Electronics. Page 12

There is no universal soldering iron that can solder both twisted wires and SMD components with equal quality and convenience. There is an ideal device for every task. Some of them you can literally do yourself.

A highly sensitive detector will show not only the presence of life-threatening high-voltage voltage nearby, but also the presence of static. The device differs in that it shows the polarity of the charged field using two multi-colored LEDs.

A powerful LED lamp will be an excellent helper in difficult situations during a power outage. It can be assembled simply and cheaply from ready-made modules. Built-in, rechargeable batteries are enough for several hours of continuous operation,

The microwave oven has a very powerful transformer, which can be used in a homemade charger for 12 V car batteries. Let's rewind the transformer to suit our needs and assemble the charger.

An old cell phone battery can still serve you well and be useful. The battery itself may no longer be charged due to the past years, but it has one useful thing that will more than last for many more years. The fact is that the batteries of almost all

Making a Power Bank with a capacity of 5000 mAh is very simple. Everything will take no more than 15 minutes. The body is made of a disposable syringe, and the filling is an updated 18650 series battery with increased capacity and a new

To determine the presence of high voltage 220 V in a conductor and more, you can assemble a simple tester in the marker body. Using this device, you can determine the conductor break and the presence of a phase. Great homemade product for beginners

This active flux recipe is considered one of the best among homemade liquid or gel soldering fluxes. It is non-toxic and has moderate activity in tinning contaminated and oxidized surfaces. The most important thing is that it contains only

Chinese pulse sources in a metal case are very often used by radio amateurs. They have proven their reliability and good price/quality ratio.But what if you suddenly need a unit with a different output voltage? Let's say

In fact, an induction cooker is an extremely simple device. Even a novice radio amateur can make a fully working prototype. Here is a great example to repeat: a simple circuit that does not contain any microcircuits,

Lead-acid batteries are not as capacious and durable as we would like. One of the advantages of their use in motorcycles is their operation at low temperatures. But usually scooters and mopeds, where similar batteries are used in winter and not

Sometimes you have to repair computer power supplies. Checking the idle voltage is not enough. Also, to check the power supply, it must be turned on through a protective light. I decided to combine the safety light and the load in one

A “long-lasting” flashlight is a necessary thing in any household. It will help during a power outage and will be a faithful assistant when working in places with poor lighting. Its design is simple and uncomplicated. It is built on common

Summer is coming soon. There are more and more sunny days. Travel awaits everyone. And it’s just great if you have an external battery that can be charged from sunlight. You can always stay connected and charge other USB

Despite the abundance of measuring equipment, I always use a simple homemade tester made from a ballpoint pen. It allows you to instantly find out the polarity of a unit, battery, source, etc. Does not require power and is always ready to work.

If your 12 volt acid battery has failed, you can replace it with a new one from an old laptop battery. Li-ion batteries in some cases have advantages such as current strength and capacity. In fact, they are used

You don't have to buy an expensive regulated power supply for your home lab. You can simply make it yourself from an existing 12-volt pulse adapter. Even 9 and 6 Volt units are suitable, the only maximum voltage is

A broken cable often occurs when repairing electronic devices. It is not always possible to quickly buy and replace it. Sometimes it’s faster to repair and restore it yourself. The matter here is not tricky, but it will require some skill.

To quickly and reliably solder pipes and radiators, you need a high-power soldering iron. It can be made from a microwave transformer. Such a device is capable of almost instantly heating the metal red-hot.

In order not to buy an expensive charger for discharging various batteries, you can assemble a universal charger attachment for your laptop power supply yourself. This set-top box can also perfectly serve as an adjustable power supply of 1-19 Volts.

An LED lamp consumes several times less energy compared to an incandescent lamp. And for a small glow of LEDs, only a few hundred microamps are enough. Therefore, very often you can notice the glow of an LED lamp after turning off.

18650 series batteries are one of the most common and frequently used batteries. They are used in flashlights, radios, metal detectors, etc. Radio amateurs have not ignored them and also use them wherever possible. Often

Control via GSM channel of four actuators (expandable to 8). The command is sent via SMS from your phone, and after it is triggered, a response SMS is sent to your phone. The block is built on a combination of the AT90S8515 microcontroller and

A welding machine has long ceased to be a transformer weighing 40 kg, which is difficult to move. Progress does not stand still, and on sale you can already find miniature 3-in-1 devices that can work as semi-automatic, regular and