2022.06.18: Metal casting

2022-06-18 23:47 by Ian

Yes, I will allow the children to pour the 2000-degree liquid metal.

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The BuzzBox

2022-06-14 12:13 by Ian

As an object lesson in electricity, my youngest boy and I built a high Wattage transformer box with a trigger. It is named BuzzBox because while operating under full load, it emits that 60Hz buzz that usually means a fire is about to start.

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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.

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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.

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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.

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Home VoIP System Part 0: Introduction and materials

2020-06-13 23:50 by Ian

Building a home VoIP intercom/paging/control system.

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Viam Sonus 2.0

2019-11-16 14:45 by Ian

This is an improved version of my audio router board.

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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.

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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.

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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.

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