Archive for April 2009

Build Your Own Multitouch Surface Computer

Touch interfaces are hardly futuristic at this point, but multi-touch hardware like the Microsoft Surface or the iPhone is just starting to become a big deal. Now it is time to learn how they work and maybe try to build our own. site has published an interesting article called “Build Your Own Multitouch Surface

How big shows are built

Ola Melzig, Production Manager for lights, sound, video and rigging used in 2009 Eurovision Song Contest is keeping on on-line diary of the production. The first broadcasts will be aired between May 12 and May 16 throughout Europe. Because the size of the production the project to build all needed technology and other infrastructure has

Circuitry Snacks

Circuitry Snacks web site at gives tips how to make circuitry snacks! Those snacks look like electronics circuits. If your two favorite things in the world are playing with electronics and playing with food, this site is well worth to visit. The page begins by gathering up appropriate snack-food building blocks and making food-based

Use an old Nokia charger to power 1W LED

Here is one useful trick I invented when looking around the transformers/power supplies I had. NOKIA ACP-7 Europe Standard Charger (Original) has a specification of 230 V, 50 Hz, 4.8 VA. Output 3.7 V, 355 mA. A normal 1W white LED is driven with 350 mA maximum continuous current and typically 3-3.8V voltage drop over

Practical jokes around workplace – part III

I was recently subjected to a practical joke that nearly made me lose my nerves. Me and my dear colleague shared a common workroom in which we worked. One day he had a nice idea and he brought a remotely controllable socket and connected my display to it. When ever he was in the room

Practical jokes around workplace – part II

In many offices they have some PC- and IT-magazines delivered to the coffee room. If you know that your colleague is interested in some specific magazine, wait for the next issue, and do the following… Use the stapler to staple all the sheets of the magazine together and then write a post-it as follows: “John,