Do you have a couple of old telephones in your pantry? - No need to throw them away - make a very simple intercom from them - an intercom. With it, you can establish a wired connection to hundreds and even thousands of meters. All for free and

There are quite a few examples on the Internet how you can restore a dead screwdriver battery without even opening it. I just have two batteries lying around that cannot be charged, even if they are charged all night. Recovery method i

The chemical power source that will be manufactured in this master class has quite substantial power to get a voltage that can power 220 V network devices with it. Surely you saw articles on the Internet where

Once I saw how the sun's rays, refracting in a glass bottle of water, give the impression of a magical light source. There seemed to be a little sun in my bottle. I was so fascinated by this sight that I began to puzzle how

Everyone who has a uninterruptible power supply (UPS) for the computer at home knows its one significant drawback, which flies to its owner “a pretty penny”. This is of course the fragility of its batteries. Usually, with luck, they live 3

An adjustable power supply is the right thing. In general, I think there should be a sufficient number of power supplies. It took the father, for small needs, an adjustable power supply. Having studied their deposits, a number of components were accumulated. I decided to collect

Keeping your “swallow” clean is a normal desire of all cars and motorists. But what if there is no water tap or hose at hand? No problem! A stand-alone wash with lithium batteries will help. With the help of it you can wash the bike, motorcycle,

Excellent use of wood waste - the manufacture of fuel briquettes. They allow you to cope with the ever-increasing number of shavings, sawdust from work in carpentry workshops and garbage in the household. What is usually thrown away or burned,

I’m sure that at least once in your life you needed a portable 220 V generator. With the help of it you had to power something in conditions where a regular network is not available. In general, a gasoline generator in itself is an extremely useful thing and will come in handy

In this article, we will look at how to make a charger for a mobile phone on a solar battery. This device is easy to manufacture, has a low weight and dimensions, but performs a very useful function.It will become an indispensable assistant.

In this master class we will consider the creation of an electric pump for pumping the wheels of motorcycles and bicycles. The main advantage is that the pump is powered by a built-in battery and is small in size. Its construction is such that

In this article I want to share with you my experience in creating switching power supplies. We will talk about how to assemble a pulsed power supply on the IR2153 chip with your own hands. IC IR2153 is a high voltage driver

To quickly wash a car, a window at home, to clean the grill with a jet under pressure - there is nothing easier when using this home-made mini-sink. It runs on a built-in battery and can be used anywhere. Just pour powerful

Using this drive with manual recharging, you can start the car engine when the main battery is low. In addition, this device can power various inverters with loads, LED lamps, charge smartphones, etc. It

This is a full-fledged and real air conditioning, unlike those that are provided in large numbers on the Internet. There are no bottles of ice water, nor ice itself. And the principle of operation is quite similar to household models. I’ll say more, that earlier, on

The case of the laptop power adapter is glued in two parts with special glue and does not have any other fasteners. If an accident happened, and the power supply is broken, then for its repair it must first be disassembled. And how to do it if he

In places without electricity, there is a problem with recharging smartphones and other equipment. The use of a paverbank is only a temporary measure. It is much more reliable to get a free alternative energy source. In its quality, a homemade

With the help of this small pocket generator, you can immediately charge not one but several cell phones, light an LED lamp, and other applications that may not have occurred to me are possible. It produces a pure sinusoidal

A supercapacitor or ionistor is something between a battery and a conventional capacitor. It has many advantages that the battery does not have. Therefore, I will introduce you to a fully working prototype battery for a car on

In electronic equipment, an electronic switch is part of the control device. It can be household appliances such as: TV, microwave, monitor, computer, amplifier, etc., as well as industrial appliances, units

Surely, when working with batteries to replace them, you needed resistance welding. Since lithium-ion batteries are very undesirable to solder with ordinary solder, there is a danger of overheating. Buy or craft expensive equipment for two or three

Hello! My name is Max. Today I want to tell you how to build an enclosure for an acoustic speaker from an old tire.Thoroughly wash the tire from dirt using a brush and detergent.

A supercapacitor (aka an ionistor) is almost the same capacitor, only of high capacity, comparable to a battery. I made a 12 V battery from such ionistors, which can be used in various devices. And she will serve longer in

There was a need to charge the car battery. You can take the LBP, but I use it in the workshop. I decided to assemble a charger for the garage. Thinking over the design, I decided to stop on the alteration of the computer BP