How to Charge the Li-ion Battery

To one of the most common types of batteries include lithium ion. Data Battery methods differ from others, so always pay attention to what the charger is used.

You will need

- A mobile phone with a lithium-ion battery;

- USB Lithium battery charger.

Fully discharge the battery, if you just purchased a mobile phone. This is best done with the help of a call mode. For this call to any free room for you at the moment when the battery level is minimal (the last division of the indicator or sound signals). Wait until the battery level drops so that your phone is switched off. Turn on your phone, check the remaining battery level. If the unit turns off again, then it is completely discharged. If not, make a call again, as in the previous step. Make sure your phone is turned off. Connect it to the charger for a few hours. Wait until the battery is fully charged - this can be identified by the testimony of the indicator on your mobile phone. Upon reaching full charge or disconnect the phone at once, hold it connected to the charger for some time. Do not interrupt the charging process without extreme necessity.

Turn on the phone. This "training" is carried out several times - this will allow the battery to maintain operation for a long time, from two to six days. Use constant voltage method to charge batteries Li-ion. Its essence is to limit the voltage at the battery. The maximum voltage of 4.2 volts, the current recommended - 0.7 C. Reduce the charging current as the battery voltage closer to the maximum value. Make sure the charger is adapted for voltage 4.1 or 4.2, and the tolerance here is 0.05 volts per cell. Note that a small increase in its temperature (2 to 8 degrees) can occur when the battery is charging. BTW, you can select the battery charger at Banggood. Besides, you can easily get other electrical accessories (e.g. universal LCD controller) there with high quality and reasonable prices.

How to Make FM-Radio

In order to create your own or relayed FM-radio station, you need to go through several stages of obtaining permits. This station will allow you to broadcast with its own information and advertising inserts. The organization of the radio station is focusing on legal support of all procedures.

Register entity. This may be a company, JSC. To create a radio station, you need to obtain a license to broadcast, which is issued only to a legal entity. Register broadcasting company with the tax authority. To develop in the desired broadcasting frequency band (87.5 - 108.0 MHz). You will need to obtain the conclusion of the FSUE "GRCHTS" about the possibility of using radio and electromagnetic compatibility to prepare a bid and to sign the raw data. Depending on the availability of radio frequencies Radio Frequency Center will issue a report with an indication of the frequency at which you are allowed to broadcast. And also, you need to get the FM Radio kit.

Spend a registration radio as the media. At this point it must be made check the uniqueness of the name of a radio program. Following consideration of the documents you will be formalized certificate of registration as a radio media. Submit an application to grant a license, prepare a program concept of broadcasting, the cover letter. As a result of the application you will receive a license to conduct radio. Man, you have to apply for participation in the competition for the right to obtain a license to broadcast in the heart of the subject of federation or village with a population. BTW, you can select the FM Radio kits at Banggood. Besides, you can easily get other electrical DIY accessories (e.g. DIY mini amplifier) there with high quality and reasonable prices.

Apply for a license for communication services for broadcasting purposes. Prepare a set of application documents with the description of services and the scheme of construction of communication networks. Register the transmitter in the territorial department and get a certificate of registration of radio-electronic means.

How to Check the IR Receiver

With the advent of remote controls life has become much easier. And if you set the IR receiver on your computer, you can remotely control them as well. This is easy to do yourself. Connect the IR receiver to the computer using the supplied cables. The operating system detects the presence of the new device. Set the receiver driver and run the program. Choose to set up the program in IR receiver tab, type your scheme, then it will be detected by the computer and running.

To test the Arduino IR kit, use a remote control, for example, TV or music center. Get it in the program, select the location and code reading of each button. Test the remote control to the computer. In fact one can use any IR. You can also use one remote to control multiple devices. Only it is necessary that they were not near a computer, or they will receive signals and commands from the remote control at the same time.

When adding a new control panel, specify its name. Then use the mouse to select each button turns on its circuit. To do this, press the corresponding button of the real console upon request. Bind commands to the remote control. To do this, go to the tab "Actions" and call the configuration wizard, which will provide you with a list of programs, with which you can control with the remote. Then go directly to the definition of the necessary commands for the buttons. BTW, you can select the IR wireless receiver at Banggood. Besides, you can easily get other electrical accessories (e.g. 220V timer relay) there with high quality and reasonable prices.

There are already proceed at their own discretion and, depending on your needs. One button can perform several commands, depending on whether the program is running, so it is a creative process. Thus, you can configure the remote control absolutely any of your computer programs with a single remote. Depending on the IR receiver models will vary the number of its features and functions, but by and large everything looks the same.

USB Soldering Iron for Household

In my household there is a simple soldering and rework station, which fully covers all my needs in any soldering elements. Rather it seemed to me that this is so. But once in my car failed the stove works, as I found out later - the reason for this was warmed up contact and, as a consequence, fusion connector. Having read various forums, I learned that it's a pretty common problem for my car brands and decided it circumcision contact and soldering wires directly to the heater control board.

Available USB soldering iron in their original packaging is a plastic box in the likeness of the blister. In the scope of delivery, in addition to the soldering iron, you can find a small piece of solder, a little, but at the same time convenient, stand, as well as the cable for connecting the handpiece to the network. On one side of the cable standard USB connector, and the second is something very similar to a standard 3.5 mm jack.

This USB soldering iron is a very high quality - housing halves perfectly adjusted to each other and tightly coupled, making it a pleasure to take in hand, no squeaks, when compressed does not rattle, no foreign smell. But very plastic, used for the manufacture of body could be better, not that it was bad, but it just slippery, soldering all the time trying to slip out of your hands, it stops light green ring located on the leading edge of the housing. Using a soldering iron is very convenient, and it fits the hand like a pen. BTW, you can select the soldering iron at Banggood. Besides, you can easily get other electrical accessories (e.g. USB tower fan, 2MP USB digital microscope endoscope magnifier 40x 800x) there with high quality and reasonable prices.

How to Make a Tachometer

If your standard instrument panel design does not provide for the tachometer, it is easy to correct this deficiency. To build a strong and beautiful body for the LED tachometer, you'll need a little perseverance, some simple tools and simple materials at hand.

You will need

- Tachometer suitable model

- Can a suitable diameter

- Metal scissors

- Epoxy adhesive

- Foam

- Fiberglass

- Paint

- Sandpaper

- Office or any other sharp knife

- Awl or chisel

- Putty

- Sided adhesive tape car

- Household hair dryer

- A small rubber spatula

Make a blank body. To do this, you will need to insert a tachometer in the appropriate size tin, then smooth and neat scissors to cut metal sheet surplus. Try to obtain a clean cut, free of nicks and burrs, otherwise then you will either have to spend a lot of time and effort on the grinding edge details or to make a new piece. BTW, you can select the tachometer at Banggood. Besides, you can easily get other electrical accessories (e.g. fluorescent clock) there with high quality and reasonable prices.

Fill the bottom of the cans with foam. This will adjust the "fit" of your tachometer in the case and further strengthen the part. In addition, apply a layer of foam on the external part of the body to the place where the tachometer will presumably be fixed to the dashboard. Shape the future housing. Once you have given the mounting foam to dry (best to let this process for twenty-four hours), cut off the excess foam with a knife. Inside, you should have enough space to fit a tachometer. Outside, the foam should be cut off, forming a "leg", which we will later be glued to the dashboard. Do not forget to make a hole for the wire tachometer.  The most difficult thing is behind. We proceed to the finishing. Use sandpaper to smooth out irregularities and roughness on the surface of the foam, as well as remove a layer of gloss paint from a can.

Attach the housing blank. To glue is completely dry, the workpiece should be kept in a well-ventilated room for twenty-four hours. Cover the part with one or two layers of paint in the color of your dashboard. If necessary, after the complete drying (see the instructions in the manufacturer of paint) cover the item with one or two layers of lacquer. Install the tachometer. Place the tachometer in the finished housing, output wires through the hole that you left for them, and connect. 

Xiaomi VR 3D Glasses Review

In the new products release conference of the Xiaomi Company shortly before, in addition to the release of the first double-curved screen mobile phone, Xiaomi also released the official version of the 3D VR glasses. AFAIK, this pair of fresh VR glasses adopts the hardware-level motion sensor, not only increasing 16 times of sensitivity but also achieving a 16ms delay. In addition, the new Xiaomi VR 3D Glasses come with a 9-axis body feeling handle, which is the biggest difference with the Gear VR and provides a wonderful user experience.

Appearance and Design

The official version of the Xiaomi VR 3D Glasses uses the white main color, plus with the integrated headband design, making the overall appearance modern and concise. The inner part of the eyeglasses, which contacting with skin, adopts the soft island velvet fabric, skin-friendly and comfortable. With the dimensions of 7.87 x 11.61 x 6.14 inches, the whole device weighs just 209 grams, very light to wear.

Equipped with a distance sensor, it can detect whether the user wear the device and immediately start. Joined by the object distance adjustment knob, it supports up to 600-degree myopia and 200-degree hyperopia. In addition, the official version of Xiaomi VR 3D Glasses also supports head circumference adjustment. And the integrated headwear design is conducive to dispersing pressure.

Specs and Performance

The official version of the Xiaomi VR 3D headset uses the self-developed MIUI VR platform of Xiaomi Company. There are already more than 500 panoramic videos, 30 VR applications, and over 200 VR developers having submitted the development permits. This novelty is compatible with any smartphone which is sized of 4.7 – 5.7 inches. Coming with a 9-axis motion sensing remote controller (powered by 2 AAA batteries), it is more convenient to use. Also, it provides the 103-degree super wide-angle FOV.

Specs:

• Compatible with: Smartphones
• Smartphone Compatibility: 5.0 - 5.7 inch
• Interface: No
• Bluetooth version: Bluetooth V4.0
• FOV Range: 90 - 110 degree
• FOV: 103 degree
• IPD Adjustment: No
• IPD (Interpupillary distance): No
• Focus Adjustment: Yes
• Space for Glasses: No
• Primary Button Type: Remote Control
• Games support: No
• Product weight: 0.408 kg
• Product size (L x W x H): 20.00 x 29.50 x 15.60 cm / 7.87 x 11.61 x 6.14 inches

Summary

As far as concerned, the original Xiaomi VR 3D Glasses are good news for people with myopia or hyperopia. In addition, it would be a right choice for the novice of VR Glasses, starting a simple VR experience.

How to Change the Mixer

As you know, nothing lasts forever. That mixer in the kitchen or bathroom can wear so much that it will not help. This mixer will have to change. If you looked carefully at the store shiny new faucet will again have to change the old faucet on a new one. How to do it, read on.

You will need

• Adjustable multitool wrench;
• Pliers;
• Flashlight;
• Sealant;
• basin;
• Hoses;
• Special plumbing tape.

First you need to get rid of worn out (obsolete) mixer, pre-blocking water. Open the valve on the mixer, the system to get rid of the pressure, and the remaining water from the tap is fully emerged. If you want to change only the mixer, you will be disconnected enough from it hoses. If you want to change more and hoses, disconnect them from the pipe fittings.

Usually mixers reinforce two standard ways: on a narrow or a broad-based. To remove the faucet, mounted on a narrow basis, just climb up under the sink. If under it loose enough that you can easily unscrew the nut with pliers. With the mixer on a broad basis will have to sweat a little. First, you must unleash the faucet handles. To access the nuts holding a mixer, you need to get rid of handles and even from the pads under them. You can unscrew the nuts now.

After loosening the screws pull out of the sink faucet by the wrench jaw. Noticing the gasket located between the base of the mixer and sink, remove it with a knife. Together with the seal, and dispose of the old seals with a touch of lime, gathered around the old faucet. Print limescale and other dirt can be diluted in water with vinegar or special household products.

Now you can install a new faucet. If he has a wide base, the installation is relatively easy. But if the base is narrow, you will have to climb under the sink. It is necessary to tighten the nut and at the same time to control the tilt of the mixer and its location. And for this we need an assistant. Before using the new mixer, check the possible leak, then remove sealant residue from the base of the mixer.