This night light has two power sources: a solar cell with a peak output voltage of about 6 V, and a Li-Ion cell with a voltage between 3.7 V and 4.2 V. Three (of four) electronic switches in... Read more
Klaus Jürgen Thiesler’s ‘2-Wire Interface’ was published in Elektor magazine in the form of both basic [1] and low-current [2] versions. Each variant used two transistors and a handful of ot... Read more
The original purpose of this device was to assist in leveling large garden tables on uneven ground. Away from buildings, it is difficult to find any reference points to assist in setting up... Read more
A compass is an invaluable orientation aid, especially when you’re traveling by foot or bicycle. Some smartphones and navigation systems do not have built-in compasses, so they can determine... Read more
These days you can buy various types of LED garlands at a reasonable price. With these, you can illuminate various objects indoors or outdoors with interesting lighting effects. When you use... Read more
The author found that a long-neglected gel battery in a hand-held vacuum cleaner had gone high-resistance. It took some effort to make it usable again, by alternately applying voltages of op... Read more
Elektor is all over the globe, starting out from Holland. The same with bicycles, which are even older. All the way from Åland Islands N60 E20 (check that out), Anders Gustafsson wrote 2 us:... Read more
If you want to operate power LEDs with a truly constant current – which significantly prolongs the lifetime of the lamp – and avoid the power loss resulting from using a constant voltage sup... Read more
Knitting always involves a lot of counting as you have to keep track how many rows you’ve knitted and how many should follow. This can, of course, be done with pen and paper, but it’s more f... Read more
Can high-brightness white LEDs and light-dependent resistors (LDRs) be used to make an oscillator? I decided to have a go. For the experiment, I chose type PGM5516 LDRs which have a relative... Read more
