Electronics

Basic Electronics – Resistor Combinations

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RESISTOR COMBINATIONS When we do not get specific resistor values we have to either use variable resistors such as potentiometers or presets to obtain such precise values. Pots are too expensive to use forevery case. Another scheme is to combine two or more resistors to obtain the necessary precise values.Such resistor combinations can cost as […]

Electronics

LED Basics

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Today LED has become an integral part of consumer electronics. LED TV, LED Display, LED Lights and so on. These are becoming very popular because of there low power consumption. What is LED? LED stands for Light emitting diode. A light emitting diode is essentially a PN junction semiconductor diode that emits a monochromatic(single) colour […]

Electronics

Basic Power supply circuits Part 1

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To understand power supply circuits, we need to understand rectifiers. A rectifier converts AC or alternating current to DC direct current. Rectifiers are used in Power supply circuits which we will discuss in detail. The process of converting AC to DC is called Rectification. Half wave rectification. It requires only single diode. Only positive cycle […]

Electronics

Basic Electronics – 2

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Passive Components RESISTORS To oppose the flow of electrons ( current). The symbols are shown below. Resistance is measured in units called “Ohm”. 1000 ohms is shown as 1k ohm (103 ohm) and 1000 k ohm is shown as M.ohms (106ohm). Resistors can be broadly of two types. • Fixed Resistors and Variable Resistors. Fixed […]

Electronics

Basic Electronics – 1

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Introduction Electronic component can be divided into 2 types: Active and Passive components Resistors and Capacitors etc. are known as passive components because they can only attenuate the electrical voltage and signals and cannot amplify. Devices like transistors and operational amplifier(op Amps)can amplify or increase the amplitude and energy associated with the signals and so are […]