2022.02.22: H-bridge deadband sequencer
2022-02-22 21:35 by Ian
This is a logic-level front-end to an H-bridge that provides deadband enforcement. This particular circuit supports 4-channels; sufficient for two H-bridges.
2021.09.05: LiPo reverse engineering
2021-09-05 08:13 by Ian
I needed a specific kind of battery for a project. And I happened to have one salvaged from a ruined Nexus7 sitting in my "Reverse-Engineering TODO" box that fits the application perfectly. I guess it's time to tear into this battery and put it to good use.
Home VoIP System Part 1: Provisioning the phones
2020-06-13 23:54 by Ian
A HOWTO for preparing the VoIP phones for re-use.
Home VoIP System Part 0: Introduction and materials
2020-06-13 23:50 by Ian
Building a home VoIP intercom/paging/control system.
Viam Sonus 2.0
2019-11-16 14:45 by Ian
This is an improved version of my audio router board.
The Woose Tracker
2019-08-08 10:59 by Ian
This project is a wearable child's toy for team games. I have two children that are young enough to start drawing treasure maps and playing sophisticated games of hide-and-seek. And they both watch cartoons that have characters with wearable computers. So I embarked on a quick project to build something that was meant to be used for fun.
Recent breakout boards
2019-07-28 16:46 by Ian
Last month was busy for hardware. I spent most of the month in KiCAD, and OshPark just shipped the last wave.
Room temperature CO2 reduction catalyst
2019-04-05 11:18 by Ian
I've seen lots of media outlets in Normistan touting a new liquid phase catalyst as a means of removing carbon dioxide from the atmosphere and sequestering it as coal. But my chemistry background tells me that this is never going to be useful for that purpose.
What follows is my rough analysis of the energy requirements of running this reaction with the given catalyst.
Professional advice for new engineers
2019-04-02 09:57 by Ian
What follows is a set of perspectives and principles that I have collected at what might be considered the midpoint of my life as a practicing engineer. They have served me well in professional life.
Loudmouth
2018-11-10 10:47 by Ian
Loudmouth is my 8-channel network-connected audio amplifier. It contains a RasPi3 wearing an AudioInjector Octo hat. This is a machine I started building in 2018 to pipe audio to different rooms in my house.