Electronics

10 Stage LED Sequencer

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10 Stage LED Sequencer Components   IC1- CD4017 IC2- NE555 C1 – 1μ C2- 0.01 μ R1 – 470 Ω R2 – 100 KΩ R3- 100 Ω LED1-10 – RED LED 9volt DC power supply.                               For power supply you can use 9 volt […]

Electronics

Variable DC Power Supply using LM317

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Below is the circuit for variable dc power supply R1- 240 Ω R2- 5K VR R2 can be replaced by fixed value resistor for fixed power supply. Following formula can be used to calculate output voltage. Vo=1.25(1+R2/R1) Output voltage should be2 voltage greater than input. Parts for current setup  D1, D2 – 1N4001 C1-0.1 μ C2 – […]

Electronics

20 Watt Inverter

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This circuit will drive a 40 watt fluorescent or two 20-watt tubes in series. The transformer is wound on a ferrite rod 10mm dia and 8cm long. The wire diameters is 0.61mm wire for the primary and 0.28mm wire for the secondary and feedback winding. The circuit will take approx. 1.5amp on 12v, making it […]

Electronics

Lamp Dimmer

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12v LAMP Dimmer Parts IC 1 – NE555 Transistor – 2N2955 -1 Resistance – 1k(2 no.), 100 Ω Variable Resistance – 50k Capacitor – 0.1 µF Diode – 1N4001 – 3  12v 2 amp Bulb Input Voltage is 12v. To create your own bench top power supply use the circuit shown in http://digitalab.org/2012/06/regulated-dc-power-supply-circuit/  

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 […]