0
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
What is the importance of De-emphasis network in FM receiver?
One characteristic of the FM process is that the noise is distributed such that it's lowest at the bottom frequency of the channel, and increases steadily as you move up the channel. Knowing this, pre- and de-emphasis is the clever trick we use to decrease the noise in the FM communications channel. Here's how it's done:
At the transmitter, pre-emphasis is applied to the baseband information before modulation ... the main channel L+R and L-R signals, plus any subcarriers that the station carries. Pre-emphasis is intentional distortion of the frequency response across the baseband that attenuates the low-frequency end, and progressively amplifies everything as you move up in frequency. The result of this operation is what actually gets transmitted.
The receiver is responsible for doing just the opposite. It applies de-emphasis immediately after demodulation ... it attenuates the high-frequency end of the baseband, and progressively amplifies everything as you move down in frequency.
If the pre- and de- are accurately matched, then the frequency response of the system winds up flat across the baseband, which is what we want. But ... by attenuating the higher frequencies, the receiver also changes the noise-content of the baseband, from a distribution that gets worse as you move up in frequency, to a distribution that's flat across the channel.
Change as time from low to high voltage and opposite
SIP means 'single in-line package', so it is a pack of several resistors, often with one end common.
How is Half wave rectifier experiment?
halfwave rectifier converts ac to pulsating dc.in half wave rectifier we use only one diode.during forward bias condition the circuit is open and hence conducts hence we get +ve half cycles where in reverse bias condition the circuit is open and hence doesn't conducts.
How a electric razor scooter works?
it should work has soon as u turn it on using the key... and u usually twist back the right or left handle back toward you to get it to work... _kristin_ <hope that helped you!!!!>
What is frequency domain counterpart of convolution?
Convolution in the time domain is equivalent to multiplication in the frequency domain.
The same as what? when an inductor is connected in series with a resistor and a current passed through them, the voltages across the resistor and inductor are equal when the reactance is equal to the resistance:
2.pi.f.L = R
What is the voltage across a 1k ohm resistor when it dissipates 0.625w?
dude... using the relation power is the ratio of square of voltage to the resistance
P=V^2/R
on substitutiing ,
we get v=(0.000625)^1/2
= 0.125 V
When current in primary coil decreases current in the secondary coil also decreases?
It is reverse. when load current in the secondary changes the primary current also changes directly. Load current is dependent on the load.
I am assuming that the question is related to a normal distribution transformer.
What is safety guard for blind using 555 timer?
A safety guard for the blind using a 555 timer typically involves creating a device that can detect obstacles and provide audio or tactile feedback. The 555 timer can be configured in a monostable or astable mode to control sensors, such as ultrasonic or infrared, which measure distances to nearby objects. When an object is detected within a certain range, the timer triggers an alert mechanism, such as a buzzer or vibration motor, to warn the user. This setup enhances mobility and safety for visually impaired individuals by providing real-time alerts about their surroundings.
Who collector base current when emitter is off?
When the emitter of a bipolar junction transistor (BJT) is off, the collector-base junction is typically reverse-biased, meaning that the collector current is minimal or negligible. In this state, the collector-base junction does not conduct significant current because the emitter does not provide carriers to the base. As a result, the collector current is effectively zero, and the transistor is in its cutoff region.
What is the difference between transfer function and frequency transfer function?
frequency transfer function deals with transfer in frequency domain, transfer function alone can be referring to any type of transfer in different domain e.g time domain
Can a 5v battery charger be used to charge a 3.7 v battery?
Last night I took my zen vision w which has a 3.7v battery and i tried to charge it with a 5v usb wall charger. At first it was charging normally, my zen even turned on, when I came home from walking the dogs my zens screen was black and the blue light just flashed five times every time i tried to turn it on. So I guess the answer is no, i guess i blew a cuircuit. I feel horrible...
What is the explanation for the types of Switching systems?
There are three type of switching system such as circuit switching ,packet switching , massage switching.
