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 My old and my new power tool. About 9 1/2 years, two moves and renovating one kitchen – this is how long I was able to enjoy my power tool “Alpha Tools BAS 14,4-1” from Bauhaus. I guess that’s even more than I could have expected from such a no-name – oh, […] Continue reading Time for a new power tool Ever seen a seemingly ok, quite new 24″ Syncmaster SA300 LCD monitor from Samsung – which refuses to show an image, but can display its own system messages? Try a firmware update! I found this solution in the PC Help Forum. A firmware update for a computer monitor you wonder? Yes! Obviously you need […] Continue reading Dark Samsung?  …at least if you don’t know which resistors you have in stock and where they are. For a long time we kept resistors in their original cardboard boxes In our student labs – futily trying at least to sort the boxes according to decades of reistance values. An assortment cabinet labelled for […] Continue reading Resistance is futile  I am a big fan of solderless breadboards and we use these also for our students at Uppsala University. For quite a while I have been using solid-core wire for my connections, but then I discovered the more flexible breadboard wires which have become popular in the Arduino community. A typical […] Continue reading Good and bad wires  (see also my recent appendix to this topic: Hacking an AVR programmer II – especially if you have an ATmega88-based programmer!) On eBay I recently purchased a set of cute small USB AVR programmers which I intend to use in the course 1TE663 Microcontroller Programming at Uppsala University. MK-USBISP-V3.00 programmer in an […] Continue reading Hacking an AVR programmer  Ok, let us continue the reverse engineering of the E27 LED bulb LEDARE from IKEA. After describing the actual light emitting diode assembly in the previous post, I will today look deeper under the hood into the power supply. Disassembling the socket of the clear E27 LED bulb LEDARE from IKEA to […] Continue reading The best LED bulb? – part 2  At least the best one I have seen so far. After giving a lecture on LEDs yesterday I finally unpacked and tested my latest buy – the clear E27 LED bulb LEDARE from IKEA. The clear E27 LED bulb LEDARE from IKEA. (Image linked from IKEA’s homepage.) The specs of this LED bulb […] Continue reading The best LED bulb?  The Atmel STK500 development board does support many but not all of Atmels AVR controllers. As an enhancement a STK505 unit was constructed by Atmel to support the ATtiny24/44/84 series of microcontrollers, which come in a 14-pin DIP package. Other plugin-boards for other pinouts have also been made, but since the STK500 itself is […] Continue reading DIY STK505 replacement  My latest post was about differences within legitimate versions of the same integrated circuit from different manufacturers, today I’d like to write about experiences with supposedly counterfeit components. It has been in the media that the electronic component market is fighting with counterfeit products from the far east. I myself encountered possible indications of […] Continue reading Counterfeit electronics?!  I just wanted to construct a simple constant-current source using a shunt regulator. The shunt regulator TS431 – which I had lying around – is made by both ST and by Taiwan Semiconductor. Both manufacturers use the same component name, the same package and the same description. However, there is one significant difference: […] Continue reading Be careful with manufacturers |
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