It is hard for an outsider to understand anglers who sit all day, as if hypnotized, with a fishing rod, never taking their eyes off the float. Of course, patience eventually runs out even for the most devoted, especially if the fish does not often reward them with bites. That is why many experiment, trying Read more…
When I needed a megaphone, I looked at the prices of industrial Chinese products: as it turned out, they cost from $45 to $235, and I decided that I could assemble a similar device with my own hands in a couple of hours. A megaphone (or loudspeaker), the electrical circuit of which I recommend and Read more…
If you’ve already put a couple of solar panels on your balcony and gotten used to the fridge and laptop running on “free” sunshine during the day — congratulations, you’re halfway to real autonomy. But at some point almost everyone hits the same ceiling: a standard 3–5 kW inverter handles lights, phone charging, and the Read more…
The welding apparatus I built is a modernized version of a device that has proven itself well in practice; its description and sketches were published in the magazine Modelist-Konstruktor No. 3, 1966. The main point is that the new “welder” is significantly more powerful than its predecessor, and simpler to build and operate. Without any Read more…
In large apartments and private houses, it is difficult in the evening and at night to walk along dark corridors or stairs and find the switch by touch to turn on the lighting. There is also an alternative — to buy autonomous “soft light” fixtures; they can be installed anywhere convenient for the owner. However, Read more…
Research by scientists and beekeepers’ experience show that with adequate quality feed and careful management, flying honey producers tolerate wintering well even in severe frost. For a weakened bee colony in cold weather, the trouble is less the low temperature than high humidity, when frames and the inner surfaces of hives grow mold, and the Read more…
I offer readers of our favorite magazine an automatic plant watering and spraying system of my own design, which has proven itself both indoors and in a greenhouse, winter garden, and flower bed. It consists of two interconnected subsystems: “sensor — water supply” (fig. 1) and an electronic control unit (fig. 2). While the first Read more…
Summer vacation time is approaching. To the numerous concerns related to preparing for the upcoming vacation, aquarium owners have one more: how to provide everything necessary for the underwater inhabitants during the owner’s absence. If you have no one to entrust your aquarium to, entrust its care to an automaton (Fig. 1) and rest peacefully. Read more…
Smartphones look similar on the outside, but the real changes are inside. iPhone 17 teardown — a journey into Apple’s engineering kitchen. Engineers worked hard: fixed old problems, made bold moves. Teardowns help understand “how it’s made” — how long the device will last, how it will survive drops, how painful battery replacement will be. Read more…
A compact incubator in which you can hatch turkeys and chickens, ducks and geese, operates from an AC power supply. The design automatically maintains the required temperature: chicken and turkey eggs are cooled twice a day, and waterfowl eggs — four times. In addition, the machine turns the eggs 180° every hour. If something fails Read more…
