Input and Output Impedances of Amplifiers
https://www.electronics-lab.com/article/input-and-output-impedances-of-amplifiers/
Introduction In a very simplified point of view, an amplifier consists of a “box” that realizes an amplification function between an input signal and an output signal. The way that the input enters the system and the output leaves it is very important and affects the general behavior of an amplifier. In more technical terms, […]
Class C Amplifiers
https://www.electronics-lab.com/article/class-c-amplifiers/
Introduction Despite their differences, we have seen in the previous tutorials about class A, class B and class AB amplifiers, that these three classes are linear or partially linear since they reproduce the shape of the signal during the amplification process. This is due to the fact that they use at least 50 % of […]
Class AB Amplifiers
https://www.electronics-lab.com/article/class-ab-amplifiers/
Introduction Class A amplifiers offer a very good linearity of the output, meaning that the signal is faithfully reproduced, however their efficiency is very low, around 20-30 % in most of the cases. On the other hand, class B amplifiers present a very high efficiency up to 78.5 % but cannot reproduce the output faithfully. […]
Class B Amplifiers
https://www.electronics-lab.com/article/class-b-amplifier/
Introduction We have seen during the previous tutorial that Class A amplifiers are characterized by a conduction angle of 360° and a theoretical maximum efficiency of 50 %. In this new tutorial, we will present in detail another class of amplifiers known as Class B that have been developed as an answer to the low […]
Amplifier Classes
https://www.electronics-lab.com/article/amplifier-classes/
Introduction Amplifiers are commonly classified depending on the structure of the output stage. Indeed, the power amplification really happens during that stage and therefore the quality and efficiency of the output signal is dictated by the architecture of the amplifier’s output. The classification consists of an alphabetical arrangement A, B, AB and C that relates […]
Common Emitter Amplifier
https://www.electronics-lab.com/article/common-emitter-amplifier/
Presenting the Common Emitter Amplifier In the next three tutorials, including this one, we will present the three elementary topologies of bipolar transistors based amplifiers : the Common Emitter Amplifier, the Common Collector Amplifier and finally, the Common Base Amplifier. We begin this series of tutorial by dealing with the most common type of amplifier […]
Common Base Amplifier
https://www.electronics-lab.com/article/common-base-amplifier/
Presenting the Common Base Amplifier In this article, we present the last topology of amplifiers for bipolar transistors known as the Common Base Amplifier (CBA). In Figure 1 below, the electric diagram of a CBA is presented, no particular bias circuit or decoupling capacitors are shown here. Some specifications need to be highlighted for CBAs […]
Common Collector Amplifier
https://www.electronics-lab.com/article/common-collector-amplifier/
Presenting the Common Collector Amplifier This article deals with another type of bipolar transistor architecture used to amplify signals that is commonly known as Common Collector Amplifier (CCA). The CCA can also sometimes be called emitter-follower amplifier and we will understand why later in this article. The first figure below is a simplified electric diagram […]
6CY7 dual triode valve amplifier
https://www.electronics-lab.com/6cy7-dual-triode-valve-amplifier/
Josh built this 6CY7 dual triode valve amplifier: I’ve always wanted to know what the “tube magic” was all about. There is much opinion in the science of music production, probably because music and its perception is highly personal and subjective. Ive always imagined that since transistor amplifiers were “perfect” with their large amounts of […]
Low Cost/Voltage 3W Class-D Stereo Audio Amplifier for Portable Gadgets
https://www.electronics-lab.com/low-cost-voltage-3w-class-d-stereo-audio-amplifier-portable-gadgets/
This low cost low voltage 3W class-D stereo amplifier is based on PAM8403 IC, The PAM8403 is a 3W, class-D audio amplifier. It offers low THD+N, allowing it to achieve high-quality sound reproduction. The new filter-less architecture allows the device to drive the speaker directly, requiring no low-pass output filters, thus saving system cost and […]