October 2011 Archives

Happy Halloween!

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Halloween_2011.jpgIn the picture Tempe Town Lake at dawn with three carved pumpkins and three wild cats.


Bridges

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PA221817.jpgLatest addition to Tempe Town Lake is a pedestrian bridge connecting south and north shore of the man made lake. The costs of about $5 million we paid mainly with federal money. The four spans of 228 feet are suspened by 32 cables. Canvas shades stretched at arch intersections mirror the roof of the Tempe Center for the Arts.

A little earlier from the bridge looking east.
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More Star Trails

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Star_Trails_03.jpgand they turned out nicely this morning so it's ok that I didn't catch any Orionids.

Oh no...

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Down the street a water mains burst spewing mud everywhere and also creating a sinkhole. At least it's not so hot anymore that the whole street would get caked with mud and cars cemented to the road.

More Bread.

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So I kept feeding my sourdough starter since last baking and it's been happily bubbling along since then. Which means time again for some more bread with slight modification in ingredients.

2 cups of sourdough starter, 4 cups King Arthur whole wheat flour, 1 tbsp instant yeast  and about 1 tbsp honey dissolved in 1/2 cup water. Spices: About 1 tbsp each of anise, fennel, caraway and 1 tsp coriander and about 1 tbsp salt and 1 cup of soaked wheat berries. Let rise for about 40 minutes and bake for about 1 hour at 375 ºF.
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The sourdough starter seems to be getting better with time, the bread is more fluffy and has a nice chewy texture with more prominent sourdough flavor.

Vacuum Tubes.

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Tube_Amp_02.jpgSince I'm working on vacuum thermionic energy conversion in my research I thought it might be cool to actually use vacuum electronics for a device, i.e. build a vacuum tube amplifier. Pete Millet's site has great and detailed instructions for different audio amplifiers one can build.
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The vacuum or electronic tubes I used (13EM7/15EA7) were made by General Electric probably 40 years ago and are still working. One tube houses dual triodes. Another key component of the amplifier is the transformers, they are new and made by Edcor Electronics, our state neighbors in New Mexico.

It's a fun project and working great, especially as headphone amp. Since I don't have an analog music source I use flac format of some vinyl rips which sounds pretty awesome. And the amp with operating tubes looks so rad(iant). haha.

Steven P. Jobs, 1955-2011

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Here's an interview with Steve Jobs from 1982 in InfoWorld.

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Photography

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