Differential Amplifier using Transistors

As the name indicates Differential Amplifier is a dc-coupled amplifier that amplifies the difference between two input signals. It is the building block of analog integrated circuits and operational amplifiers (op-amp). One of the important feature of differential amplifier is that it tends to reject or nullify the part of input signals which is common to both inputs. This provides very good noise immunity in a lot of applications. Let's see the block diagram of a differential amplifier. Differential Amplifier Vi1 and Vi2 are...

July 24, 2016By Lakshmisree GopalBasic Electronics, Electronics, OpampAmplifier, BJT, Opamp, Transistor2 CommentsRead more...

Rain Alarm using 555 Timer

Here is a simple and interesting hobby circuit that can be made using the popular 555 timer IC. As you might already know, a 555 Timer can be easily wired as Astable, Monostable or Bistable multivibrator. This circuit can be used as rain sensor, water overflow sensor or as a water level sensor. This circuit make use the principle that normal water can conduct some amount of electricity (PURE water is not...

June 26, 2016By Ligo George555 Circuits, Electronics, Hobby Circuits, Projects555, Alarm, Rain, Sensor1 CommentRead more...

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...

May 9, 2016By Ligo GeorgeElectronicsDisplay, LCD, light, Polarization1 CommentRead more...

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,

April 28, 2016By Ligo GeorgeElectronics, PCB Designing, Promotional, TutorialsCloud, Cloud Computing, EDA, pcb, PCB Designing0 CommentsRead more...

Automatic Night Lamp using LDR

Automatic night lamp as the name suggests is for turning ON and OFF the lamp automatically without the need of human interventions. It senses the light intensity from surroundings and find whether its day or night. And it automatically turns ON when the surrounding is dark and it turns OFF when it receives light from surroundings. A sensor called LDR is used to detect the light intensity. This project finds wide outdoor applications in streets, gardens and public places where...

February 12, 2016By Arun BhaskarElectronics, Hobby Circuits, ProjectsLDR20 CommentsRead more...

12V Capacitor Dropper Power Supply Output

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...

February 7, 2016By Ligo GeorgeElectronics, Hobby Circuits, ProjectsCapacitor, Power Supply23 CommentsRead more...

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...

January 30, 2016By Ligo George555 Circuits, Electronics, Hobby Circuits, Projects5554 CommentsRead more...

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 Timer...

January 3, 2016By Ligo George555 Circuits, Electronics555, Bistable, Flip Flop, Latch, Multivibrator0 CommentsRead more...