Electronic Circuits and Diagram-Electronics Projects and Design

TRANSFORMER-COUPLED CLASS A POWER AMPLIFIER This is also sometimes referred to as single ended power amplifier. The term “single ended” (denoting only one transistor) is used to distinguish it from the push-pull amplifier using two transistors. In case of a direct-coupled class A power amplifier shown, the quiescent current flows through the collector resistive load and causes large wastage of dc power in it. This dc power dissipated in the load resistor does not contribute to the useful ac output power. Furthermore, it is generally inadvisable to pass the dc through the output device such as in a voice coil…

A class A power amplifier is defined as a power amplifier in which output current flows for the full-cycle (360°) of the input signal. In other words, the transistor remains forward biased throughout the input cycle. A schematic circuit of a series fed class A large signal amplifier using resistive load Rc is shown below. The term “series fed” is derived from the fact that the load Rc is connected in series with the transistor output. The only difference between this circuit and the small-signal amplifier circuits considered previously is that the signals handled by the large-signal circuit are in…

General Introduction to Opto electronic devices Optoelectronics is the technology that combines optics and electronics and the devices based on this technology are known as optoelectronic devices. These devices can be catego­rized as light-generating optoelectric devices and light-sensitive devices.. So usually not the kind of thing you can pick up at your local supermarket or o2.co.uk outlet. You might have to try a hardware or electronics store in order to get what you need. Make sure you double check which wattage you require. The best known types of light-generating optoelectric devices are the ordinary tungsten filament lamp, the light-emitting diode…

An electronic galvanometer is a vacuum tube or transistor amplifier, followed by a milli ammeter may be employed as a detector. Some devices have arbitrary scale values, sometimes with variable gain and are designed simply as balance detectors. Sensitivity of such devices may be of the order of a microvolt per scale division or better, and the input  impedance is in the range of megaohms, so the current drawn from the measured source is usually negligible. Such instruments have the advantage of ruggedness,portability that permit their use under conditions that would be extremely difficult for a suspended galvanometer. Another possibility…

Whats is a resistance? The property of a substance, which oppses the flow of an electric current through it is called a resistance. Its is measured in ohms and is represented by letter ‘R’. Each resistor has two main characteristics. 1) Its resistance value in ohms and 2) its power dissipating capacity in watts Resistors are employed for many purposes such as electric heaters,telephone equipments, electric and electronic circuit elements and in current limiting devices. As resistors are used in wide applications there values like power rating,R value, tolerance etc vary. Resistors of resistance value ranging from .1ohms to many…

Here’s a descriptive video on How to perform Photo Etching on a PCB. This video also is based on “home PCB making techniques” – which helps electronic minds(electronics projects) to develop PCB’s from home. Such techniques are always interesting as an experiment & a means to save money!

Watch this amazing video on How to etch PCB using Ferric Chloride. You can do this in home in a simple way. Me too have done etching in home using Ferric Choride before & I am sure you will love this post.

Watch the video given below to get a better idea on how LED works?  A light emitting diode (LED) is known to be one of the best optoelectronic devices out of the lot. The device is capable of emitting a fairly narrow bandwidth of visible or invisible light when its internal diode junction attains a forward electric current or voltage. The visible lights that an LED emits are usually orange, red, yellow, or green. The invisible light includes the infrared light. The biggest advantage of this device is its high power to light conversion efficiency. That is, the efficiency is…

Op -Amp. An operational amplifier, often referred as an op-amp, is a very high gain performance amplifier designed to amplify ac and dc voltage voltages. Modern IC technology and large scale production techniques have brought down the prices of such amplify within reach of all amateurs, experimenters and hobbyists. The op-amp is now used as a basic gain element, like an elegant transistor, in electronic circuits. A symbol used to represent an op-amp in schematics is shown. The op-amp has two inputs and only one output. One input is called the inverting input and is denoted by a minus sign….

VOIP – Voice Over Internet Protocol VIOP (Voice over Internet Protocol) is a protocol used for the transmitting voice through the Internet or other packet switched networks. VoIP is often used to refer to the transmission of voice . VoIP is also known as , Internet telephony, , Broadband Phone. VOIP is pronounced as voyp. Companies providing VoIP service are commonly referred to as providers, and protocols which are used to carry voice over the network are commonly referred to as VoIP protocols. They may be viewed as commercial realizations of the experimental Network Voice Protocol implemented in 1973 for…