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 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 having an additional, uncommitted operational amplifier inside its 16-pin package. There are many application notes available, since both chips are manufactured by several companies. […] Continue reading Teaching an old bug new tricks 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):  Marker number 38 in Nacka, but what might the letter be? Last week before running the Midnattsloppet I spent the day in the forests of Nacka, just south of Stockholm. Like Uppsala and several other places in Sweden, there is an ongoing tournament in orienteering in this part of Stockholm. Currently 75 numbered […] Continue reading Orienteering in Nacka  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 […] Continue reading Midnattsloppet 2011 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 […] Continue reading Testing qTranslate  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. Continue reading Nice multiplots in Gnuplot  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 Uppsala University. Probably one of the widest spread development tools for AVR controllers is the original STK500 starter kit from Atmel, which in principle […] Continue reading Do they know what they do?  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 metre…) and RS-Components have mailed their new paper catalogs. I still prefer paper catalogs in spite of their environmental impact, because there is simply […] Continue reading The new Digikey catalog is here!  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 breadboards around when I started with electronics some 25 years ago, but it was not before the late 1990s that I got familiar with […] Continue reading Troubleshooting against all odds II |
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