A motley collection of ideas
I needed a compact power supply capable of providing roughly 5–20 V DC and 12–16 V AC. Because an AC output was required, I chose a conventional transformer—similar to those used in alarm control units and intercom systems. This project was inspired by the Chordless Lab Power Supply on Thingiverse. DC Section The DC side is quite simple: a … Read more
Back in early 2020, the media was buzzing with what we could call the E10 panic. Article after article warned that “the new fuel will ruin your ride.” For some reason, people seem to love being scared—apparently Hitchcock just doesn’t cut it anymore, and EU bureaucrats are now scarier than The Birds. Under the Kyoto … Read more
When a layperson first encounters the TOZ–35, two things immediately stand out. One is the sheer size of the firearm: the barrel length is 300 mm — almost rifle-like. The other is the massive walnut grip that completely envelops the shooter’s right hand. It has to be slipped on like a glove, providing a secure … Read more
The mildew stain is very ugly and does not come out of the clothes when washed. But things can be saved if you know how to do it!No need to throw away clothes with mould stains! Small mould stains can be removed at home, but if you have larger, stubborn stains, it’s worth going to a dry-cleaning specialist (if you can find one who still knows how). Be careful with the practices that are circulating on various gossip sites! The use of strong detergents in particular can easily lead to completely ruining an otherwise salvageable garment. And if the mould fungus has really got into the fibres of the cloth, there is no other way to help but with vinegar scissors…
The phenomenon of resonance has many examples in physics, engineering, and everyday life, and the reed frequency meter is one of them. Surprisingly, such instruments are still in use here and there, although they are certainly considered rarities today. I picked up this specimen, manufactured in 1961, for a few coins at a swap meet. … Read more
My better half has a weakness for weather stations, and she especially likes this old piece. It’s not particularly smart, not particularly pretty, but it has a “frog”, which makes up for everything. It’s a cheap LIDL model — even the first one we bought didn’t pick up the signal from the external sensor. They replaced … Read more
It’s well known that bats use their sonar to navigate their surroundings with remarkable precision. As part of this ability, they emit powerful ultrasonic sounds that are characteristic of each species. These sounds are inaudible to the human ear, but with a simple device, we can detect them — which can be great fun and … Read more
This stairwell lighting timer switch was rescued for me from a building by a friendly electrician acquaintance of mine, Sándor Auffenberg. It had been removed because it was “misbehaving,” but it later turned out to be perfectly fine. According to its label, it was manufactured in 1991—so it’s 30 years old… I’ve written before about … Read more
In 2014, the Csepel spark telegraph station turned one hundred years old. The equipment transmitted messages from both Béla Kun and Lenin. I decided that for the 105th anniversary, I would build a spark transmitter myself. Csepel spark telegraph radio station The construction of the Csepel spark telegraph radio station, which marked the beginning of … Read more
Format: EPUB. You can purchase it on Like.fi The Hungarian edition was published by Typotex Publishing Ltd. in 2021 and can be purchased at Typotex. You Are Never Alone! There are always guests inhabiting the human body—perhaps the most unsettling realization that most of us would rather ignore. A person can carry over 100 different … Read more