Welcome! I am an engineer, programmer, designer, and gentleman. You may be interested in some of my electrical and mechanical projects. Take everything you read here with a grain of salt and remember to wear your safety glasses.

Capitulation to Connectedness

The rumors circulating among my friends and family are true: I have laid down arms and ceased resistance to Facebook. On January 29, 2014, I became a node in the Social Network. Like so many before me, I like to think that I'll profit from this alliance more than will the network itself. Time will tell!

Quantifiable Goals for 2014

Instead of making New Year's resolutions, I've written up some quantifiable goals for 2014 as a motivational tool; this is an idea that came to me via Brian Brushwood (although probably he didn't originate it himself). I did this last year as well, but in 2014 I'm publishing them openly here, hoping to use social pressure to exert some extra leverage against indolence and inertia.

Here's the list:

  • Complete one 5k footrace
  • Earn Fechter rank in HEMA
  • Do 10 pullups in a set (I can do about 3 at present)
  • Do 100 pushups in a set (I tested at 21 at the beginning of January)
  • Do 200 situps in a set (right now I'm at 50–60)
  • Add five new videos to Youtube
  • Launch three new web projects
  • Add five significant projects to my personal site
  • Add eight artworks to my personal site
  • Post 24 new blog entries
  • Launch my crowd-funded project (of which more anon)

I'll be updating this with additional blog posts quarterly, to keep myself on track.

Driving a Playstation 3 Fan

Lately I've been elbows-deep in some broken Playstation 3's and found myself wanting to test their cooling fans. These have a three-wire header with leads colored brown, black, and gray; you may be tempted to conclude that this is a brushed DC fan with a tachometer lead, but you'd be wrong. These are brushless fans, and the third wire is a PWM signal that you supply to control the speed of the fan. The two PS3s (both “fat” style) I've opened recently have compatible fans from separate manufacturers; one is a Nidec G14T12BS2AF-56J14 and the other is a Delta Electronics KFB-1412H.

Nidec and Delta models

It's not trivially easy to find datasheets for these fans, but no matter. If you just want to test them or need a good centrifugal blower for one of your own projects, do the following:

  • Apply 12 volts across the brown and black leads; +12 V on brown with return on black. The fan will probably jump a little but it won't start spinning.
  • Drive the gray lead with a TTL-level pulse train at 25 kHz from a signal generator or 555 timer circuit or microcontroller or whatever.
  • Control the duty cycle of this pulse train to adjust the speed.

That's it!

Repairing My Audio-Technica ATH-ANC1

I withdraw my endorsement of Audio-Technica's ATH-ANC1 headphones.

Fatigue failure of first one, then the other earphone support

Barely a year after I bought and first wrote about them, one earphone broke free from the headband; when I temporarily fixed this with electrical tape I was rewarded with about two weeks of additional service before the other earphone failed in exactly the same way. More galling than Audio-Technica's lack of attention to fatigue design, however, was their lack of attention to customer service—representatives of the company refused to make any replacement parts available and, since I was just outside of the warranty period, insisted I send them my headphones and pay more than half the price of a new unit to have them repaired. Nonsense!

Instead of dealing with Audio-Technica anymore, I took this as an opportunity to try out a technique I read about in Make magazine: fixing delicate plastic parts, such as the broken bridge of an eyeglass frame, by wrapping the joint with thread and coating it in epoxy, making a kind of thread-reinforced composite.

Illustrator Template for Avery 5195 Labels

I needed labels for a small prototype run of a new product recently; lacking time to have these professionally made I bought some Avery-brand mailing labels and printed them myself on our color laser printer, finding that with careful design and a decent printer this type of label can produce surprisingly good results.

These 5195-type labels are 0.66 by 1.75 inch; 60 pieces come on an American letter-size sheet of backing paper. Avery provides templates for their label products in Microsoft Word format, which of course isn't good enough. I built a template in Adobe Illustrator instead and laid my design out on that grid. Because there's a small chance someone else in the world will find this useful, I'm writing this blog post and providing the AI template for download here.

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