Triangular LED Wood Clock Review

In this review, we will focus on the compact "desktop" clock acquired. The devices are available in four colors: brown body - red LED, black housing - Blue LED, white body - white LED light -Brown (bamboo) - the green LED. Between all the options present price difference 0.5 - $ 1 guess because LEDs used. For myself, I chose the first option, although it is also very popular with black. The package includes the triangular clock, USB cable (1m) for the external power supply and user manual in Chinese and English.

Functions and Features:

1. Power. Implemented by four AAA batteries type or from an external power supply DC5V / 500 mA supply. Also inside is already installed lithium battery to store information about the time and alarm clocks exhibited in memory when the power is turned off or the battery discharge.
2. Display information. The clock displays the time (in the 24H or 12H format selectable), the date (month, day) and temperature (Celsius or Fahrenheit selectable). A choice has two display modes:
3. Sound control. The manufacturer recommends that you use this function when using the power from the batteries. Its essence lies in the fact that the display lights up for about 14 seconds, and then goes into power saving mode (i.e. does not display information), and to enable it necessary, for example, clap your hands, or create any other noise. In the description of the store (in the Russian version) indicates that you can even pet them. Maybe I got a copy of, but this function is a maximum of one meter, then as I just do not slap they did not respond. You can set three alarm clocks. Beeping alarm clock in one minute is enough loud and disgusting to wake up.

The display has four modes of brightness L0, L1, L2, L3. C 18-00 automatically goes into brightness L1 mode (even if it was in before the L0) passes and 7-00 in the initial position. On the whole night not really interferes in any of the modes of brightness, and the day is also quite clearly seen (of course not in direct sunlight).

To complete the survey decided to dismantle the watch. I do not understand, but if welded good in a dress and chips. At first I thought that the plastic panel is installed only on the snap, but it turned out that she is also glued on the perimeter. Just glued and board with LEDs, so he did not retrieve it. BTW, you can select the Triangular LED Wood Clock at Banggood. Besides, you can easily get other electrical accessories (e.g. DIY FM radio) there with high quality and reasonable prices. 

Step Down Power Supply

These devices can be attributed to the so-called "economy-class", which can be used for a large number of measuring tasks without compromising your budget. Here, in any case does not go talking about the poor quality of the product for many applications simply require inexpensive "workhorses" that are distinguished by reliability and provide the stated metrological characteristics that are usually confirmed by the certificate of approval of the SI and the inclusion in the State Register of measuring instruments. The device is a measuring equipment production "Profigrupp" (St. Petersburg, Russia). These devices are widely used by industrial enterprises of various branches, academic and educational institutions, and service centers.

Stabilized DC power supplies are one of the main components of any test system in various industries. They are designed to produce a constant voltage or current of high stability. The operating principle of power supplies are divided into linear and pulse. Traditional - linear power supplies are built on the classical scheme, consisting of a high-power transformer and a control circuit. Switching power supplies convert AC voltage is performed in the rectangular pulses of sufficiently high frequency (tens to hundreds of kHz), followed by transformation and adjustment. Each of these types of power sources has its advantages and disadvantages. It should include a low level of radiated noise, simplicity of design. Cons linear power supplies - the big weight and size characteristics (due to powerful transformer) and low efficiency. Relatively miniaturized and have a high efficiency, so their use is particularly relevant in cases where weight is critical, the size and power consumption. Unfortunately, switching power supplies have a relatively high level of radiated interference. Therefore, linear power supplies are a practical solution for work in laboratory and production environments, especially when the device under test is critical to radiated interference.

B5-PRO is stabilized linear power supply with adjustable output parameters: voltage and current. Power data source is from 90 to 360 watts. Power supply B5-PRO series are easy to operate and has high reliability. BTW, you can select the step down power supply at Banggood. Besides, you can easily get other electrical accessories (e.g. Bluetooth relay module) there with high quality and reasonable prices.

How to Use the Master Keys: the Classification of Master Keys

Skeleton Key is a tool that is not only and not so much a criminal purpose. The use of master keys are widely distributed in the framework of safety examination methods locks, open the door after a key loss, if necessary, with forensic procedures. Enjoy the master keys are not only thieves, as is commonly believed, but also fitters, mechanics, lifeguards, even to people who have got into difficulties associated with the need to get into your own home in an emergency.

Know how to use master keys, it is useful not only for people who have decided to embark on the path of crime, but also to all who in certain situations need to get into the locked room. Using the master key is a fairly standard procedure at the opening of the lock, "home" key of which is broken or lost. To determine the order, how to make a master key for the lock, it is necessary to understand the material, at least superficially. The following types of locks, master key unlocks: Finnish or disc; cylinder; lever; electronic door locks (e.g. Klom cross tools); primitive locks - latch and bolt. It is believed that in the modern variety of locking mechanisms, the uniqueness of each castle and use of new technologies, the master key no longer cope with their tasks.

Before you make a master key, you should ensure that you have the necessary tools, materials and availability of skills. Creating a master key demand: the machine or the winepress, in extreme cases, the drill; grinding wheel; folding metal meter; metal hexagon for the capstan; test object - larva required lock type; vise a mechanical lock.

To understand how to open the lock master keys, you must have a general idea of the appointment of various tools and "the boundaries of the possible" for them. Flat jimmy works on window latches and locks without locking tabs or with a weak fixation. Wire hook for Finnish locks and simple cylindrical models. Billets key - type of lock picks, simulating common form of key locks for a particular type. Dialers keys are for sophisticated locks. Klom electric pick is with the vibration of the simple keys and a magnetic element for electric locks.

Creating and using a master key, it is worth remembering that the Russian licensing legislation includes such activities, opening other people's doors without a license will be considered very clearly.

How to Make a Digital Microscope

Ordinary microscope is inconvenient in that it is necessary to look with one eye, which quickly leads to fatigue. This disadvantage is absent in binocular microscopes and devices equipped with special cameras.

Buy a USB digital microscope endoscope magnifier, a lens which is not recessed into the body and protruding from it at least a centimeter. Inside the nozzle make cylindrical recess corresponds to the diameter and length of the lens and eyepiece with a small margin, to the nozzle can be put on and removed without much effort. Between the depressions proceed through a hole with a diameter equal to the arithmetic mean between the objective lens and eyepiece. One of them has an inner diameter should be equal to the diameter of the eyepiece, the other - the diameter of the lens. Tubes must fit snugly into each other.

With the nozzle adapter, install the webcam on the microscope. Connect it to your computer, set up all the necessary software (as it depends on what the machine is running - Linux or Windows). Initially, you will see a black background. Turn on the lamp microscope and place the drug on its object table. As a self-made product can be used with sheared finger burrs, sandwiched between two thin glass. First, adjust the light (light spot center should coincide with the center of the screen), and then focus (to be seen in detail the structure of the drug). Carefully expand the camera so that the image on the screen was inverted or angled. You will quickly appreciate the convenience of a digital microscope, which almost does not strain vision and to take a photo. BTW, you can select the USB microscope 500x at Banggood. Besides, you can easily get other electrical accessories (e.g. inspection snake camera) there with high quality and reasonable prices.

Torment with LED Cube 4x4x4

I'll tell you about my experience with Ardiuno UNO and even show you that I have finally succeeded. If you still not tired like - welcome under the cut. That's what you were doing on New Year's holidays? I do most of the holidays carry with Arduino.

First collected cube of 27 LEDs (it seems on here of this manual). Sketch original version of the work (as in the video) is not spread, because it should be completely rewritten, taking into account new knowledge. But he initially worked like this:

Manage the 4x4x4 LED cube so it was pretty easy. The problem was that all 20 of my existing Arduino UNO output LEDs were busy and wanted to connect more what some sensors and other delights.

As a result, a certain amount of dead nerves and thanks to the help of good people could reconnect to my cube Arduino using two 74HC595 shift registers. During the writing program I have a little better understanding of the language, though some things in my program still seems to me the magic.

Actually, the control cube became a little more difficult, but managed to connect the two-line display, which displays the name of the operating mode of the cube and the number of modes (handy to pick a program, seeing this info), and a button that switches the operating mode of the cube.

Oh, I forgot to say. My wife leads computer science at the same school and, looking at my suffering, she was born the idea of ​​elective courses for grade 9 (while still in the form of ideas and rough drafts) to work with Arduino. Let us hope that this is something out. BTW, you can select the 4x4x4 LED cube at Banggood. Besides, you can easily get other electrical accessories (e.g. violet laser module) there with high quality and reasonable prices.

The Detector Receiver with Your Hands

The article will be fully investigated crystal set, its main components and the possibility of upgrading this simple device. For the normal functioning of the receiver requires careful selection of elements from the parameters. But he is very picky about the design of the antenna and the ground, as the receiver is no power supply. It works solely through the electromagnetic field generated by a radio transmitter. This is both an advantage and disadvantage of the radio, collected under the scheme. Work it can virtually forever as long as they broadcast the radio. But the sensitivity is extremely low, and is able to take only very strong signals.

Special requirements apply to the construction of the antenna. It was she who performs in a detector radio power supply function. Hence it is possible to conclude that the use as a detector receiver power supply is quite simple. But there are some shortcomings, which will not get rid of. In particular, the output voltage is very low, even if the radio is tuned to the frequency of the transmitter signal. In other words, you will not collect a lot of potential antenna. However, it should ensure the stable operation of the device. For this purpose, we use several types of antennas, but the most popular and simplest is the "long beam."

At a height of not less than three meters has to hang the wire segment. Its length should be not less than ten meters. It is desirable to use copper wire in insulation varnish (Note: this must be applied precisely later in the inductor). Wire thickness greater than one millimeter. As you can imagine, it will be suspended in two places, the edges must be sealed. Otherwise, all the energy will go into the ground. Conduct insulation best with ceramic elements. Wire reduction is done from one edge of the antenna, is soldered securely to the web at a distance of 30-50 cm from the end. BTW, you can select the aircraft radio receiver kit at Banggood. Besides, you can easily get other electrical accessories (e.g. 12V gear motor high torque) there with high quality and reasonable prices.

The Lamp Transceiver by Our Own Hands

The lamp transceiver is a device which is intended to transmit signals of a certain frequency. Typically, it is used as a receiver. The main element of the transceiver is considered to be a transformer, which is connected to an inductor. Feature modifications lamp is a low-frequency signal stability.

In addition, they are distinguished by the presence of powerful capacitors and resistors. The controllers are installed in a wide variety of device. To eliminate various electromechanical systems interference filters are applied. Today, many are interested in the installation of low-power transceivers 50 watts.

Transceivers, short-wave (SW)

To make the HF transceiver with your hands, you must use a low power transformer. In addition, care should be taken about the amplifiers. Typically, in this case, the signal throughput increases significantly. To be able to deal with noise, the device is set zener. Some make their own hands HF pixie transmitter, using the coil, which must withstand the maximum resistance of 9 Ohm. Checking the device is always on the first phase. In this case, contact should be set in the upper position.

The antenna and transceiver block HF

The antenna for the radio is made with various conductors. Additionally it requires diode pair. Antenna bandwidth is tested for low-power transmitter. Once your device requires an element such as a reed switch, it is required for signal transmission to an external inductor winding.

In order to make the power supply of the transceiver with your hands, you need a high-frequency generator, which runs on a pair with mixer. In addition, specialists use capacitors of different capacities. Maximum voltage device must be capable of 50 V. The limit frequency in this case does not exceed 60 Hz. To solve the problems with electromagnetic interference special circuits are used. The device they are designed also for voltage doubling. BTW, you can select the Lamp Transceiver at Banggood. Besides, you can easily get other electrical accessories (e.g. black nylon spacers) there with high quality and reasonable prices.