Electronicsunit Blog

007.23.09 Self Drive Tour South Africa

to Telecommunication & Broadcasting — Tags: ,  

The self drive or FIT (Flexible Individual Travel) tour option is one of the most cost-effective ways to tour this fascinating region of Southern Africa. Tour South Africa and the region at your own pace with a large degree of flexibility. You can choose the type of car for hire, the standard of the accommodation, the time of the year to visit, the duration of your self drive tour, which regions and most importantly, you can select a tour itinerary that fulfills your personal interests. A tour that can include – wildlife, nature, culture, history, sightseeing, bathing, sport, adventure or just a little bit of everything. all Selfdrives inbound tours are BONDED through SATSA offering you greater security and protection.

Beautiful Scenery

Zoo-Free Driving Areas

Zoo-Free Driving Areas

The most important aspect of a tour to South Africa or Southern Africa is the planning and it is therefore pretty handy to have someone like us on your team, that has the experience, expertise and knowledge of the region.

Attention: If you would like to go on a Self Drive Tour, you may do some preparation first. Such things you may have to prepare besides you have already owned a good car such as SUV or MPV, they are commodities, drugs, clothes, vehicle accessories and don’t forget the Car GPS Navigation!

Now let me introduce several GPS systems to you:

1. Navigon 7200T

The Navigon 7200T offers an attractive design and plenty of features, including voice address entry, 3D landmark renderings, text-to-speech functionality, and integrated Bluetooth. The user interface and maps still aren’t as clean as a Garmin or a TomTom, but performance has improved and address entry by voice can be quite accurate with some training

Navigon 7200T

Navigon 7200T

2. Magellan Maestro 4370

Despite a couple of minor performance issues, the Magellan Maestro 4370 offers convenience through its new OneTouch interface, providing you with quick one-click access to your preferred destinations. The GPS also delivers with features and accurate directions.

Magellan Maestro 4370

Magellan Maestro 4370

3. TomTom ONE 125-GPS receiver

The TomTom One 125 isn’t the newest or flashiest portable navigation device on the market, but that’s OK. Not everyone needs the latest or greatest. What the One 125 offers is a solid, entry-level GPS for first-time buyers or for those looking for the most basic navigation functions.

TomTom ONE 125 - GPS receiver

TomTom ONE 125 - GPS receiver

007.22.09 Without step motor, Optimus Prime is just a pile of scrap metal

to Electric Motor — Tags:  

Hello everyone! Have you seen the film Transformers: Revenge Of The Fallen. If you have seen it, may I ask you a question: What do you think of Optimus Prime ? First I tell you my answer: I think he is a man with great power and justice.

But don’t forget he is a robot, he is made up of different parts. and if he wants to move freely, one thing is indispensable, that is step motor .

A stepper motor is an electromechanical device which converts electrical pulses into discrete mechanical movements. The shaft or spindle of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence. The motors rotation has several direct relationships to these applied input pulses. The sequence of the applied pulses is directly related to the direction of motor shafts rotation. The speed of the motor shafts rotation is directly related to the frequency of the input pulses and the length of rotation is directly related to the number of input pulses applied.

Optimus Prime

Optimus Prime

So I have just tell you what is a step motor, now I will tell you why does Optimus Prime can not live without the little things. Look at the picture, you can find there are a lot of joints on his body. The joints can make he move, jump and fly freely. The most important is that one part of a joint is step motors.

step motor 1

step motor 1

Now let’s look at the advantages of it:

1. The rotation angle of the motor is proportional to the input pulse.

2. The motor has full torque at standstill (if the windings are energized)

3. Precise positioning and repeatability of movement since good stepper motors have an accuracy of 3 – 5% of a step and this error is non cumulative from one step to the next.

4. Excellent response to starting/stopping/reversing.

5. Very reliable since there are no contact brushes in the motor. Therefore the life of the motor is simply dependant on the life of the bearing.

6. The motors response to digital input pulses provides open-loop control, making the motor simpler and less costly to control.

7. It is possible to achieve very low speed synchronous rotation with a load that is directly coupled to the shaft.

8. A wide range of rotational speeds can be realized as the speed is proportional to the frequency of the input pulses.

Turn to the next topic, now you may ask if I want to make a robot or other thing, when do I need step motors, so let me tell you briefly:

step motor 2

step motor 2

A stepper motor can be a good choice whenever controlled movement is required. They can be used to advantage in applications where you need to control rotation angle, speed, position and synchronism. Because of the inherent advantages listed previously, stepper motors have found their place in many different applications.

007.22.09 I Know Harry Potter is a Record Breaker

to Breaker & Protector — Tags:  

There is no doubt that the Harry Potter franchise has been very successful at the box office. Even when first Harry Potter was debuted in 2001, it was able to pull in more than $300 million. This year, the latest Harry Potter film Half-Blood Prince is expected to do better.

harry potter

Harry Potter

I have been watching Harry Potter since I was a Junior school student, I know it always plays as the role of a record breaker.

Well, when I write down the word “breaker”, and as an Electrical engineer for a professional quality,  I would like to tell you another kind of breaker: The PD-Series SmartGuard circuit breaker.

The PD-Series SmartGuard circuit breaker from Carling Technologies is an equipment ground fault protection device that functions as a standard high-quality hydraulic/magnetic circuit breaker, offering customised overload and short circuit protection.

PD-Series SmartGuard circuit breaker

PD-Series SmartGuard circuit breaker

As an additional feature, the breaker senses and guards against faults to ground using an integrated circuit developed by the manufacturer. This technology detects faults and when a fault occurs, the breaker trips and an LED illuminates, giving a clear indication that the trip occurred as a result of leakage. This protection helps prevent serious equipment damage and fire.

The PD-Series circuit breakers come in 1 to 3 poles with switched or unswitched neutral options. They have a short circuit interrupt capacity up to 5000 amps, current ratings up to 50 amps, voltage ratings up to 480 V a.c., and equipment leakage sensitivity from 7 to 100 milliamps. They offer front panel or DIN rail mounting options, and are available with handle style actuators with an optional handle guard.

PS:If you have questions ,you can contact me !

007.21.09 Let Me Tell You Something About Optical Fiber

to Cable & Wire, Optical Fiber — Tags: ,  

You know during one’s childhood, there’s always too many questions for them to ask, the outside world is colorful and in bizarre.

I have heard optical fiber for the first time on my first physics class, and I have spent a lot of time on it. Now let me tell you something about optical fiber.

An optical fiber is a glass or plastic fiber that carries light along its length. Fiber optics is the overlap of applied science and engineering concerned with the design and application of optical fibers. Optical fibers are widely used in fiber-optic communications, which permits transmission over longer distances and at higher bandwidths (data rates) than other forms of communications. Fibers are used instead of metal wires because signals travel along them with less loss, and they are also immune to electromagnetic interference. Fibers are also used for illumination, and are wrapped in bundles so they can be used to carry images, thus allowing viewing in tight spaces. Specially designed fibers are used for a variety of other applications, including sensors and fiber lasers

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1

optical fiber

Light is kept in the core of the optical fiber by total internal reflection. This causes the fiber to act as a waveguide. Fibers which support many propagation paths or transverse modes are called multi-mode fibers (MMF), while those which can only support a single mode are called single-mode fibers (SMF). Multi-mode fibers generally have a larger core diameter, and are used for short-distance communication links and for applications where high power must be transmitted. Single-mode fibers are used for most communication links longer than 550 metres (1,800 ft).

Joining lengths of optical fiber is more complex than joining electrical wire or cable. The ends of the fibers must be carefully cleaved, and then spliced together either mechanically or by fusing them together with an electric arc. Special connectors are used to make removable connections.

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