The prototype unit on perfboard.
Teaching an old bug new tricks
The 78S40 is not one of the most modern switching regulators, together with its small brother the MC34063 it dates back to the 1990's. It differs from the 34063 by…
The day of the city forrest
Today was the Day of the City Forrest (Stadsskogens dag) here in Uppsala. For everyone who didn’t climb the 180 steps up onto the water tower, here is the view from the top (you will need Apple Quicktime to be installed):
"I have a strange feeling that something big is behind us..."
Orienteering in Nacka
Last week I already found 16 of these markers, and today I added another 28 to my list, bringing me up among these week’s rockets on the homepage.
Not all the markers are actually in the forest, some are close to the water. And there you can watch big and small ships arriving in and leaving Stockholm…
At home on my balcony my chili peppers were drowning this morning after 24 hours of permanent rain. On my Bishop’s Crown I noticed a strange flower – actually two flowers with their stalks grown together. I’m curious to see how these will develop into fruits…
Midnattsloppet 2011, me among 24000 runners. Photo © Ulf Bengtsson
Midnattsloppet 2011
Running in the evening through Stockholm – last Saturday it was time again. The 30th anniversary of the Midnattsloppet and my own 10th participation in this 10 km race through the southern part of Stockholm. More than 24000 had registered themselves for this event – what a surprise to find myself on a photo which Ulf Bengtsson has taken from the side of the track:
And these are my results so far:
| Year | start group | start number | placement | time |
|---|---|---|---|---|
| 2001 | 2762 | 0.48.08 | ||
| 2002 | 1694 | 0.46.31 | ||
| 2004 | 2471 | 0.49.11 | ||
| 2005 | 1560 | 0.46:51 | ||
| 2006 | 1636 | 0.46:29 | ||
| 2007 | 1c | 2882 | 2746 | 0.48.31 |
| 2008 | 1c | 1708 | 3364 | 0.49.09 |
| 2009 | 7 | 19237 | 3626 | 0.50.07 |
| 2010 | 1c | 1682 | 2452 | 0.49.48 |
| 2011 | 2b | 7290 | 3838 | 0.49.39 |
Testing qTranslate
From the start I wanted to have a multilingual blog, since I am multilingual in my daily life here in Sweden. I found a WordPress plugin called WPML for this purpose, but the makers of this plugin decided to commercialize it and now they want to have money. Since this blog’s contents is for free I also want to use free tools and I stuck with the last free version of WPML.
However, today I encountered problems with the way comments are handled in WPML and I started to look for alternatives. There are several plugins available, but I decided to give qTranslate a try.
LTspice simulation results of the LED driver circuit
Nice multiplots in Gnuplot
Multiplots are supported by Gnuplot, but I wasn't satisfied with the output of the automatic routines - so I wrote my own template with placement functions. [ Read More → ]
Standard LED driver
Do they know what they do?
As you can read in my earlier posts I have become quite attached to the AVR microcontrollers from Atmel. We also use these microcontrollers in projects with our students at…
2011 Digikey's new catalog
The new Digikey catalog is here!
Today I got the new Digikey catalog delivered at the university. It must be the season, during recent weeks also Elfa (you remember: the company which delivers cable by the…
semi-conducting wire
Troubleshooting against all odds II
The hot wire mystery I like to build my prototype electronic circuits on perf- or stripboard after having tested it on a breadboard. Actually I would have loved to have…