In class AB power amplifiers, the biasing circuit is so adjusted that the operating point Q lies near the cut-off voltage. During a small portion of negative half cycle and for complete positive half cycle of the signal, the input circuit remains forward biased–and hence collector current flows. But during a small portion (less […]
Harmonic distortion in power amplifiers. Distortion is a serious problem faced in power amplifier design. In faithful amplification the output signal must be a scaled replica of the input signal and if there is any dissimilarity between the input and output waveform, then the output is said to be distorted. Unpleasant sound output coming from
Class B power amplifier. Class B amplifier is a type of power amplifier where the active device (transistor) conducts only for one half cycle of the input signal. That means the conduction angle is 180° for a Class B amplifier. Since the active device is switched off for half the input cycle, the active device
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
Class A power amplifier. Class A power amplifier is a type of power amplifier where the output transistor is ON full time and the output current flows for the entire cycle of the input wave form. Class A power amplifier is the simplest of all power amplifier configurations. They have high fidelity and are totally
Introduction Optoelectronics is the branch of electronics that combines optics and electronics. The devices that deal with this technology is called optoelectronics devices. Optoeletronic devices can be divided into two – light sensitive devices and light generating devices. We have already discussed a good amount of optoelectronic devices in our site. You can get the
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,
 Note:- This article is currently under editing. You may refer this article later to get the full version In this article, we are going deep into resistors and different types of resistors. A resistor is one component that we use in every electronic circuit. Whats is resistance? “Resistance” by definition is the opposition to free
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? Â 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
We have already discussed in detail about the basics on operational amplifier, its block diagram, symbol, different characteristics, and its circuit diagram (Refer:- Op Amps-Operational Amplifiers). In this post, we will be discussing about the 741 IC, one of the most popularly used op-amp IC. About the uA741 Op-amp IC The 741 IC was designed
VOIP (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
