago|
|.gitignore||3 years ago|
|LICENSE||3 years ago|
|README.md||3 years ago|
|pd-buddy.dcm||3 years ago|
|pd-buddy.lib||3 years ago|
This is the circuit board for the PD Buddy Sink, a device which aims to make USB Power Delivery accessible to any electronics hobbyist.
The board is designed for 1 oz copper on all layers. 1.6 mm thickness should be fine. Just keep in mind that it isn’t possible to assemble the board with a soldering iron anymore!
The PCB is made with KiCad, so you’ll need that if you want to make any changes. Several PCB fabricators accept KiCad PCB files directly now, but if you intend to order from one that does not, you’ll need KiCad to plot the Gerbers.
KiCad 4 supports loading footprint libraries from Git repositories, but its
support for doing the same with symbol libraries is lacking. To address this,
I added the variable
_KI_LIB_GIT. Set this path in the main KiCad window
(Preferences > Configure Paths) to point to a local copy of the
kicad-library repository to ensure that you’re using the latest schematic
PD Buddy Sink is Copyright © 2017 Clayton G. Hobbs, and made available under the CERN Open Hardware Licence v1.2. See LICENSE for more information.