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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
Is there anyway to build a blue laser driver circuit WITHOUT using a LM317 Chip?
No. you need that regulator to accuratly measure the current or you will destroy the laser diode . Blue laser Diodes will Blow on regular 3 volt batteries because a regular battery (aaa) supplies way more current to the diodes than it needs thus burning it out .Most AA batteries can produce 1 amp or more . (Poof)
The correct formula to determine how many Amps of current a device will draw is?
There is no formula it depends on the device. If the device is linear it can be ascertain but if it a non linear then it becomes quite complex
Why a motor starts in star and runs in delta?
This configuration is used to reduce the starting current. Utility companies do not like large motor loads starting across the line. It dips the voltage level of the line. By reducing the starting current to a lower level also reduces the voltage dip in the supply lines.
How do you make a led simple circut?
It is simple LEDS do need a definite voltage drop to work must have a minimum current to operate. for a 9v battery source and a LED of 3.2v operating at 20ma the solution will be 9v-3.2=5.8v therefore to limit the current to 20ma a resistor of 5.8v/0.02=290 ohms not such an animal so a 270-300 ohms will work. Final note make sure that the LED power is not exceeded 3.2v x0.02ma=63 mw
In electronics it simply means a way to control either voltage and/or current there are mechanical regulators not related to electronics
How does a signal generator work?
For ac usually is a non linear resistance that can be used to change frequency Or a relaxation oscillator can supply square waves and filter it to get the basic frequency.. piratically all of them needs some kind of positive feedback
What are the different types of noise in communication systems?
There are a number of ways to classify noise. It can be subdivided according to type, source, effect, or relation to the receiver, depending on circumstances. In order to make the classification more compact, noise sources can be divided into two main groups: • Noise whose sources are external to the receiver (External Noise) and • Noise source created within the receiver itself (Internal Noise). types include: Shot noise; Johnson noise and Partition noise.
In electrical terms, noise is defined as the unwanted form of energy which tends to interface with the proper reception and the reproduction of transmitted signals. Electronic Devices unwanted random addition to the signal are considered as Noise.
Classification of Noise:There are several way to classify Noise, but conveniently Noise is classified as
1) External Noise
2) Internal Noise
External Noise:
External noise is defined as the type of Noise which is general externally due to communicationsystem. External Noise are analysed qualitatively. Now, External Noise may be classified as
a) Atmospheric Noise : Atmospheric Noise is also known as static noise which is the natural source of disturbance caused by lightning, discharge in thunderstorm and the natural disturbances occurring in the nature.
b) Industrial Noise : Sources of Industrial noise are auto-mobiles, aircraft, ignition of electric motors and switching gear. The main cause of Industrial noise is High voltage wires. These noises is generally produced by the discharge present in the operations.
c) Extraterrestrial Noise : Extraterrestrial Noise exist on the basis of their originating source. They are subdivided into
i) Solar Noise
ii) Cosmic Noise
Internal Noise:
Internal Noise are the type of Noise which are generated internally or within the Communication System or in the receiver. They may be treated qualitatively and can also be reduced or minimized by the proper designing of the system. Internal Noises are classified as
1) Shot Noise : These Noise are generally arises in the active devices due to the random behaviour of Charge particles or carries. In case of electron tube, shot Noise is produces due to the random emission of electron form cathodes.
2) Partition Noise : When a circuit is to divide in between two or more paths then the noise generated is known as Partition noise. The reason for the generation is random fluctuation in the division.
3) Low- Frequency Noise : They are also known as FLICKER NOISE. These type of noise are generally observed at a frequency range below few kHz. Power spectral density of these noise increases with the decrease in frequency. That why the name is given Low- Frequency Noise.
4) High- Frequency Noise : These noises are also known TRANSIT- TIME Noise. They are observed in the semi-conductor devices when the transit time of a charge carrier while crossing a junction is compared with the time period of that signal.
5) Thermal Noise : Thermal Noise are random and often referred as White Noise or Johnson Noise. Thermal noise are generally observed in the resistor or the sensitive resistive components of a complex impedance due to the random and rapid movement of molecules or atoms or electrons.
Get more details from http://blog.oureducation.in/types-of-noise/
What is the applications of sawtooth generator?
The main application of a sawtooth generator in consumer electronics has been in CRT displays.
To control the scanning of the electron beam, you need precise ramp input to the deflector coils, but you need to bring back the electron beam to the left side (top) of the display quickly to maximize brightness; hence, two sawtooth generators for the vertical and horizontal scanning.
Of course, this is less common than it once was, since the advent of LCD and plasma displays.
How frequency affect the performance of a transformer?
Transformers are designed for a specific application. frequency IS A MAJOR FACTOR THAT GOES INTO THE DESIGN.
Is Magnitudes of two waves are same but phase difference is zero?
AC if the signal is of the same amplitude but out of phase yes the net product Vs time will be zero.
Deacribe a method for frequency translation?
let me explain it : The transfer of signals occupying a specified frequency band, such as a channel or group of channels, from one portion of the frequency spectrum to another, in such a way that the arithmetic frequency difference of signals within the band is unaltered. One key operation is the frequency translation of a signal spectrum from one center frequency to another. Conversions between baseband and bandpass representations (modulation and demodulation) are special cases of this. Conceptually, the most simple case is the (complex) I/Q-mixing. Here the input sequence is multiplied by a complex exponential signal corresponding to the local oscillator (LO) frequency fLO.
(2.1)
It follows directly from the properties of Fourier transform that I/Q mixing causes a pure frequency translation of the signal spectrum:
(2.2)
Complex mixing used to produce pure frequency translation of input spectrum.
1:1
Why are wind turbines not placed next to one another?
The wind farmers usually want to spread them out so the propellers do not collide. They also want to spread the turbines out so that they can catch the wind wherever it is.
a 2 bit counter is a counter which have only 2 bits i.e. the posibble counting states are 00, 01, 10,11,00. It may also be known as MOD 3 counter. It can be realized by using 2 Flip flop.
What are the types in waveguides?
3 types:
1.electromagentic waveguides
2.optical waveguides
3.acoustic waveguides
What are the Difference between dc motor and dc generator?
a motor Will do work by consuming power a generator is just the opposite
well if you doubled the coils it would be pie times the amount of voltage in the current squared
yes yesyes you can i just dont know how yet but i know people that have!!!
What is the Difference between electronic and digital switching?
A chopper to chop DC into AC is an electronic switching. Digital is data bits or machine language whereby a processor can make decisions
