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 Transatlantic recently asked about a new IKEA LED lamp, the LEDARE with 1000 lm. It comes as a quite big globe (diameter 95 mm) with an E27 socket, an electrical power rating of 16.5 W and is supposed to be dimable! Transatlantic commented on the high quality of the warm-white light output and wondered […] Continue reading That’s bright!  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 side of the street – well almost – and bought a 2.2 W E14 LED bulb at Jula. 2.2 W E14 LED […] Continue reading LED lamps are (not) forever  My very own AVR ISP adapter on a breadboard. 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 have been forcing my students to do the same. Most of my current […] Continue reading AVR ISP breadboard adapter  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 […] Continue reading special offer at Bauhaus  You can get everything on eBay, but I have not found a breakout board to visualize a byte on LEDs. 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 time to […] Continue reading Do you need a byte?  https://www.sciencetronics.com/greenphotons/wp-content/uploads/2013/12/5x7_led_weihnachten.mp4 https://www.sciencetronics.com/greenphotons/wp-content/uploads/2013/12/5x7_led_xmas.mp4 https://www.sciencetronics.com/greenphotons/wp-content/uploads/2013/12/14seg_xmas_500bps1.mp4 https://www.sciencetronics.com/greenphotons/wp-content/uploads/2013/12/14seg_weihnachten_500bps.mp4  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 with a single readout without the necessity to switch ranges. Of course this has disadvantages as well, but if you know what you are doing […] Continue reading MOSFETs – what the datasheet doesn’t tell you Samsung Syncmaster 913TM with its unique swiveling stand I recently got hold of another broken Samsung monitor. This time it is a Syncmaster 913TM which is characterized by its swiveling stand, which allows the screen to be rotated by 90 degrees. I would not call this “portrait” as opposed to landscape, because […] Continue reading Repairing a Samsung Syncmaster 913TM Every place in our course laboratory is equipped with an analog oscillsocpe and a Metex Universal System. This instrument consists of a power supply with two fixed and a variable outpur voltage, a multimeter, a function generator and a frequency counter. This sounds nice and it usually is – most of the time the […] Continue reading Notes from the student lab A good question was brought up by my students in the lab exercise in the course Electronics I yesterday: What actually makes the cut-off frequency of a filter circuit (1st order) so special? Why do we look out for a point which happens to be located or a factor of under the amplitude of […] Continue reading About filters and cut-off frequencies |
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