Author - Ligo George

LCD Display – Fundamentals

LCD Glass Panel - Liquid Crystal Display LCD or Liquid Crystal Display is a flat electronic display which is very commonly used in digital watches, calculators, laptops, televisions etc. It make use of light modulating properties of  liquid crystal and polarization of light for its operation. Low power consumption, less thickness and less weight of LCD enables its use in battery powered and portable applications. Prerequisites Light is an electromagnetic radiation which stimulates sight and make things visible. It is produced by vibration...

EasyEDA – A Cloud based PCB Design Software

Cloud computing is an internet based computing which relies on sharing computer resources. It enables us to use computer resources or processing power as a utility similar to using electricity. So we don't need to make big computer infrastructure in our building, just use the cloud resources whenever there is a need. Nowadays everything become cloud computing, like cloud storage, word processing, business analytics etc. What is the role of cloud computing in electronics ? The question ends here, EasyEDA....

I²C Communication with PIC Microcontroller – MPLAB XC8

I2C or IIC or I2C stands for Inter-Integrated Circuit. It is a very popular multi-master, multi-slave serial communication interface developed by Philips. I2C uses two bidirectional open drain data lines, Serial Data (SDA) and Serial Clock (SCL) with pull up resistors as shown below. Unlike UART, you can connect and communicate to multiple devices using the same I2C bus. I2C Communication I2C is a master slave protocol. It means that devices connected to I2C bus will be either master or slave. The master is...

Transformerless Capacitor Dropper Power Supply

I already posted about transformerless power supplies in the article, Transformerless DC Power Supply. Here we will see how to design a capacitor dropper power supply. Capacitor power supplies are simple, low cost and light weight solution for providing dc supplies to circuits which require low currents. It is low cost and light weight since there is no bulky transformers. Circuit Diagram Transformerless Capacitor Power Supply 12V 40mA The 200mA fuse will protect the circuit from mains during shot circuit or component failures. The...

Simple Electronic Piano using 555 Timer

A simple electronic toy piano can be easily constructed using the popular 555 timer IC. 555 Timer can be easily wired as Astable, Monostable or Bistable multivibrator. We all know that Sound is a Mechanical Wave as it is produced by to and fro movement of particles of the medium. Displacement of particles are in the same direction as propagation of sound waves, so sound is a Longitudinal Wave. The to and fro motion of particles in the medium creates...

Bistable Multivibrator using 555 Timer

As the name indicates, a bistable multivibrator has 2 stable states. It can be switched from one state to another by providing an external trigger. It can be used for storing a binary digit (bit) as it has 2 stable states (0 or 1). So it is commonly used in digital circuits, where it is named as Flip Flop or Latches. A bistable multivibrator can be easily constructed using the most popular and low cost 555 Timer IC. Circuit Diagram - 555...

Using ADC of PIC Microcontroller – MPLAB XC8

In this tutorial we will learn, how to use the ADC module of a PIC Microcontroller using MPLAB XC8 compiler. For demonstration we will use the commonly available PIC 16F877A microcontroller. Every physical quantity found in nature like temperature, humidity, pressure, force is analog. We need to convert these analog quantities to digital to process it using a digital computer or a microcontroller. This is done by using Analog to Digital Converters. An Analog to Digital Converter or ADC is a...

Monostable Multivibrator using Transistors

Multivibrator is a non linear oscillator or function generator which can generate square, rectangular and pulse waves. Monostable Multivibrator or One-Shot Multivibrator has only one stable state. By default monostable multivibrator will be in its stable state, but when triggered it will switch to unstable state (quasi-stable state) for a time period determined by the RC time constant in the circuit. Monostable Multivibrator using Transistors - Circuit Diagram Monostable Multivibrator using Transistors - Circuit Diagram In the above circuit diagram we can find two transistors which...

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