Category Archives: Electronics

Posts about electronics. Usually meaning electrical gadgets smaller than a proper computer.

3D Printing KC Talk

I gave a quick primer on 3D printing as a Keeping Current (CS departmental) seminar yesterday. It’s not a great standalone deck but posted (in reduced quality, gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dQUIET -dBATCH -sOutputFile=/path/to/output.pdf /path/to/input.pdf is good magic). It … Continue reading

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WNR3500L Repair

Some years ago the KAOS lab bought a number of Netgear WNR3500L routers to use as network glue. A pair of them have been in constant service since 2011 in the lab and machine room, and both of those died … Continue reading

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chdk-ptp PKGBUILD

In another episode of fixing things for the Cameras as Computing Systems class I’m taking, I made a PKGBUILD that apparently correctly builds and installs chdk-ptp on Archlinux systems. Chdk-ptp is a tethered-control application for Canon cameras running CHDK, that … Continue reading

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Makergear M2 Heated Bed Issue

There was a problem with the Lab’s Makergear M2 recently that is worth writing up. Last weekend, we had it off site for a demo event for a group of highschoolers interested in engineering and medicine, which included assembling samples … Continue reading

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As a quick “look at me being a good citizen,” a “class projects sometimes do have positive externalities,” and so that I have a convenient pointer/local copy, I just touched up the script for building a GCC 4.5 toolchain suitable … Continue reading

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N109 Thinkpad AC Adapters

Since I’ve been documenting failure modes in electronics, another tale of electronic woe regarding N109 type knockoff Lenovo 90W AC adapters. I have a couple T series ThinkPads, which conveniently all use the same 20V 90W supplies with the same … Continue reading

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Thrunite T10 Repair

The Thrunite T10 light I’ve been carrying failed to come on when I reached for it the other day. It wasn’t a dead battery, and, yesterday, I determined that the 24mo warranty offers free repair contingent on you paying for … Continue reading

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Shapeoko: Part 6

I’ve been working on my Shapeoko in little fits and spurts that individually haven’t been terribly documentation worthy, but in aggregate are pretty interesting. Continuing from where I left off in Shapeoko: Part 5, I’ve iterated a bit on belt … Continue reading

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Adventures in 3D Printing

The MakerGear M2 3D printer the KAOS lab ordered arrived last week. I am thoroughly impressed with the machine and how little fussing has been required to get decent prints out of it. I’ve been pushing annotated pictures of our … Continue reading

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Shapeoko: Part 5

This was originally posted as Shapeoko: Part 6, because I apparently can’t count. A while ago I ordered a 300W ER-11 DC spindle kit from China to install in my Shapeoko. I finally got to the post office yesterday (stupid … Continue reading

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