what is the purpose of lm317 ic in the auto turn off mobile charger ....etc

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Variable Power Supp ly withDigital Control
The most frequently used device inelectronic workshops and laboratoriesis a universal power supply provides a variable, fluctuation-free output.Here we present a variable power supplywith digital control that is simple and easyto construct.The circuit is built around an adjustable3-terminal positive-voltage regulatorIC LM317, CMOS decade counter ICCD4017, timer IC NE555 and 3-terminalfixed negative-voltage regulator LM7912.The AC mains supply is stepped downby transformer X1 to deliver a secon ....etc

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A Digital DC Power Supply (programmable bench power supply unit), hardware version 3.0
Abstract:
A good, reliable and easy to use bench power supply unit is probably the most important and most used device in every electronic lab.
A proper electronically stabilized bench power supply unit is an important but also expensive device. Using a microcontroller based design we can build a power supply which has a lot of extra features, is easy to build and very affordable.
The tuxgraphics digital DC power supply ....etc

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Introduction

An inverter is an electrical device that converts direct current (DC) to alternating current (AC); the converted AC can be at any required voltage and frequency with the use of appropriate transformers, switching, and control circuits.
Static inverters have no moving parts and are used in a wide range of applications, from small switching power supplies in computers, to large electric utility high-voltage direct current applications that transport bulk power. Inverters are co ....etc

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Variable Voltage And Variable Frequency drives

Presented By:
P.NATARAJU S.E.V.S.RAGHU VARMA
3rd year E.E.E. 3rd year E.E.E.

Abstract:-
Our varying industrial needs demand more precise control of the outputs of our basic electrical prime movers i.e, THE MOTORS. Basically dc motors are easy to control compared to their ac counter parts, but they have their own limitations with increase in capacity. Conversely ac motors in particular squirrel cag ....etc

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plz i need variable dc power supply using ic lm317 project report and seminar report on lm317ic ....etc

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3. BLOCK DIAGRAM OF 12V DC BOOST REGULATOR
The figure shows the simple block diagram of the 12V dc boost regulator. Each block can be separately assembled and checked. The functioning of each block is discussed below.
Figure 3.1 Block Diagram of 12V DC Boost Regulator
3.1 DC SUPPLY
It is the external dc input applied to the circuit. The boost regulator circuit corrects variations in the supply voltage. Additional current is drawn by the boost circuit to get the required output voltage.
3.2 LOW VOLTAGE ....etc

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How to step down 230v to12v PDF download ....etc

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i want assembly lang coding for this pls sent me as soon as posible this is my mail id [email protected] ....etc

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