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The choice of the right AC motor drive (VFD) for the application is very important and has great influence on its lifetime. If the capacity of AC motor drive is too large, it cannot offer complete protection to the motor and motor maybe damaged. If the capacity of AC motor drive is too small, it cannot offer the required performance and the AC motor drive maybe damaged due to overloading. But by simply selecting the AC motor drive of the same capacity as the motor, user application requirements cannot be met completely. Therefore, a designer should consider all the conditions, including load type, load speed, load characteristic, operation method, rated output, rated speed, power and the change of load capacity . The following table lists the factors you need to consider, depending on your requirements. Selection Note for VFD Why to use Choke for VFD? When the AC Motor Drive (VFD) is connected directly to a large-capacity power transformer (600kVA or above) or when a phase lead cap...

Watching movies is a neat escape from the stressful lifestyle we live in. Watching movies in a wide screen and surround sound take you far away and into the movie scene you are watching. You watch it as if you were there in the movie scene. Of late, we can only experience this escape in a cinema. However, modern technology may be able to provide this same sight and sound experience right in your own living room. We will discuss the basic components of a home theater system in this article. Read on to understand how these basic components can deliver the best cinematic experience to a home theater system. Home theater experts state that the most important consideration in setting up a home theater system is the size of the room where you will set up the home theater system. The most important component of the home theater system, which is the television, is dependent on the size of the room. Although, the recommendation is 27 inches television set at a minimum is necessary for your home...

How to build a automatic lighting controller circuit. The governor following is intended to regulate the light intensity incandescent 220 V. The components in a relatively few, which means it can easily be mounted onto a small plate. After the build, we recommend you place it inside the box which is flush mounted switch ON / OFF the lamp. Setting the switch to ON, the lamp will light after about 400 msec, a delay is probably negligible. Automatic Lighting Controller Circuit Diagram: But when the state enters the ON OFF, then mesolathei a period of 20 sec, the brightness of the lamp remains unchanged to start falling out soon after.  The last feature is particularly useful when we want to have a little time from the moment you 'close' switch. Once the switch S1 set to ON, the capacitor C2 begins to charge through R1, C1 and bridge D1-D4. The Zener diode D5 limits the voltage across the capacitor to about 15 n. After awhile, the diode D6 LED illuminates, causing the appearance of...

The post explains a novel way of using an ordinary SMPS unit for charging a battery via a solar panel. The method will result in an extremely efficient and fast solar charging of the connected battery. SMPSs have become very common nowadays and we find them being used in the form of of low voltage DC units wherever needed. The best example is our cell phone chargers which are actually compact SMPS 5V chargers. Solar charger devices are also becoming popular nowadays and folks are constantly in look out for options in the form of solar chargers having the most efficient charging response. Solar panels or PV devices are normally utilized for charging lead acid batteries which tends to take relatively long hour for getting fully charged, and especially when the sunlight conditions are bad things start getting even more sluggish. For tackling the above condition or rather for enabling quicker charging from solar panels, special MPPT based soar chargers have been developed which effecti...

Photo: firstpost.com     It has happened to everyone at some time: Just when you were in the middle of an animated conversation with someone on your cellphone, the battery gave up its ghost and went dead on you. Cursing the phone or even yourself had not helped any, had it? It is precisely with this in mind that various entities have been trying to get the batteries recharge themselves. Read More.....

Hi friends... I hope u all will be gud.Today i am here again with another article.This article is basically for those peoples who just start electronics practically.In this article i will discuss about Breadboard uses.Because it is very necessary if you are going to make your electronic project.Then you must have knowledge about Breadboard .Generally most of the electronic projects starts their life on a breadboard and then on PCBs and all. Go through the article and learn how to use a bread board.   INTRODUCTION   A breadboard also is known as protoboard . It is a type of solderless electronic circuit building .You can build a electronic circuit on a breadboard without any soldering ! Best of all it is reusable. It was designed by Ronald J Portugal of EI Instruments Inc. in 1971.    HOW IT WORKS   There are a lot of holes in the board to place components and power supply. Actually these holes are arranged in a particular fashion and these are shorted with meta...