Multi-Purpose Portable Speakers with FM Radio and Recording

One of the main criteria for selecting the speaker at an amateur level is still the size. Massive columns certainly fill a large room sound, maintaining the frequency-amplitude transitions across the spectrum. However, such equipment cannot carry around. It is not the first year, but in recent years, the concept of mobile analogue music systems has gained unprecedented popularity. Today, I’d like to introduce you two multi-purpose models.

Rolton E500 Mini Portable Stereo Bass Dual Track Charging Bluetooth Speakers FM Radio with Recording

Features:

1. 5 in 1 functions: Bluetooth speaker, FM radio, Recording, Music player, Flashlight. It’s a small item with big functions.
2. Built-in Rechargeable Battery for up to 8 hours of playtime when fully charged. Built-in microphone is for hands-free speaker phone calling.
3. This Mini Portable FM Radio supports iPhone, iPod, Samsung and most smartphones as wireless speakers, compatible with all Bluetooth-enabled devices or media devices with 3.5mm AUX port.
4. LED display, see clearly even in dark room.
5. Premium sound with bass enhancing technology supports to be used as a speaker for your phone and computer.
6. It's easy to carry, very light and thin, same size with iPhone 6.
7. Just need one E500, have a fun with your friends and family anytime and anywhere.

BENJIE K9 Mini MP3 Player with Speaker 60hrs Lossless Voice Recorder FM Radio Support 64GB TF Card

Features:

1. Lossless audio: With excellent sound quality, it supports MP3, WMA, WAV, FLAC, APE and AAC. You can add bookmark for your music files (including audio book it supports). Built-in speaker, allows you to enjoy music without earphones.
2. Inner storage 8GB, can be as a 8gb USB Flash drive, and driving program is not necessary, can store about 2000 songs, TF/Micro SD Max extended to 64GB.
3. Easy 'Drag & Drop' Audio Music File Management: Delivers professional recording results, Built-in 360-degree way Record Marks, PCM linear recording, restore the most authentic recordings.
4. Easy to use: Use playlists to select your favorite songs. Supports shuffle and breakpoint play. Has sleep shutdown.
5. Long battery: Can last up to 50 hours after full charge, so you can enjoy music a long time without worrying about the mp3 running out of power.

BTW, you can easily get these Multi-Purpose Portable Speakers at Banggood for high quality and reasonable prices.

What Is Arduino and What You Can Do with It

Now people in the world, keen appliances, there is a real "arduinomaniya". That little mysterious device dedicated to thousands of articles, hundreds of blogs and forums. So what is it - Arduino? And why he gained so much popularity?

The Arduino is a small electronic device that consists of a single printed circuit board, which is able to manage different sensors, motors, lighting, send and receive data ... Arduino - it is a whole family of devices of various sizes and capacities. And it's a whole zoo clones Arduino and Arduino world-compatible devices. But let's take first things first.

"Brain" Arduino - this microcontroller is form Atmega. The microcontroller is a microprocessor with memory and various peripherals implemented on a single chip. In fact, this one-chip microcomputer that can perform relatively simple tasks. Different models come with different family Arduino microcontrollers. Such microcontrollers are on the Arduino UNO and the Arduino Nano V3 Pins (but in the other case).

Hands in this case serve as electrical terminals, placed on the perimeter of the Arduino board. There are lots of boards with pins, there are smaller. For example, the largest salary in Arduino family - the Arduino the Mega - has more than 70 independent conclusions, and the smallest - the Arduino the Pro the Mini is a total of 22 output.

Not all the conclusions have the same Arduino. There are findings of digital, and there are analog. The principal difference between them is that the digital output may be only two values: a logic "1" (TRUE, from 3 to 5 volts) or logic "0" (FALSE, from 0 to 1.5 volts), and at the analog output - ranging from logic 1 to 0 is divided into many small sections. BTW, you can select the Arduino cable at Banggood for high quality and reasonable prices.

Main Types of Monitors: TFT LCD Module

Monitor as a means of visual display there for a long time and its history has undergone several revolutionary changes. If more than a few years ago, manufacturers have mainly struggled for opportunities to ensure high performance base "pictures", today becomes tougher competition between different concepts of realization of the device. Modern types of monitors are distinguished by a set of criteria that lead to not only the image quality, but also the presence of interfaces of communication, energy-saving performance, functionality, and other performance.

At first glance, modern monitors for computers are no different from TV. At least, if we compare the small models of similar size, the difference cannot be overlooked. And yet it is. Thus, if the TV classic - a stand-alone device that receives and plays audio and video from cable and satellite stations, the monitor is a hardware means of processing and graphical information, the source of which is a special card. With regard to the external differences, they most clearly express the monitor type (e.g. TFT LCD display) on a laptop, which can be represented by a matrix of the family of liquid crystal displays. In particular, today the common formats TN matrixes, the MVA and the most modern development - IPS. Compared with the same TV sets, these modules provide higher quality and detail reflection of graphical information per unit area of ​​the screen.

The basic module, which is balanced in performance and so wide spread is TN. This system ensures good response time, an average of 20ms and a low cost of manufacture. But due to the modest performance of color and low contrast such matrices are not in demand among discerning connoisseurs of high-quality images. The best replacement for such devices are modules and IPS TFT - monitor type that has decent contrast, does not stand out with broken pixels and transmits the optimum color reproduction at high viewing angles. However, Arduino TFT LCD module in modern versions is more expensive and requires higher energy consumption.

How to Select Cable

In everyday life we use many electrical appliances that require a variety of wire and cable in the choice and placement of which requires special knowledge and rules. Choosing the cable or wire should be guided by the basic criterion - purchase goods only from manufacturers of famous brands and proven in the field of reliability and quality.

The residential area is mainly used PVA brand wire and cable brands such as VVG, NYM and VVGng. PVA is a stranded wire, with a circular cross-section copper wire. It is used to connect power tools and household appliances, gardening. Wire laying at a temperature between -15o C to + 40o C Wire insulated material of PVC plastic. Core - copper, flexible 20 AWG cable.

VVG applies to power cables. Its use in stationary installations is for the distribution of electric power with voltage of 0.66 to 1 kV, in a temperature range from -50 to +50 degrees and humidity of 98%. VVG cables used for installation in residential and industrial premises, in dry and wet. VVGng cord is different from the VVG that its shell is made of heat-resistant materials, so it is used at facilities with special requirements for electrical and fire safety.

Cable core VVG and VVGng made of soft copper wire of circular cross section. By increasing the cross-section of more than 16 square millimeters, it is performed live as much of the wire harness. And finally, it is the brand NYM cable. Thanks to an extra layer of chalk-rubber insulation from the cable, increasing its resistance to cracking during installation in extreme conditions. External insulation is made of a flexible plastic, which leads to increased safety. Thanks to these qualities, the popularity of this cable is continuously growing. BTW, you can select the 20 cable at Banggood. Besides, you can easily get other electrical accessories (e.g. translucent bag) there with high quality and reasonable prices.

Cable cross-section area is considered electrically conductive wires. According to the formula π (= 3.14) xr2 calculated cross section of a circular core. The cable typically has several conductors, so the total cross section of tiles equals the sum of the cross sections of each core. Cable cross-section selected with future load. Note, however, that the cross section of aluminum wire should be chosen much higher, because its conductivity is 40% lower than that of copper wire.

How to Connect the TV Monitor Properly

There are situations when the usual things are not used for its intended purpose. For example, you have spoiled TV (problems with sound or image) and watch your favorite TV shows you want. In this case, the aid comes to you primordially Russian ingenuity: to use a computer monitor as a TV translator.

You will need a set of wires (depending on your TV and monitor) and 5 HDMI monitor. And you need to properly understand and analyze what wires required for the operation. The biggest difficulty is that the model of your TV may refuse to accept the computer monitor to the desired compound.

First you have to identify, we already have to connect the wires in. It should be called the basic connection of the system:

- a VGA (most often blue cable)

- the DVI (white cable)

- a common connection (cable color yellow),

- a SCART.

Now consider what your TV has inputs. Available inputs may be three options: a free HDMI, VGA - a complex component or port. In each case, your further work will be different. If your TV has an HDMI input, and the computer - DVI input, you can organize them and use a DVI to HDMI cable.

If both devices have a VGA - connection, the extra issues does not arise, since it is the perfect option. If the computer has available a VGA - connection, while TV has only HDMI - connection, it is possible to connect a VGA - DVI cable to the converter, and then attach a DVI to HDMI cable - connection. This method can support HD signal.

Also note that the cables for VGA, component video, and DVI cannot support the TV's audio signals. A separate audio cable can connect the sound card to a TV, HDTV if the audio input is present. TV sound can be output to computer speakers or a home stereo system. If your computer can not support video, you need to install a new video card that will work in the desired mode. BTW, you can select the TV Monitor at Banggood. Besides, you can easily get other electrical accessories (e.g. female pump) there with high quality and reasonable prices.

How to Learn to Decorate the Balls

Decoration balls of interesting hobby for a long time developed into a growing business industry. This holiday design - fun is not cheap, so do not be amiss to learn to make their own beauty from the air. Perhaps starting with the decorations of the holidays, you will gradually get to create your own Aerodesign studio.

Find online video tutorials Aerodesign training. Most of them are placed in the public domain and are free. In addition, there are many paid online courses drawn up by professionals. These lessons include useful tips and secrets Aerodesign. Decoration balls can turn from a hobby into a profitable business. For this purpose, various seminars are held periodically. Sign up for one of them, it will help you understand the intricacies of Aerodesign and properly dispose of the acquired knowledge. Decoration balls turned into a kind of science, sells special equipment for it, but to decorate a room for a holiday you will be able to obtain a simple figure. BTW, you can select the ballons at Banggood. Besides, you can easily get other electrical accessories (e.g. head sucker) there with high quality and reasonable prices.

                                             

Start with a simple decoration pieces, such as a flower. Take 5 balls of the same size. One of them has a different color from the others. Prepare the template: Take a piece of cardboard and cut it in such an oval, so that it will fit the size of the ball, which you need the petals. Filling the balloon with air, insert it into the template hole and inflate until the tab is not at the desired volume. So did the other three balloons and tie the resulting petals together, forming a flower. Last ball inflate slightly smaller and attach it to the base figure. Flower will be more decorative, if you tie a pitch one more row of balls, large size and different color.

Decorate the room with garlands and a DIY balloon column. Take the 40 beads with a diameter of 5 cm. Inflate all the balloons and tie them. Connect the 4 elements, as you have done by making a flower. Make 10 of these 'fours'. Firmly connect the parts garlands fishing line, tieing her attachment balls. On both ends of the tie garlands 2 balls, larger sizes and decorate the junction packaging bows. The same principle is made columns and pyramids, only for the stability you need to use a strong skeleton of wire, fishing line instead.

How to Connect a Line Laser Diode

To connect the diode, you must make sure that its settings correspond to the electrical circuit. Also, before you connect the diode should be checked for serviceability, the device is not out of order. You will need Equipment needed: soldering iron, a screwdriver, a wire, a knife, a multimeter and a line laser module.

Checking the diode as well. To do this, set the multimeter to continuity test mode circuit or resistance measurement. Conclusions diode and should not be connected to any equipment. Touch probes conclusions diode and then change the location of the probe and repeat the operation. Defective diode should call only in one direction. Remember or somehow mark the conclusion to which the touch probe is positive polarity, when the diode is ringing. This conclusion is called the anode.

Mounting diode and the AC circuit. Perform a gap in the chain of alternating current, by cutting a wire or disconnect it from the terminal of a power tool. Strip the ends of the wires using a soldering iron. Solder terminals diode and to the resulting ends, or, if the structure diode and, via wires connect bolting.

Installation of the red diode and the DC circuit. Follow the break in the circuit, and strip the ends of the wires obtained. Determine the polarity of the voltage in the circuit, which will be installed diode. This can be done by using a multimeter in the DC measurement mode. Touch probes to the ends of the wires in the generated circuit. If the reading on the display will be negative, the negative or common probe located on the wire with positive polarity. If the reading is positive, the positive probe touches the point with the appropriate polarity. Determine polarities the diode and the electrical circuit. If the diode is used as a conductive member, connect the anode to the point with a positive voltage. When using a diode and an anode of the locking element joins the minus electric circuit. Solder or otherwise attach the conclusions diode and to a portion of the circuit.

How to Choose a Rangefinder

Recently, laser rangefinders are increasingly replacing conventional tape measure when measuring distances. They do not require the services of assistants, save time, provide highly accurate readings. Ample opportunities to select more difficult acquisition of the correct model, but knowing some of the nuances and features, you buy what you need and do not overpay at the same time.

The basis for the choice of the ratio of the parameters put functionality / cost of the device. The odds in this ratio are in the direction of one or another parameter defines the scope of the EDM - professional or consumer. The functionality of each model is determined by the size of the measured distances, reliability, accuracy and service. In order to more accurately select the appropriate model, determine the range of tasks for which it is acquired.

First of all, pay attention to the range determined by the distance. The best model is carried out measurements at distances up to 200 m, but if the device is needed for domestic use, and enough range of 30-50 m In addition, the measurement of distances over 50 meters require the use of additional equipment -.. A tripod and reflective lenses, with which to work adapted not all models.

Then, determine the required degree of accuracy. Generally, the most accurate measurement models have tolerances of 1 mm. However, in most cases, the accuracy of 5 mm is quite sufficient. And the accuracy of the range finders provides most - their accuracy is 1.5-2 mm.

Deal with additional functions. Among them are often found the calculation of areas and volumes, measurement memory, addition and subtraction. With the help of additional equipment can be carried out, or optical digital sight, the level of exposure, the transfer of data via Bluetooth, measurement biases. The presence of these features increases the cost of construction, but not always finds its application in business. BTW, you can select the 100M Laser Distance Meter at Banggood. Besides, you can easily get other electrical accessories (e.g. 220V Pyrography Tool Kit) there with high quality and reasonable prices.

GOLE1 Mini PC Banggood Sale

Mini PC is a thing compact and convenient. It can become a real alternative to the netbook and the old one system unit. But sometimes even a box of 12x12 cm is too cumbersome and unwieldy. Let's say you want to wear your work computer with you in your pocket. Do you think this is unrealistic? Certainly it is not.

What is the current mini-PC? This small device in a plastic housing with dimensions of about 85x15x25 mm and weighing 20-30 g The computer is connected to any digital TV or monitor (where have all the USB flash drive is plug-have mini-PC - HDMI), through the computer and receiving power.

Typical mini-computer processor (e.g. GOLE1 Computer) is built on ARM Cortex (A5 to A15), equipped with 1-2 GB of RAM and has a built-in flash drive 4-8 GB. Actually, all as at intermediate or advanced smartphone, only there is no screen and the mobile unit. But the card reader (for micro-SD cards) and Wi-Fi module and Bluetooth are present almost always. Most often, there is also a USB-in, so it can be connected to a computer mouse with the keyboard: if you want via USB and you want - and Bluetooth.

The analogy with the phones used by enhanced operating systems: most mini-PCs pre-installed Android and Windows. You can do more cunning: add to his "old man" of the mind. In fact, the modern "smart TV" is different from the old and stupid network access, and rich multimedia capabilities. And that and another can give him with the help of a mini-PC. By putting on a mini-computer some advanced media player (such as the famous MX Player), we will make it virtually "omnivorous": computing power ARM Cortex-A9 processor and older enough to play virtually any video in resolutions up to Full HD. Oh and web applications on Google Play, only small car and truck.

BTW, you can select the GOLE1 Computer at Banggood. Besides, you can easily get other electrical accessories (e.g. voltmeter display) there with high quality and reasonable prices.

How to Choose a Game Console

To select a game console should be guided primarily its purpose - whether you use it only for games, if you feature video viewing and playback of audio CDs are needed, and so on. Currently leading position in the console market is occupied by Sony device, Microsoft, and Wii.

Determine which games you purchase a video game console. It is worth to take into account the parameters of performance, especially in the graphics - many of the devices are oriented to simple games, and some have focused on the design. Also, you should consider options for the use of their advanced features. Some versions of consoles are available not only for games but also for watching movies.

If you essential performance, functionality and design, pay attention to the Sony PlayStation console. This console can be used not only for games but also for playing audio and video discs. Despite the obvious advantages, this option has two significant drawbacks - small base game at the moment and cannot play back discs with the personal contents.

If you prefer a simple game, without requiring a lot of graphics, you can consider the Nintendo Wii version. This console is perfect for the usual childhood games and simple simulations. In addition, it is characterized by excellent compatibility with games for older versions. Also, this console has advantages price category. A significant drawback here - it is impossible to use it for watching movies and listening to the audio, as well as the low level of graphics.

If you need something in between the first and second embodiment, prefer Microsoft console the Xbox. Significant plus Xbox - support a huge number of video games. Graphics performance parameters exceed the Nintendo, however, a significant disadvantage is the low reliability of the device. Despite this, it still is ideal ratio parameters such as quality, price and performance. BTW, you can select the Portable Game Consoles and their accessories (e.g. Nintendo N64 screwdriver or Nintendo security bit) at Banggood for high quality and reasonable prices.

Sprays Injector, the Appointment of a Device

Sprays nozzle - a mechanical device designed to spray a fuel injector and diesel engines. Gasoline or diesel fuel supply is then carried out under high pressure. Remarkably, for gasoline engines it produces atomization pressure of 3-5 atmospheres, while on diesel injection is carried out at 1000-1200 atm.

What is it for? This item performs several functions in the fuel supply system. Firstly, it dispenses the right amount of fuel injected. Second, the sprayer nozzle (KAMAZ-5460 as well) perform control function and cooking fuel jet. And thirdly, the device separates itself from the injection system of the engine combustion chamber.

Often, modern diesel injector water atomizer nozzle consists of one or two channels (nozzles), through which fuel is supplied to the output and subsequently sprayed into the combustion chamber. The qualitative part should ensure the smooth conical spray of liquid. Species At the moment, there are only two types of mechanisms: Pin device and Multi-jet. In the first case, the nozzles used in nebulizers Pin mechanisms vortex and diesel engines. Multi devices are supplied with most cars having direct fuel injection, including machines with "Common Ryle" systems. Both mechanisms have their own design features however, their working principle and main function remains the same.

When the nozzle sprays are in the open position, fluid is injected into the combustion chamber. From its quantity and quality of feed it depends on so many factors, ranging from the engine power and fuel consumption of finishing. If spraying is going wrong, the car starts to smoke, lose momentum and thus consume more fuel. There is a constant rope wheel nozzle, which can lead to complete failure of its failure. Sealing device in a closed state provides a tight fit of the needle tip into the saddle gun body. When the injector nozzles are in the closed position, this special needle is held by a spring which acts on the closure cone of the device. Also worth noting is that the injection "Common Ryle" instead of the spring applied pressure very flammable liquid.

How to Embroider Cable

Cables to connect computers to routers and switches often have to make by ourselves. Soldering is not applied. Embroider cable conductors installed in the connector, after which they are swaged.

You will need

- Cable or UTP KSSPV desired length;

- Clippers;

- Two RJ-45 connector types;

- Spiral wire wrap;

- A special tool to crimp connectors.

Get the special tool to crimp the RJ-45 type connectors. When buying, make sure that it is designed specifically for these connectors. Without him to carry out this operation, you cannot. Conventional pliers and other means at hand to implement it will not work. BTW, you can select the tools at Banggood. Besides, you can easily get other electrical accessories (e.g. Samsung ST65 USB cable) there with high quality and reasonable prices.

Pick up the end of the cable. Carefully remove the skin from it. With the wire insulation itself does not remove as special miniature knives, which, when broken down in to carry out this operation automatically located inside the connector. Turn the connector lever for pulling down gold-plated contacts on my own. The first output is on the left。 If you need a cable to connect your computer to a network switch, hub or router, the connectors on both ends of the cord is embroidered in the same way:

1 - Orange and white;

2 - Orange;

3 - Green and white;

4 - Blue;

5 - Blue and white;

6 - Green;

7 - Brown and white;

8 - Brown.

If you need to connect with each other or two computers or two any network device (router, switch, hub), collect the "crossover" type cable. To make it, one of the plug connectors is in the same manner as in the previous case. The second connector, connect as follows:

1 - Green-white;

2 - Green;

3 - Orange and white;

4 - Blue;

5 - Blue and white;

6 - Orange;

7 - Brown and white;

8 - Brown.

Insert the connector into the crimp tool. The ribbed side of the connector next to the gold contacts at the same time must deal with the surface of the working part of the tool, which has the same shape. Gently squeeze the tool until it clicks. Do not apply to him with excessive force. Then take ohmmeter (or any multi-function measuring instrument, working in an ohmmeter mode) and to each of its probes connect on pin. Rang the cable, and then start using it.

LED Night Vision Infrared Illuminator Banggood Sale

Infrared (IR) illuminators can be recommended for use in places where the camcorder is not enough ambient light for proper operation. Their use is due to two factors:

• the length of the spectral sensitivity of video cameras in the infrared region (this sensitivity is especially emphasized in some cameras)
• the invisibility of light for an outside observer (however, please note that the actual invisible to the human eye are the IR source with a wavelength of not less than 930 nm)
• the possibility of invisible illumination where the normal lighting can cause the displeasure of others because of their brightness and because of that it can influence the perception of historical monuments and buildings.

Infrared illuminator is characterized by:

• illuminated angle sector,
• radius of action,
• the wavelength of the emitted light,
• current (power) consumption.

Structurally infrared illuminators may be made in two ways:

• based on halogen lamps (IR-lamps) with IR cut filter (high range - can be more than 100 m, a significant power consumption 20 ... 300 W, wavelength 730 ... 850 nm, a relatively small lifetime of halogen lamps)
• solid state illuminators (IR-LEDs) using light emitting diodes, infrared range (radius of action, usually does not exceed few tens of meters, they are more economical, have smaller dimensions and weight).

In general it can be said that the IR-illuminators on a basis of the halogen lamps usually used in outdoor environments to illuminate the remote object, while the IR diodes increasingly used in areas, stairways, they are mounted in the outer panel video devices in the body of cameras and lenses.

At the same radiated power IR illuminators may have different angles illuminated sector (the sector has, the greater the range). It should be borne in mind that the higher wavelength, the smaller the range of infrared illuminator. BTW, you can select the infrared illuminator at Banggood. Besides, you can easily get other electrical accessories (e.g. DIY metal detector kit) there with high quality and reasonable prices.

Miniature Generator for DIY

This generator allows you to obtain a logic signal with discrete variable frequency from 0.5 Hz to 300 kHz and with the amplitude of 5V. Schematic diagram of the generator (Fig. 1) is very simple, it uses a minimum of passive components and only two integrated circuits. Power supply 9V will yield with integral stabilizer DA1, connected to a miniature 9 V battery.

The heart of the miniature generator is a Schmidt trigger DD1.1, which, together with R1 and C1 form a flip-flop, built on the classical scheme. The difference frequencies produced by multivibrator is determined by the appropriate number of connecting all capacitors, resistors and switches. The signals at points V1 - V5 can be changed by using a different set of breaks or connections in the circuit lines with SAl switches - SA5. The two tables in Figure 2 and Figure 3 clearly reflect the dependence of the frequency on the output device of the position of these switches.

The generator requires little or no adjustment. It is only necessary to choose carefully the capacitors C2, C3, C5. It is better if tantalum capacitors are installed in their place. DA1 78L050 chips can be replaced or stabilizer KP142EH5A KR142EN5V voltage. As set inverting logic gates with Schmitt threshold applicable K555TL2 chip. BTW, you can select the miniature alternator at Banggood. Besides, you can easily get other electrical accessories (e.g. eyeglass magnifier) there with high quality and reasonable prices.

PIR Motion Detectors Banggood Sale

The easiest way to see the motion detector in action when approaching the neighbor's porch light suddenly switched on. These intelligent systems are used in many homes, schools and shops for automatic lighting control, or as a burglar alarm. Most motion detectors are used a technique that is called passive infrared detection and typically uses a voltage of 220 V. As a rule, such systems are mounted on the wall or on the ceiling, where they cover almost the entire volume of the protected space. If the device uses power from the battery, it should be compact motion detector powered by 5V. Such sensors can be purchased from firms engaged in sale and installation of security systems.

The internal structure of a passive infrared motion sensor is a very simple device. The detector comprises two crystal lens and a small electronic circuit. When the infrared light (which emits any heated body, including man) falls on the crystal that generates an electrical charge, as anyone moving into the field of view of the sensor also emits heat waves, the motion sensor is easy to register his presence. BTW, you can select the motion detector at Banggood. Besides, you can easily get other electrical accessories (e.g. wireless pinhole camera) there with high quality and reasonable prices.

Typical motion sensor has three pins on the earth, a positive power supply and the actual sensor output. When the 5-volt power detector and provided that the field of view of the sensor are no people or objects heated, its output voltage will be close to 0 V. If a fixed movement, the output voltage jumps to the power level (5 V). Do not buy a passive infrared sensor separately from the sensor. Sensor itself is not equipped with a lens that is present in full the sensor, but because of it the sensor is able to capture the movement and not simply the presence within a radius of some body.

If you are interested in monitoring systems and would like to learn more about them, we will briefly look at other types of sensors.

1. Active infrared motion sensors. They use a light emitting LED and an infrared light detector (e.g. the 360 degree motion sensor). As the latter is used, for example, a phototransistor; it generates a current when infrared light falls on it. If someone crosses the space between the LED and photodetector, the transistor ceases to generate a current because the light path obstacle arises. Such sensors are only a kind of electric eye, which is great fans remember James Bond movies, especially those over 40. The effectiveness of such sensors can be used only in spaces with constant movement, for example, in the premises.
2. Ultrasonic sensors movement. These detectors generate ultrasonic vibrations that affect the objects of the room. If little or no room to move, the ultrasonic wave returns to the sensor unchanged. However, once someone or something to make a motion, the wave pattern will be distorted, and this change will enable the alarm. Such sensors can hardly be used in place of conventional passive infrared detectors, unless the ultrasound electronics not included in the area of your interest.

How to Connect the Laser Diode

The laser diode is different from the light diode and a very small die area. This leads to a significant concentration of power, so even a short-term excess current through the junction diode and can lead to burning of the crystal is not warm and the inherent radiation.

The most convenient for carrying out of experiments 250mw red laser, available in every computer disc burner for DVD-ROM drive. Take a drive with worn mechanics, more unsuitable for the intended use. Make sure the device is de-energized and with nothing connected, disassemble it and remove it from the moving carriage, two laser diodes as well.

Both diode and check in action. To do this, pointing the lens unit on a sheet of paper, connect the battery from the motherboard. The laser has three pins, two of which are connected to each other - they were freezing, the remaining terminal is the positive. Choose one of the two LEDs that illuminate leaf bright and saturated red. The second device is the infrared. The weak red light in his - side, the intensity of the infrared is much higher, so it is also impossible to guide the eye.

The laser, which turned red, set on a homemade radiator. For this purpose, the aluminum plate of about 4 mm diameter drill hole such that the device hardly entered therein. Between the body diode and the heat sink and apply a thin layer of thermal paste. Having turned away from the laser itself, plug the charger into the network. You will see the light. Try using a plano-convex or biconvex lens to focus it on a sheet of fusible material which absorbs red color. It will last a few seconds to a point and trace remains in its place hit. BTW, you can select the red laser at Banggood. Besides, you can easily get other electrical accessories (e.g. microwave synchronous motor) there with high quality and reasonable prices.

How to Choose an Electronic Alarm Clock?

Electronic alarm clock design features of electromechanical and digital alarm clocks. Selection of quartz alarm clock electromechanical type may be an excellent option. The alarms are not expensive, but the parameters they are much better than the mechanical. They are shock-resistant, and the clock start you do not need. Moreover, they have a very reasonable cost.

But quartz alarm clocks are not just cheap. Designed with all the knobs and switches, their use was most comfortable. Such a clock is winding no more than 2 times a year, when switched from winter to summer time and back and now have even less.

Quite popular now are digital alarm clocks. Equipped with a mass of options, they can support the installation of the signal repetition frequency or increase the volume of its sound. In addition to the luminescent backlighting, and there are watches (e.g. LED backlit clock), glowing all night. The design provides for their cost-effective dashboard that allows the long-term to replace the batteries.

Popular now are models without a key (e.g. touch light alarm clock). Manage alarm using the touch screen. There are special high-impact models that can withstand a fall from table height. Often, digital alarm clocks are fitted with an electronic thermometer. At the same time they are able to measure the temperature of the premises. Some of them are equipped with humidity sensor. There are models of digital alarm clocks, where the combined Service and works in AM / FM radio bands.

How to Pick the Lock If Lost Keys

Many found themselves in a situation where you need to get into the apartment, and from it there is no key. And, of course, very few people know how to pick a lock, and that it needs. The television often shows similar machinations. We believe that all this is very difficult. However, experts who possess this secret are convinced that it is the power of each. The main thing is to know how to use the tool.

Of course, only a thief or break-specialist knows how to break into the door lock. This will require not only a special master key, but also certain skills. Today issued a special allowance on this topic. Such materials are widely distributed in the web. Therefore, the practical skills to acquire are not so difficult. It takes only three months of serious study - and anyone calmly mastered how to pick the lock on the door. There are situations when there is no need to make any effort to open the door. You just need to buy special locksmith pick kit.

These locks have a high level of security, and many experts recommend is to install them. In this situation, the offender would be at an impasse. He may have a variety of tools for hacking, but only a keyhole can tell you where you need to make an effort to saw through strong steel pins. There are beams, door mounted in the mechanism, and how to pick the lock, it is difficult to imagine. Look anywhere you cannot, never seen anything. That is why the traditional ways of removing obstacles does not work here. It is necessary to look for an alternative. And demolished the door fully or punch a hole in the wall hardly anyone wants. And this is not a way out ... But if there is such a 15 in 1 lock pick set, it is likely to occur soon enough, and the mechanism of its breaking. BTW, you can select the lock pick set at Banggood. Besides, you can easily get other electrical accessories (e.g. skybox dongle) there with high quality and reasonable prices.

How to Use Punch Correctly

No repairs and no construction can do without the use of punch: this tool drills, drills and is used for demolition work. To punch served longer, it is important to know how to operate it. This tool is used for work on concrete, brick, stone, metal, also used as a conventional drill and hammer. They can drill any holes, remove the old tiles, and break through the floor or wall. The punch has a hammer mechanism - electro-mechanical or electro-pneumatic action. To turn it on, press the button. The main drawback of perforating guns - it is their considerable weight: there are instances of weighing more than 25 kg. For convenience, you can attach an additional grip of a soft material. It will reduce the intensity of the vibration.

Drilling tool switch is placed in front of the label in the form of a drill. Then you need to put the drill in the desired point and click the trigger. Excessive pressure on the punch with this mode of operation is not allowed. When using the drill bit chuck, "hammer drilling" and "counterclockwise rotation" may cause damage to the cartridge. To avoid such a situation, the tool is a function of the lock pin, it is necessary to drill holes in the metal and wood. Before plugging in the tool always check how it is set to.

Primarily, it is necessary to pay attention to the lubricant. If you have to work on concrete, on it is not worth saving. Periodically lubricate the cleaned grease shank drills (e.g. grease). Protect the tool from a large number of construction dust, you can use a shield made from the bottom of a plastic bottle. After turning off the gun, clean it with a damp soft cloth, pre-moisten it with soapy water. Make sure that the vent was completely cleansed from dirt.

When the tool breakage entrust repairs can only specialists from the service center. If operated punch has more power and bounce, will be a useful preventive inspection master. This will avoid problems that could cause injury. BTW, you can select the drill bit at Banggood. Besides, you can easily get other electrical accessories (e.g. black spacers) there with high quality and reasonable prices.

How to Seal the Speaker

If the speaker produces strange noises, it could be worn out. To seal the speaker enough glue "Moment" and a piece of cloth or bandage. If significant is damage, then there cannot do without soldering.

You will need

- Glue "Moment"

- Two pieces of thin fabric (you can bandage) or toilet paper

- Scalpel

- Tweezers.

Prepare a bandage or black speaker cloth. Then apply on the fabric glue and carefully sealed with internal and external parties. If you are afraid to hurt or not to glue, glue the only from the outside. Tinker with tweezers or a scalpel. Wait until the adhesive dries. If the problem is the speaker and, more than a hole in the fabric, then here is the following statement. First you need to unsolder all the live wire from the terminal block. Once the glue is dissolved, scalpel carefully to hook and throw the cap. The same action repeated with centering washer.

Now with acetone separate the suspension of the diffuser. Once separated, remove the diffuser with a centering washer basket. Now you have to rewind the reel. If the coil burned out at the bottom, then you first need to solder, but so as not to protrude from the base. When you are ready, you can begin to rewind. To do this, insert a tube of appropriate diameter into a coil and rewind all the old winding, noting at the same number of turns. Then solder a new coil to Piglet, and you are ready to assemble.

Cleans the basket and put to the diffuser. With the help center the film reel (film rolled into a ring and a core inserted between the speaker and the most coil). First you have to glue the suspension of the diffuser glue, and after drying the suspension centering washer (required to press the bonding locations). Once the adhesive is stiffened, tear off and check the progress of a photographic film spool. If everything is normal, attach the protective cap and place somewhere in the column during the complete drying. If the test can hear the crackling of the coil, it will have to unstick and re-check the winding or center washer. In principle, this is an entire process. Speaker, it is desirable to check on the rated power. BTW, you can select the black speaker cloth at Banggood. Besides, you can easily get other electrical accessories (e.g. mini bladeless fan) there with high quality and reasonable prices.

Installing Door Peephole

Ease door peephole in the fact that it can be used to survey the landing, while behind closed doors. The need of the subject caused by the same factors as the door chain is safety, safety and safety once again.

Before you buy the door view hole, as well as its selection and installation should be guided by the terms of security and the maximum viewing area, taking into account the material is actually the front door. Dear eyes level with the maximum viewing 180 degree peephole, so you can view the site until the rug under your door. A panoramic viewing angle of cheaper options is approximately 120 degrees and the special advantages of any efficiency or as browsing the site does not give.

If you are going by yourself to buy and install a peephole, do not forget to take into account the thickness of the fabric of its doors. The length of the eye of the body and its diameter you can easily choose from a wide range. Remember that the length of the eye can be adjusted manually using the carving on his body.

Traditionally door eyes are made of plastic and metal, while the optics of the glass and the polymer can be (as well as plastic). The advantages of glass optics is a high-quality image, resistance to mechanical damage (scratches and dust), and in the absence of turbidity. Eyes, the most optimum in quality and performance, have a metal housing and glass optics, but their cost is higher than that of low-end models peephole.

Installing eye on the door is carried out taking into account the growth of the landlord. It should be noted on the door of the center, based on the desired height, and outline the resulting awl mark - so the drill will not slip. Also, before marking space to install, paste a selected area of the door leaf strip of adhesive masking tape. Now you can put a notch, without fear of ruin facing the door. BTW, you can select the Door Peephole at Banggood. Besides, you can easily get other electrical accessories (e.g. Arduino sensor shield V5) there with high quality and reasonable prices.

USB Borescope Camera Review

Hello. I propose to review the inspection USB cameras. In domestic applications, it is small, but for many professions is useful. Proposed camera cable length is from 2 to 15 meters. I ordered a variant of 10m.

Specifications:

• External diameter: 7 mm
• Resolution: 640 x 480 (VGA)
• The LED: 6 white LEDs
• The USB interface: USB 2.0/1.1
• Waterproof level: IP67
• Cable length: 10 m

The USB borescope endoscope camera comes in the normal plastic envelope in the kit was another tip. The mirror allows you to see at an angle of 90 degrees in the thickest part of the diameter of 7 mm diodes and the lens is protected. Na picture it is not visible in the USB connector has an analog controlled brightness LEDs in a wheel. Computer camera automatically detected additional drivers are not required ... backlight makes it comfortable to see objects at a distance of 3-15 cm. The sharp image starts at 3 cm. Made a couple of shots (or rather this footage from the video), entering in through the bass reflex loudspeaker. The resolving power is enough to consider the details at close range. The device is of course entry-level, does not have a remote control head and a sufficient stiffness of the cable. Therefore penetrate five meters is possible only on a smooth tube or from the top down.

This Mini USB borescope uses optoelectronic technology to investigate hard-to-reach area. It helps you to diagnose broken part, weld point and machine equipment to save time and increase productivity. It is also can be used in medical treatment. This inspection camera has many applications including ear, nose oral & throat treatment, HVAC inspection, vent pipe, machine equipment, engine, automotive, boat, aircraft inspection.