LED lamps are (not) forever
Two weeks ago I wrote about my experience with special price offers for LED bulbs at Bauhaus. What I didn't write was that I then just went to the other…
Which direction are the black and white balls moving?
Optical illusions
On National Geographic there is right now a science show called Brain Games. Even though a lot of the contents is not new, there was one optical illusion which really fascinated me:
Look at the full image, look at the red circle, look at the yellow circle…
(image found at Mighty Optical Illusions)
My very own AVR ISP adapter on a breadboard.
AVR ISP breadboard adapter
Breadboards are great! I mean the solderless breadboard type which you can get everywhere now for almost no money. I use them all the time to prototype electronics circuits and…
Special offer on LEDs at Bauhaus: new price twice as high as before!
special offer at Bauhaus
Today I was at Bauhaus in Uppsala, just browsing, not looking for anything special. Close to the exit there was a table with LED light bulbs which were obviously taken out of the regular assortment and re-labelled with new prices.
Usually you would expect a bargain – and since I am somewhat sold to LED light bulbs I had a close look.
Well it was not worth the looking – these were still quite overpriced as compared to the average shop price, not to mention the internet price. but then I saw one very special offer:
The final board on a breadboard for testing. The bits are controlled in the background by a dip-switch.
Do you need a byte?
My latest Instructable is on the design of a breakout board to view the state of up to eight bits in a breadboard circuit. I don't fell I have the…
Upgrading a RAID-1 Ubuntu-server
It's almost 4 years now since I installed my server and I decided it was time for some new (bigger) harddisks. I wrote about my server earlier in my blog,…
PISA – what’s wrong with Sweden
The Swedish education system used to be a good example, but looking at the new PISA results, Sweden is among the countries with the strongest deterioration in school education in reading, mathematics and science. The only thing Sweden has achieved is to narrow the gap between top and low performers – obviously by lowering the overall average.
It is also notable that in spite of worse performance the belief of the students in their abilities is increasing in Sweden.
I cannot say that I am completely surprised by these findings…
(Internal server error? – Try again in a second, the PISA server appears to be heavily loaded right now.)
Measurement circuit for the electrical characteristics of a MOSFET.
MOSFETs – what the datasheet doesn’t tell you
[latexpage] I am planning to construct a logarithmic current meter and were yesterday doing some simulations with LTspice. Using a logarithmic converter you can span a wide range of currents…
Pandora’s Promise (The movie)
Yesterday I had the opportunity to watch a screening of the movie Pandora's Promise at Uppsala University. After the movie there was a panel debate including the director of the…
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