You have not used a ball valve for a long time (at least a year). Now you have a need to either open it or close it. But ... to their surprise, they found that the handle could not be turned. Let's try to develop a crane.
Screwdriver bit repair
An easy way to restore a worn screwdriver bit. Extension of its service life.
Flashlight without batteries. Simple scheme.
A simple flashlight circuit that works without batteries. To make it glow, just shake it.
The simplest converter 12 V to 220 V
We supply power to the circuit. Through a normally closed contact, the current will flow through the coil winding and through the secondary winding of the transformer. The relay will break the contact, the power supply to the circuit will stop. The contact immediately closes - the relay coil and the transformer are energized again. The relay will open the contact again.
Test. How to check the battery? How to choose the best?
Which of them will show itself better during operation? Probably the one that costs more. And if we compare one price category? I would like to have the highest quality product for less money.
Vintage appliances. What were they
Photo of old appliances from the beginning and middle of the 20th century.
Trumpet humor
Did the person who designed this enterprise pay attention to how some of its components look? Don't you think that this composition looks a bit vulgar?
Building humor. With explanation :)
One of my friends caught fire to buy the 21st "Volga". Long sought to be in perfect condition. Found. According to the announcement at the bus stop. The owner claimed that the car was in perfect condition, the mileage was about 1000 km. How can this be? The car is over 30 years old, and the mileage is so low!
How to build a chimney pipe and increase draft
To connect two asbestos pipes of different diameters, it was necessary to make a coupling - an adapter. On how it was done:
9 inventions with dubious benefits
You know, there are people who are lovers of unity with nature: they eat only organic products, go to all sorts of actions to protect rare African seals and Siberian elephants... Well... There is some advice for
them...
Eight “Popular” Electrician Mistakes
![Eight "popular" electrician mistakes](https://nsk-osb.ru/wp-content/uploads/2020/02/prokladka-1024x633.jpg.pagespeed.ce.NBRGuyDppL.jpg "Eight "popular" electrician mistakes")
Everyone makes mistakes, but not an electrician. His mistakes can be costly. Consider the most common "jambs" of electricians.
Living and dead water Homemade device
Description of the home-made scheme of the device for the preparation of living and dead water. Photo and video.