Power supply unit for Asus ROG GU501G GM501G. How to convert a cell phone charger to a different voltage Telephone power supply

2 590 ₽

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Ring-shaped LED lamp + tripod. New. There is a guarantee and delivery in Moscow.

A very useful tool that will be useful to everyone!

For make-up artist or lashmaker (eyelash extension master), beauty salons: The lamp provides uniform illumination and full view. The light from the ring lamp enhances 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 selfies, stream, record videos in a video blog or instagram. The lamp provides high-quality, professional lighting and unusual reflections in the eyes

As an unusual element of the interior, 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 type of light you need for a specific photo or makeup color
2. By adjusting the brightness, you can select the desired power without moving the lamp
3. Possibility 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. Power supply unit
2. Tripod 2 meters
3. Phone holder
4. Bag case (for the lamp 35 cm.)
5. Remote control (for 32 cm lamp.)

Specifications:
Wattage: 48W, 180 to 480 LEDs. Diode service life 50,000 hours
Outside 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 from an outlet)
3) diameter 35 cm. + Tripod + bag-case, powered from the outlet (this lamp is not only larger in diameter, but also more powerful - it has two rings of LEDs)
4) diameter 50 cm. + Tripod + smartphone mount + bag - ideal for professional studios and anyone who needs the most powerful bright light

Bluetooth remote for an additional fee - 190r (controls the phone. You don't need to hold or reach for the phone with it)

Also, you can buy wholesale ring lamps from us.

Delivery in Moscow - TODAY, by courier to the address
- Pickup - showroom in the very center of the city, near metro Lubyanka
- Delivery to regions by Avito-Delivery
- Warranty for all goods

Greetings radio amateurs !!!
Going through old boards I came across a couple of switching power supplies from mobile phones and wanted to restore them and at the same time tell you about their most frequent breakdowns and elimination of shortcomings. The photo shows two universal schemes of such charges, which are most often found:

In my case, the board was similar to the first circuit, but without an 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 which most often fail:

And we will check all the necessary details using a conventional DT9208A multimeter.
It has everything you need for this. Continuity mode for diodes and transistor junctions, as well as an ohmmeter and capacitor capacitance meter up to 200μF. 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.

Modern mobile devices and all kinds of gadgets are equipped with many trendy and useful features and applications. And the most complex mobile games are striking in 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 choose an additional

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 determine the main reason, and only then look for the most optimal ways to solve the problem that has arisen. So what could be the reasons for the early discharge?

If the smartphone or tablet is new, the instructions state a certain operating time, 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 power consumption, or disable several applications that drain the charge.

It's another matter if the smartphone is configured, 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 analog.

Types of external batteries

Despite the prevalence of cell phones and smartphones, there are still only three main types of batteries in the world:

• Lithium ion... This is perhaps the most common external battery for charging a phone. It has a more optimal balance of durability, safety and energy intensity than other analogues. Also, such elements are endowed with a special "memory effect" and are rather slowly discharged. But they age quickly, 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 due to their low cost. In addition, the higher their energy intensity was, the higher the physical size.
• Lithium polymer... These are cheaper and more advanced external batteries for cell phones. Therefore, such elements have adopted all the positive aspects of the original sample, and also become more environmentally friendly.

Features of work and operation

The mobile phone is a rather 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 phone 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 item.
• Outside ones do not tolerate 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.

Mobile battery myths

For all the time of existence mobile phones practically overgrown with various fictions and legends that frighten naive users. Several of them concern their most important details.

Parameters to look for when choosing chargers

When choosing an additional external battery for your phone, there are many factors to consider (besides 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.

• 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 an ordinary phone, a device that produces 1 A.
• 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 essential in the daily use of smartphones and phones. There are several options for displaying the charge: by changing the color or numbers. A numerical indicator is much more accurate in informing about the state of the battery, but it also costs much more.
• Number of ports used... Savvy and prudent users choose the 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 enough.

Several features to look out for when choosing batteries

In addition to the main parameters that need to be paid 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 your phone, on which the power button will not stand out against the background of the case. After all, if you press it accidentally, you can get a rather unpleasant surprise. The presence of a special flashlight will also be useful in the device to make it easier to find in the dark.

In order to protect a valuable item from all kinds of dust or water, as well as to protect it from small shocks, it is necessary to choose devices with a special case. Such devices will cost a little more, but their service life will obviously be longer.

Fans of modern innovative technologies will appreciate the presence of features such 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.

It will come in handy for any battery and After all, in the summer we are not always near any power source.

To get a high-quality battery that will last long enough, you should take this issue seriously. Before making a final choice, you need to familiarize yourself with the most common options, compare characteristics and reviews. And only then it will be possible to buy for the phone.

1. First of all, this device should be convenient, lightweight and compact enough to fit freely in any bag.
2. A charger from the same company as the main device will do much better than similar counterparts. In addition, in this way you can protect yourself from low-quality goods.
3. It is better to clarify in advance whether a return of the purchase is possible, and under what conditions. The charger may simply not work corny.

Comparison of the most common external batteries

There are many external telephone batteries available. There are probably as many of them as there are mobile devices themselves. At the same time, everyone chooses their own external battery for the phone. Testimonials are the first thing that gets attention. 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 disadvantages is 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 "Proglot". Universal battery. It has a variety of dedicated connectors for all kinds of devices and can easily replace internal batteries. Minus - in the absence of adapters.

Universal external battery

As the worldwide omniscient statistics show, almost every city dweller has two or more mobile devices, as well as a laptop and several other gadgets. Therefore, many people strive to purchase a universal external battery for the phone, but so that it fits with other devices.

Such a choice allows you to kill several "birds with one stone" at once: the ability to simultaneously charge all available gadgets from one device, saving money and space. At the same time, the operating rules for such devices are the same as for narrowly targeted batteries. In addition, modern stores can offer a huge number of batteries of various prices, characteristics and quality. Therefore, it is the most optimal choice for any user.

You don't have to buy an additional power supply for your smartphone. If desired and certain abilities, you can easily make a homemade external battery for your phone.

The most common homemade products are battery and solar charging. 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 elements to the plug and transfers the charge to mobile device... The downside is that the batteries need to be constantly changed.

In the case of solar charging, you can simply buy special flashlights that charge from the sun and take the necessary elements from there. Next, a circuit is connected by means of a diode, and the structure is tucked into some kind of box.

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. Basically, a charger for cell phone it is not.

This is only a 5V pulsed constant current source, and the actual charger, that is, the circuit that monitors the battery charge and provides its charge, is located in the cell phone itself. But, the point is not in this, but in the fact that these "chargers" are now sold everywhere and are already so cheap that the issue of repairs somehow disappears by itself.

For example, in the store "charging" costs from 200 rubles, and on the well-known Aliexpress there are offers from 60 rubles (including delivery).

Schematic diagram

A typical Chinese charging circuit, copied from the board, is shown in Fig. 1. There may be an option with the rearrangement of the diodes VD1, VD3 and the Zener diode VD4 to the negative circuit - Fig.2.

And more "advanced" options may have rectifier bridges at the input and output. There may be differences in the denominations of parts. By the way, the numbering on the diagrams is arbitrary. But this does not change the essence of the matter.

Rice. 1. Typical Chinese network diagram charger for a cell phone.

Despite the simplicity, it is still not bad. pulse unit power supply, and even stabilized, 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 made on the basis of a high-voltage blocking generator, the pulse width of which is regulated by an optocoupler, the LED of which receives voltage from a secondary rectifier. The optocoupler lowers the bias voltage at the base of the VT1 switch transistor, which is set by the resistors R1 and R2.

The load of the transistor VT1 is the primary winding of the transformer T1. The secondary, step-down, is winding 2, from which the output voltage is removed. There is also winding 3, it also serves to create a positive feedback for generation, and as for a negative voltage source, which is made on the diode VD2 and the capacitor C3.

This negative voltage source is needed to reduce the voltage at the base of the VT1 transistor when the optocoupler U1 opens. The stabilization element that determines the output voltage is the VD4 Zener diode.

Its stabilization voltage is such that, together with the direct voltage of the IR LED of the optocoupler U1, it gives exactly the very necessary 5V that is required. As soon as the voltage on C4 exceeds 5V, the VD4 zener diode opens and current passes through it to the optocoupler LED.

And so, the operation of the device raises no questions. But what if I don't need 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 radio amateur circles, multimeters are powered by "Krona" - a compact 9V battery.

And in "field-field" conditions it is quite convenient, but at home or in the 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 is not in contact with the mains. The only problem is the supply voltage - "charging" gives 5V, and the multimeter needs 9V.

In fact, the problem of increasing the output voltage is very simple to solve. You just need to replace the VD4 Zener diode. To get a voltage suitable for powering the multimeter, you need to put a zener diode at 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, ЗV, which, both of which is quite suitable for a multimeter. Zener diode, for example, 1N4737 (that's 7.5V) or 1N4738 (that's 8.2V).

However, another low-power zener diode for this voltage is also possible.

Tests have shown Good work multimeter when powered from such a power source. In addition, an old pocket radio powered by Krona was also tried, - it worked, only the noise from the power supply interfered slightly. The voltage in 9V is not limited at all.

Rice. 3. Voltage adjustment unit for reworking the Chinese charger.

Want 12V? - Not a problem! We put a zener diode at 11V, for example, 1N4741. You just need to replace the capacitor C4 with a higher voltage one, at least by 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 regulated, in this case, by a variable resistor R4.

Karavkin V. RK-2017-05.

Any person at least once in his life has come across an untimely discharged battery of an urgently needed electronic device, and many of us have such a nuisance on a regular basis.

The way to solve the problem is simple - you just need 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 by feedback from experts and ordinary buyers. Just do not forget - in order to choose the best external battery, you need to really assess your needs and choose a device with the optimal capacity. As a first approximation, its value should be two times higher than the corresponding indicator of the battery of the gadget, which is supposed to be charged most often.

External battery capacity - what does it mean

By specifying the passport capacity for their external batteries, manufacturers write the truth, but not the whole thing. For example, the 13,000 mAh claimed for the Canyon CNE-CPB130, its built-in battery does. Only now it will be possible to fully charge a smartphone with a 4000 mAh battery with such a power bank only twice. The fact is that the nominal capacity here means the energy reserve accumulated by the device battery at its operating voltage. In this case, it is approximately equal to 3.7 volts, which is noticeably 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 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: currently external batteries use lithium-ion (3.6-3.7 V) or lithium-polymer (3.85 V) batteries, and the efficiency of the converters is in the range from 0.9 to 0.95.

Thus, knowing the "capacity" of the power bank and smartphone batteries, it is easy to calculate how many times you can charge the second device with the first device. 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 must be multiplied by the efficiency (set by 0.9). As a result, we get the useful capacity of the device, which can be used when charging.

Concluding our example, we have (13000 * 3.7 / 5) * 0.9 = 8658 mAh, which is enough for two full charges, say, Xiaomi Redmi 4X with its 4,100 mAh battery. And a little more will remain "in reserve".