2 590 ₽
Show phone
Ring-shaped LED lamp + tripod. New. There is a guarantee and delivery in Moscow.
A very useful tool for everyone!
For a make-up artist or lashmaker (eyelash master), beauty salons: The lamp provides uniform illumination and a complete view. The light of the ring lamp emphasizes the texture of the skin, perfectly conveys the shades of makeup and hair color.
For a blogger or photographer: with the help of such a lamp, you can take cool selfie photos, stream, record videos for a vlog or Instagram. The lamp gives high-quality, professional lighting and is unusually reflected in the eye.
As an unusual interior element, a round lamp: in addition to its main professional functions, such a lamp also looks great as an original lamp for a home or a beauty salon.
Control:
1. Adjusting the color temperature will allow you to choose the right type of light for a specific photo or makeup color
2. By adjusting the brightness, you can choose the right power without moving the lamp
3. The ability to adjust the tilt of the lamp by 90 degrees and the height of the tripod up to 2 meters
The kit includes:
1. Light ring
2. Mains power supply
2. Tripod 2 meters
3. Phone holder
4. Bag cover (to the lamp 35 cm.)
5. Remote control (for 32 cm lamp)
Characteristics:
Power: 48W, 180 to 480 LEDs. Diode life 50,000 hours
Outer Diameter: 20 to 46cm
Weight: from 1.8 to 3.6 kg.
Lamp sizes:
1) diameter 25 cm + tripod. Powered by usb (you can take it outdoors and turn it on from a power bank)
2) diameter 32 cm + tripod (control from a wireless remote control, powered by a socket)
3) diameter 35 cm.
4) diameter 50 cm + tripod + smartphone mount + bag - ideal for professional studios and anyone who needs the most powerful bright light
Bluetooth remote control for an additional fee - 190 rubles (controls the phone. With it, you do not need to hold it in your hands or reach for the phone)
Also, you can buy ring lamps in bulk from us.
Delivery in Moscow - TODAY, by courier to the address
- Pickup - showroom in the very center of the city, near metro station Lubyanka
- Delivery to the regions Avito-Delivery
- Warranty for all goods
Any person at least once in their life has encountered an untimely discharged battery of an urgently needed electronic device, and for many of us such a nuisance catches up regularly.
The way to solve the problem is simple - you just have to get a compact external battery, recharge it in a timely manner and do not forget at home when going on business. We offer you a rating of the best external batteries in 2018 - the first half of 2019, compiled from reviews of experts and ordinary buyers. Just do not forget - to choose the best external battery, you need to realistically assess your needs and choose a device of optimal capacity. As a first approximation, its value should be twice as high as the corresponding battery indicator of the gadget, which is supposed to be charged most often.
External battery capacity - what does it mean
Indicating the nameplate capacity for their external batteries, manufacturers write the truth, but not all. For example, those 13,000 mAh claimed for the Canyon CNE-CPB130, its built-in battery really has. Only now it will be possible to fully charge a smartphone with a 4,000 mAh battery with such a power bank only twice. The fact is that the nominal capacity here means the energy reserve accumulated by the battery of the device at its operating voltage. In this case, it is approximately equal to 3.7 volts, which is significantly lower than the value determined by the USB specification. And insofar as it is necessary to charge mobile equipment through this particular interface, the internal voltage is converted to the standard 5 V with a proportional decrease in the available capacity. In addition, part of the energy is spent on the operation of the corresponding electronic circuit. For reference: at present, external batteries use lithium-ion (3.6-3.7 V) or lithium-polymer (3.85 V) batteries, and the efficiency of the converters ranges from 0.9 to 0.95.
Thus, knowing the “capacity” of the batteries of a power bank and a smartphone, it is easy to calculate how many times you can charge the first device with the second. To do this, the passport value of the capacity of the external battery must be multiplied by the operating voltage of its own battery (if the type is unknown, we take 3.6 V), divided by 5 volts of the USB interface, and the result multiplied by the efficiency (laid by 0.9). As a result, we get the useful capacity of the device, which can be used when charging.
To complete our example, we have (13000 * 3.7 / 5) * 0.9 = 8658 mAh, which is enough for two full charges of, say, Xiaomi Redmi 4X with its 4,100 mAh battery. And a little more will remain "in reserve".
Modern mobile devices and all kinds of gadgets are equipped with many fashionable and useful features and applications. Yes, and the most complex mobile games amaze with graphics and capabilities. It is thanks to such applications that any smartphone "sits down" almost during the day. Therefore, you need to learn how to choose a more powerful one for your phone. Or pick up an extra
The main reasons why you just need to choose a new charger
So, the phone began to discharge frequently and quickly. First you need to decide on the main cause, and only then look for the most optimal ways to solve the problem. So what could be the reasons for early discharge?
If the smartphone or tablet is new, the instructions say a certain duration of work, but in fact, the device works several times less, then the reason may lie in the settings. As a rule, on the phone itself, you can adjust the brightness and energy consumption, or turn off several applications that draw power.
Another thing is if the smartphone is set up, it worked quite normally for a long time, but over time it began to discharge much faster. Here, most likely, the internal charger or the external battery of the phone is to blame. The only solution is to replace the element. To do this, you can use both a proprietary battery and a universal analogue.
Types of external batteries
Despite the prevalence of cell phones and smartphones, there are still only three main types of batteries in the world:
- Li-ion. This is perhaps the most common external battery for charging your phone. It has a more optimal ratio of durability, safety and energy intensity than other analogues. Also, such elements are endowed with a special “memory effect” and are discharged rather slowly. But they quickly age, and even in the case of constant use.
- Nickel-cadmium. Recognized as the most harmful and were put on the shelf. They were used only in the very first phones because of the low cost. In addition, the higher their energy intensity, the higher the physical size.
- Lithium polymer. These are cheaper and improved external batteries for cell phones. Therefore, such elements adopted all the positive aspects of the original sample, and also became more environmentally friendly.
Features of work and operation
A mobile phone is a fairly complex and delicate mechanism. And each of its elements has its own characteristics and requires certain operating conditions, including the battery itself. Therefore, there are several rules, following which, you can significantly extend the life of the telephone battery:
- When using, it is required to strictly follow the operating rules specified by the manufacturer, i.e. do not overheat, do not wet or overcool.
- Try to avoid physical damage to the element.
- External do not endure frequent blows and falls.
- You should not open the batteries yourself for the sake of interest.
- Replace and recharge the battery only when the device is turned off.
- It is not recommended to constantly charge the gadget for a long time (more than a day).
- The more and more often the battery is used, the better.
Myths about mobile batteries
For all the time of its existence, mobile phones have practically acquired a variety of fictions and legends that scare naive users. Several of them touch on their most important detail.
Parameters to pay attention to when choosing chargers
When choosing an additional external battery for your phone, there are many factors to consider (in addition to the manufacturer and the quality of the materials). As a rule, experts identify several main parameters by which these elements differ. Therefore, knowing these features, you can choose the appropriate option.
- The capacity of the presented battery. The operating time without additional recharging directly depends on it. As a rule, 4000-6000 mAh is enough.
- Current strength. If the battery is used to power not only a smartphone, then you need to choose a device with a power of 1-3 A. For a regular phone, a device that produces 1 A is enough.
- Charging method. It is better to choose a gadget that can be powered from several sources at once: an ordinary power supply and via a USB connector.
- Battery indicator. This element is simply necessary in the daily operation of smartphones and phones. There are several options for displaying the charge: by changing the color or numbers. The numerical indicator provides much more accurate information about the state of the battery, but it also costs much more.
- Number of ports used. Thrifty and prudent users choose specimens with the largest number of them. But, as a rule, the need to charge several devices at the same time is quite rare. Therefore, 2-3 ports are sufficient.
A few things to look out for when choosing batteries
In addition to the main parameters that you need to pay special attention to, there are several additional qualities. They can greatly facilitate and extend the operation of the presented gadgets.
It is best to choose an external battery for the phone, on which the power button will not stand out against the background of the case. After all, if you press it by accident, you can get a rather unpleasant surprise. It will also be useful to have a special flashlight in the device to make it easier to find in the dark.
In order to protect a valuable thing from the ingress of all kinds of dust or water, as well as to protect against small bumps, you need to choose devices with a special case. Such devices will cost a little more, but their service life will be clearly longer.
Fans of modern innovative technologies will appreciate the presence of such features as Wi-Fi and NAS Server. With the help of them, you can not only freely use and distribute the Internet, but also save various data on a special memory card.
Useful for any battery and After all, in the summer we are not always near any power source.
To purchase a quality battery that will last long enough, you should approach this issue with all seriousness. Before making the final choice, you need to familiarize yourself with the most common options, compare features and reviews. And only then it will be possible to buy for the phone.
- First of all, this device should be convenient, light and compact enough to fit freely in any bag.
- A charger from the same company as the main device will fit much better than similar counterparts. In addition, in this way you can protect yourself from low-quality goods.
- It is better to clarify in advance whether a return of a purchase is possible, and under what conditions. The charger may simply not be corny.
Comparison of the most common external batteries
There are many external telephone batteries. There are probably as many of them as there are mobile devices themselves. In this case, everyone chooses their external battery for the phone. Reviews are what attention is drawn to in the first place. Therefore, here are some subjective opinions about the most popular models:
- Vampire mini. There is a standard USB connector. It is convenient to adjust the current and voltage. Among the shortcomings - low efficiency.
- boost stabilizer. This battery charges almost all known mobile devices, and can also be charged from any power source. The only drawback is that an external battery pack is required.
- Specialized energy storage device "Proglot". Universal battery. It has a variety of dedicated connectors for all kinds of devices, and the internal batteries can be easily replaced. Minus - in the absence of adapters.
Universal external battery
As the world's all-knowing statistics show, almost every city dweller has two or more mobile devices, as well as a laptop and several other gadgets. Therefore, many seek to purchase a universal external battery for the phone, but in such a way that it fits other devices.
Such a choice allows you to kill several "hares" at once: the ability to charge all available gadgets from one device at the same time, saving money and space. At the same time, the operating rules for such devices are the same as for narrowly focused batteries. In addition, modern stores can offer a huge number of different batteries in terms of price, characteristics and quality. Therefore, it is the best choice for any user.
It is not necessary to buy an additional power source for a smartphone. If desired, and with certain abilities, you can easily make a homemade external battery for your phone.
The most common homemade products are charging from batteries and from the sun. Each of them has its own characteristics. In the first case, you need a resistor, a suitable plug, 4 batteries and a special box for them. The principle of operation is simple - a resistor connects the power supply to the plug and transfers the charge to the mobile device. The downside is that the batteries need to be changed constantly.
In the case of solar recharging, you can simply buy special flashlights that are charged from the sun, and take the necessary elements from there. Further, a circuit is connected by means of a diode, and the structure is refueled into some box.
Hello radio amateurs!!!
Going through old boards, I came across a couple of switching power supplies from mobile phones and I wanted to restore them and at the same time tell you about their most frequent breakdowns and troubleshooting. The photo shows two universal schemes for such charges, which are most often found:
In my case, the board was similar to the first circuit, but without the LED at the output, which only plays the role of an indicator of the presence of voltage at the output of the block. First of all, you need to deal with the breakdown, below in the photo I outline the details that most often fail:
And we will check all the necessary details using a conventional multimeter DT9208A.
It has everything you need for this. The continuity mode of diodes and transistor junctions, as well as an ohmmeter and a capacitor capacitance meter up to 200 microfarads. This set of functions is more than enough.
When checking radio components, you need to know the base of all parts of transistors and diodes especially.
Now all cell phone manufacturers have agreed and everything that is in stores is charged via a USB connector. This is very good, because chargers have become universal. In principle, a cell phone charger is not.
This is only a 5V DC pulse source, and the charger itself, that is, the circuit that monitors the battery charge and ensures its charge, is located in the cell phone itself. But, the point is not this, but the fact that these “chargers” are now sold everywhere and are already so cheap that the issue of repair disappears somehow by itself.
For example, in a store, “charging” costs from 200 rubles, and on the well-known Aliexpress there are offers from 60 rubles (including delivery).
circuit diagram
A diagram of a typical Chinese charge, copied from the board, is shown in fig. 1. There may also be a variant with the rearrangement of the diodes VD1, VD3 and the zener diode VD4 to a negative circuit - Fig. 2.
And more "advanced" options may have rectifier bridges at the input and output. There may be differences in part numbers. By the way, the numbering on the diagrams is given arbitrarily. But this does not change the essence of the matter.
Rice. 1. A typical diagram of a Chinese network charger for a cell phone.
Despite the simplicity, this is still a good switching power supply, and even a stabilized one, which is quite suitable for powering something other than a cell phone charger.
Rice. 2. Scheme of a network charger for a cell phone with a changed position of the diode and zener diode.
The circuit is based on a high-voltage blocking oscillator, the generation pulse width of which is controlled by an optocoupler, the LED of which receives voltage from a secondary rectifier. The optocoupler lowers the bias voltage based on the key transistor VT1, which is set by resistors R1 and R2.
The load of the transistor VT1 is the primary winding of the transformer T1. Secondary, lowering, is winding 2, from which the output voltage is removed. There is also winding 3, it serves both to create positive feedback for generation, and as a source of negative voltage, which is made on the diode VD2 and capacitor C3.
This negative voltage source is needed to reduce the voltage at the base of the transistor VT1 when the optocoupler U1 opens. The stabilization element that determines the output voltage is the Zener diode VD4.
Its stabilization voltage is such that, in combination with the direct voltage of the IR LED of the optocoupler U1, it gives exactly the necessary 5V that is required. As soon as the voltage on C4 exceeds 5V, the VD4 zener diode opens and current flows through it to the optocoupler LED.
And so, the operation of the device does not raise questions. But what if I need not 5V, but, for example, 9V or even 12V? This question arose along with the desire to organize a network power supply for a multimeter. As you know, popular in amateur radio circles, multimeters are powered by Krona, a compact 9V battery.
And in "field" conditions, this is quite convenient, but in home or laboratory I would like to be powered from the mains. According to the scheme, “charging” from a cell phone is in principle suitable, it has a transformer, and the secondary circuit does not come into contact with the mains. The problem is only in the supply voltage - "charging" gives out 5V, and the multimeter needs 9V.
In fact, the problem with increasing the output voltage is solved very simply. It is only necessary to replace the VD4 zener diode. To get a voltage suitable for powering a multimeter, you need to put a zener diode on a standard voltage of 7.5V or 8.2V. In this case, the output voltage will be, in the first case, about 8.6V, and in the second about 9.3V, which, both, is quite suitable for a multimeter. A zener diode, for example, 1N4737 (this is 7.5V) or 1N4738 (this is 8.2V).
However, another low-power zener diode for this voltage is also possible.
Tests have shown that the multimeter performs well when powered by this power supply. In addition, an old pocket radio powered by Krona was also tried, it worked, only interference from the power supply slightly interfered. The voltage in 9V is not limited at all.
Rice. 3. Voltage adjustment unit for reworking a Chinese charger.
Do you want 12V? - Not a problem! We put the zener diode on 11V, for example, 1N4741. Only you need to replace the capacitor C4 with a higher voltage one, at least 16V. You can get even more stress. If you remove the zener diode at all, there will be a constant voltage of about 20V, but it will not be stabilized.
It is even possible to make a regulated power supply by replacing the zener diode with a regulated zener diode such as the TL431 (Figure 3). The output voltage can be adjusted, in this case, by a variable resistor R4.
Karavkin V. RK-2017-05.
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