Transformer is an electrical device which works on the principle of Faraday’s law of electromagnetism used to step up or step down the input [[wysiwyg_imageupload::]]voltage.Transformers are of different types for example: Power transformers, Current Transformers, Potential Transformers, Pulse Transformer, RF Transformer and Audio transformers. The most common application of Current transformer is to reduce the current and provide galvanic isolation in current sensing devices. Some typical examples include SMPS, motor control and electronic lightning ballasts.Some of you would know how a current transformer works. Windings, Core, connections and other things which many of you have surely seen in the books or  in the diagrams.But how many of you have got the chance to see how actually it looks from inside. A small instrument but which works greater than its size. In today’s insight you will know how current transformers are made to work. 

A transformer is an apparatus for converting electrical power in an ac system at one voltage or current into electrical power at some other voltage or current without the use of rotating parts. Transformers have been an essential component in electrical as well as electronic circuits. Apart from stepping up or stepping down the voltages, they are used for providing isolation, for impedance mismatch and so on. Development of new technologies has reduced the usage of transformers, but still they are quite vital in many applications. 

Amazed by the electronic music of your favorite band? Mesmerized by the way suddenly an electric guitar goes as loud as the singer? Like most of know, there is an expert recording engineer present in the studio to make sure that music instruments and the voices make a perfect blend. A critical device that helps in creating this blend is an audio transformer. Works just like any other conventional transformer; audio transformers are designed to work at audio frequencies, i.e. between 20Hz to 20 KHz. interestingly, the initial need to design to such transformer was to enhance long distance voice communication. Now serving essentially for professional musicians, audio transformers stand as one electronic-audio component. This article will cover technical and applicative features of audio transformers explaining how they are different from the conventional counterparts 

Magnetic ballast is an essential component in traditional discharge lamps and tubes. In order to properly start them, an initial high current is needed which needs to be limited afterwards to prevent the lamp from blowing out. This function is performed by ballast. Electro-magnetic ballasts were one of the first components that could provide sufficient starting current to fluorescent lights or low pressure tanning lamps. Although they are being replaced by much lighter and efficient, electronic ballasts, electro-magnetic ballasts are still in trend. This article will explore the structural features of the ballast and it’s working.Numerous manufacturers are producing their own customized versions of Magnetic ballasts. Depending upon the brands, size and the power requirements, ballasts can be of various types. The casing is made of Aluminum and has the specifications featured over it. On its side are two connecting plugs which connect the ballast to the fluorescent light.  

A trimmer or preset is a miniature adjustable electrical component. Trimmers can be variable resistors (potentiometers), variable capacitors, and trimmable inductors. They are common in precision circuitry like A/V components, and may need to be adjusted when the equipment is serviced. Unlike many other variable controls, trimmers are mounted directly on circuit boards, turned with a small screwdriver and rated for many fewer adjustments over their lifetime. Trimmers like trimmable inductors and trimmable capacitors are usually found in superhetrodyne radio and television receivers, in the Intermediate frequency, oscillator and RF circuits. They are adjusted into the right position during the alignment procedure of the receiver. Trimmers come in a variety of sizes and levels of precision; for example, multi-turn trim potentiometers exist, in which it takes several turns of the adjustment screw to reach the end value, allowing for very high degrees of accuracy. 

TransformerStep up transformer increases the magnitude of voltage while step down transformer decrease the magnitude of voltage. Depending on the ratio of the number of turns in the primary & secondary winding a transformer is characterized as step up or step down. is an electrical device used to step up and down the AC voltages. There are two types of transformers: Step up and step down transformer.When a varying current enters in the primary coil of the transformer, it generates a magnetic flux in the core and thus a varying magnetic field in the secondary coil. This varying magnetic field across the secondary coil produces a voltage in secondary coil. This effect is called mutual induction.