- In 1904, the vacuum tube diode was introduced, leading to the development of the triode amplifier in 1906 and the tetrode and pentode tubes in the early 1930s. The first transistor was demonstrated in 1947 at Bell Labs.
- Amplifiers must have at least three terminals, with one controlling the flow between the other two. They are used to amplify weak signals from transducers into a stronger form suitable for processing.
- Amplifier gain is defined as the ratio of output to input signal levels and can be expressed logarithmically in decibels. The linear operating range of amplifiers is limited by saturation levels.
A voltage amplifier circuit is a circuit that amplifies the input voltage to a higher voltage. So, for example, if we input 1V into the circuit, we can get 10V as output if we set the circuit for a gain of 10. Voltage amplifiers, many times, are built with op amp circuits.
Common emitter amplifier by YEASIN NEWAJYeasinNewaj
This slide has been created for students who are studying electrical engineering and who want to gain knowledge of basic electronics. The topic is COMMON EMITTER AMPLIFIER OF BJT
Negitive Feedback in Analog IC Design 02 April 2020 Javed G S, PhD
The webinar discusses the topics of negative feedback and its importance across the Analog IC design spectrum. In the talk, we discuss about the variations of feedback (Shunt and Series combinations) and their usage. It has applications in many control circuit design for power management, reference designs, regulator design, noise reduction in the system, gain desensitization and PLL design among many other systems.
And the end of the talk, the audience is expected to understand the need for the feedback and its applications
A Bipolar Junction Transistor is a three-terminal semiconductor device consisting of two p-n junctions which are able to amplify or magnify a signal. It is a current controlled device. The three terminals of the BJT are the base, the collector and the emitter. A BJT is a type of transistor that uses both electrons and holes as charge carriers
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus Visit : https://ekeeda.com/streamdetails/stream/Electrical-Engineering
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
A voltage amplifier circuit is a circuit that amplifies the input voltage to a higher voltage. So, for example, if we input 1V into the circuit, we can get 10V as output if we set the circuit for a gain of 10. Voltage amplifiers, many times, are built with op amp circuits.
Common emitter amplifier by YEASIN NEWAJYeasinNewaj
This slide has been created for students who are studying electrical engineering and who want to gain knowledge of basic electronics. The topic is COMMON EMITTER AMPLIFIER OF BJT
Negitive Feedback in Analog IC Design 02 April 2020 Javed G S, PhD
The webinar discusses the topics of negative feedback and its importance across the Analog IC design spectrum. In the talk, we discuss about the variations of feedback (Shunt and Series combinations) and their usage. It has applications in many control circuit design for power management, reference designs, regulator design, noise reduction in the system, gain desensitization and PLL design among many other systems.
And the end of the talk, the audience is expected to understand the need for the feedback and its applications
A Bipolar Junction Transistor is a three-terminal semiconductor device consisting of two p-n junctions which are able to amplify or magnify a signal. It is a current controlled device. The three terminals of the BJT are the base, the collector and the emitter. A BJT is a type of transistor that uses both electrons and holes as charge carriers
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Electrical Engineering is the Branch of Engineering. Electrical Engineering field requires an understanding of core areas including Thermal and Hydraulics Prime Movers, Analog Electronic Circuits, Network Analysis and Synthesis, DC Machines and Transformers, Digital Electronic Circuits, Fundamentals of Power Electronics, Control System Engineering, Engineering Electromagnetics, Microprocessor and Microcontroller. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus Visit : https://ekeeda.com/streamdetails/stream/Electrical-Engineering
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
2. • In 1904, the vacuum-tube diode was introduced by J. A. Fleming.
• Shortly thereafter, in 1906, Lee De Forest added a third element, called the control
grid, to the vacuum diode, resulting in the first amplifier, the triode.
• In the early 1930s the four-element tetrode and the five-element pentode gained
prominence in the electron-tube industry.
• On December 23, 1947, Dr. S. William Shockley, Walter H. Brattain, and John
Bardeen demonstrated the amplifying action of the first transistor at the Bell
Telephone Laboratories.
• All amplifiers (devices that increase the voltage, current, or power level) have at least
three terminals, with one controlling the flow or potential between the other two.
3. • This signal processing is usually most conveniently performed by electronic systems.
• For this to be possible, however, the signal must first be converted into an electric
signal, that is, a voltage or a current.
• This process is accomplished by devices known as transducers.
• The simplest signal-processing task is that of signal amplification.
• The need for amplification arises because transducers provide signals that are said to
be "weak," that is, in the microvolt (μV) or millivolt (mV) range and possessing little
energy.
• Such signals are too small for reliable processing, and processing is much easier if
the signal magnitude is made larger.
• The functional block that accomplishes this task is the signal amplifier.
4. • The signal amplifier is obviously a two-port network. Its function is conveniently represented by the
circuit symbol of Fig. 1(a).
• A more common situation is illustrated in Fig. 1(b), where a common terminal exists between the input
and output ports of the amplifier. This common terminal is used as a reference point and is called the
circuit ground.
• An amplifier contains one or more active devices and transforms power from the dc supply into the
signal pwer at the output, the signal amplitude at the output being proportional to that at the input.
5.
6. • In the case of a transformer, although the voltage delivered to the load could be greater than the
voltage feeding the input side (the primary), the power delivered to the load (from the secondary side
of the transformer) is less than or at most equal to the power supplied by the signal source.
• On the other hand, an amplifier provides the load with power greater than that obtained from the
signal source. That is, amplifiers have power gain.
• The power gain of the amplifier is defined as:
where ia is the current that the amplifier delivers to the load (RL)' ia = 'oa/RLo and iI is the current the
amplifier draws from the signal source.
• The current gain of the amplifier is defined as:
• Thus,
7. • The amplifier gains are ratios of similarly dimensioned quantities.
• Alternatively: electronics engineers express amplifier gain with a logarithmic measure.
• Specifically the voltage gain Av can be expressed as:
8.
9. • Practically speaking, the amplifier transfer characteristic remains linear over only a limited
range of input and output voltages.
• For an amplifier operated from two power supplies the output voltage cannot exceed a
specified positive limit and cannot decrease below a specified negative limit.
• Each of the two saturation levels is usually within a volt or so of the voltage of the
corresponding power supply.
• With the positive saturation levels denoted L+ and L-, respectively, obviously, in order to
avoid distorting the output signal waveform, the input signal swing must be kept within the
linear range of operation,
10.
11.
12.
13. 6. As based on magnitude-response curve (or coupling)
(a) capacitively coupled amplifier (b) direct-coupled amplifier
(c) tuned or bandpass amplifier.
14. • In small-signal amplifiers, the main factors are usually amplification linearity and
magnitude of gain.
• Since signal voltage and current are small in a small-signal amplifier, the amount of
power-handling capacity and power efficiency are of little concern.
• Large-signal or power amplifiers, on the other hand, primarily provide sufficient
power to an output load to drive a speaker or other power device, typically a few
watts to tens of watts.
• The main features of a large-signal amplifier are the circuit’s power efficiency, the
maximum amount of power that the circuit is capable of handling, and the impedance
matching to the output device.
15.
16.
17.
18.
19.
20.
21.
22.
23. • In capacitively coupled amplifier [Fig. (a)] the gain remains constant over a wide frequency range but
falls off at low and high frequencies. This is a common type of frequency response found in audio
amplifiers.
• Internal capacitances in this type of amplifier (a transistor) cause the falloff of gain at high
frequencies. On the other hand, the falloff of gain at low frequencies is usually caused by coupling
capacitors used to connect one amplifier stage to another. Coupling capacitors will thus cause loss of
gain at low frequencies and cause the gain to be zero at dc.
Frequency response for (a) a capacitively coupled amplifier
24. • There are many applications in which it is important that the amplifier maintain its gain at low
frequencies down to dc. Furthermore, monolithic integrated-circuit (IC) technology does not
allow the fabrication of large coupling capacitors. Thus IC amplifiers are usually designed as
directly coupled or dc amplifiers (as opposed to capacitively coupled or ac amplifiers). Figure
(b) shows the frequency response of a dc amplifier. Such a frequency response
characterizes what is referred to as a low-pass amplifier.
Frequency response for (b) a direct-coupled amplifier
25. • In a number of applications, such as in the design of radio and TV receivers, the need
arises for an amplifier whose frequency response peaks around a certain frequency (called
the center frequency) and falls off on both sides of this frequency, as shown in Fig. (c).
Amplifiers with such a response are called tuned amplifiers, bandpass amplifiers, or
bandpass filters. A tuned amplifier forms the heart of the front-end or tuner of a
communication receiver; by adjusting its center frequency to coincide with the frequency of
a desired communications channel (e.g., a radio station), the signal of this particular
channel can be received while those of other channels are attenuated or filtered out.
Frequency response for (c) a tuned or bandpass amplifier.
26.
27.
28.
29.
30. • A pure sinusoidal signal has a single frequency at which the voltage varies
positive and negative by equal amounts. Any signal varying over less than
the full 360°cycle is considered to have distortion.
• An ideal amplifier is capable of amplifying a pure sinusoidal signal to provide
a larger version, the resulting waveform being a pure single-frequency
sinusoidal signal.
• When distortion occurs, the output will not be an exact duplicate (except for
magnitude) of the input signal.
• Distortion can occur because the device characteristic is not linear, in which
case non-linear or amplitude distortion occurs. This can occur with all classes
of amplifier operation.
• Distortion can also occur because the circuit elements and devices respond
to the input signal differently at various frequencies, this being frequency
distortion.
31.
32.
33.
34.
35.
36.
37. • The simple fixed-bias circuit connection shown in Fig. 2 can be used to discuss the main features of a
class A series-fed amplifier.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56. • A number of circuit arrangements for obtaining class B operation are possible.
• The input signals to the amplifier could be a single signal, the circuit then
providing two different output stages, each operating for one-half the cycle.
• If the input is in the form of two opposite-polarity signals, two similar stages could
be used, each operating on the alternate cycle because of the input signal.
• One means of obtaining polarity or phase inversion is using a transformer, and the
transformer-coupled amplifier has been very popular for a long time.
• Opposite-polarity inputs can easily be obtained using an op-amp having two
opposite outputs or using a few op-amp stages to obtain two opposite-polarity
signals.
• An opposite-polarity operation can also be achieved using a single input and
complementary transistors (npn and pnp, or nMOS and pMOS).
57. • Fig. (a) shows a center-tapped transformer to provide opposite-phase signals.
• If the transformer is exactly center-tapped, the two signals are exactly opposite in
phase and of the same magnitude.
58. • The circuit of Fig. b uses a BJT stage with in-phase output from the emitter and
opposite-phase output from the collector.
• If the gain is made nearly 1 for each output, the same magnitude results.
59. • Probably most common would be using op-amp stages, one to provide an inverting
gain of unity and the other a noninverting gain of unity, to provide two outputs of the
same magnitude but of opposite phase.
60. • Using complementary transistors (npn and pnp) it is possible to obtain a full cycle output across a load
using half-cycles of operation from each transistor, as shown in Fig. a.
• Whereas a single input signal is applied to the base of both transistors, the transistors, being of
opposite type, will conduct on opposite half-cycles of the input.
• The npn transistor will be biased into conduction by the positive half-cycle of signal, with a resulting
half-cycle of signal across the load as shown in Fig. b. During the negative half-cycle of signal, the
pnp transistor is biased into conduction when the input goes negative, as shown in Fig. c.