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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

What is near-far effect?

Adjacent channel interference nearby frequency leak into passband. The problem can be worse if an adjacent channel user is transmitting in very close range to a subscriber receiver. This problem is referred as near far affect. By Kazi Ashique Ahmed Rafi

it usaully occurs in CDMA when users are transmitting unequal powers.

by salman ahmed

Why does the resistance in a series resonant circuit have no bearing on the resonant frequency?

Series resonance occurs when a circuit's inductive reactance is equal to its capacitive reactance. The resistance of the circuit is irrelevant.WebRep

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What is the use of connections?

Computer connections are important because they allow the user of a computer to access other electronic devices such as your printer, Xbox360 console or television set.

What is the equivalent component to use in the place of IC 555?

Only a 555 can replace a 555, there is no equivalent. 555s are made by many companies, each with their own prefixes and suffixes, but all are 555s.

What is the Tri State of a Signal?

Tri-State: typically the 3rd state of a digital signal, floating (neither driven to a logic 1 or a logic 0).

Normally a high current flows through a short circuit even if there is no change to the voltage. Why is this?

A high current flows through a short circuit even if there is no voltage change because the resistance across the short circuit is zero.

Is air a semiconductor?

No, air is not a semiconductor; it is generally considered an insulator. Semiconductors are materials that have electrical conductivity between that of conductors and insulators, typically characterized by their ability to conduct electricity under certain conditions. Air does not exhibit the necessary properties to be classified as a semiconductor, as it does not have a significant number of charge carriers available for conduction.

How clock works in flip flop?

In a flip-flop circuit, the clock signal serves as a timing reference that controls when the flip-flop changes its output state. The flip-flop typically samples its input data on the rising or falling edge of the clock signal, meaning it only updates its output based on the input state at that precise moment. This synchronization ensures that changes in state only occur at specific times, allowing for reliable data storage and transfer in digital circuits. By using clock edges, flip-flops can be integrated into sequential logic circuits, enabling the design of more complex systems like registers and counters.

How are frequency and amplitude related?

They're not. The same amplitude can have high or low frequency,

and the same frequency can have large or small amplitude.

What is an audio inverter?

it invert the polarity of the in/out of the device. Inverter by definition invert one form to another form of energy [minus loss] so it can be used.

How you can choose the capacitor range for 24 volt output rectifier?

the high quality way is to rate the capacitor for:

2 times the DC voltage.

or

2 times the peak voltage of the transformer.

Consumer Industry does not care about prpoduct life span and accepts much less conservative "bare minimum" ratings to reduce cost:

1.5 times the DC voltage.

or

10% higher than the peak voltage of the transformer

A good 24V supply has a 35V capacitor.

Of course the cheaply made product will fail sometime with such narrow margin.

How do you interface external hardware through PC serial port?

Just use any of the compter language, say C,C++ make a program or rather i should say a software and then connect the hardware to the printer port and then execute the program to operate the hardware.

For example make a simple program to glow an LED through the pc, you can even use a micro-processor for the same...

Explain advantages and applications of switching regulators?

Switching regulator is a so simple switch in which the switch goes on and off at a fixed rate usually between 50Khz to 100Khz as set by the circuit. The main advantage of switching regulators is its high power conversion efficiency and increased design flexibility when it comes to multiple output voltages of different polarities can be generated from a single input voltage.

The characteristics curve of the component?

This is probably the I-V characteristic: Apply a voltage to one terminal of the component, the current through the component is then recorded; this is done for varying values, and is plotted out on a graph. For transistors, this shows where the "linear operation" region is; for diodes, this shows the "turn on" voltage. Such characteristics will be in the data sheets for whatever component you're using.

Which devices have characteristics very close to that of an ideal current source?

Most sources attempt to provide a specific voltage by design. An ideal current source does not do this, and thus there are not very many good examples. A current transformer, like what is used for relaying and metering in the power system, is an ideal current source - it provides a direct reflection of the amount of current flowing in the primary side to th secondary side, regardless of voltage in the secondary (up to saturation of the transformer).

A transistor amplifier may be set up as a current source as well. As in the above example, if the output resistance becomes too large, saturation of the transistor will occur causing it's characteristic output to be nonlinear.

A battery is an ideal voltage source in series with a variable resistance (the internal resistance of the battery). A charged capacitor can be thought of the same, without the internal resistance (since this is extremely small compared to the capacitance, it can be ignored in many cases).

A generator could be considered either a constant current source or voltage source, depending on how it is run. In some instances, a constant current will cause output voltage to increase or decrease. This variance can be controlled (to an extent) with external devices (capacitor and inductor banks, switching in and out specific lines, etc.). A generator can also be set up to provide a specific output voltage.

Is current is drop when it flowing through the resistor?

Current flows in loops, voltage drops across elements. With relation to current, what flows in, must flow out, so no, current is not dropped across a resistor, it flows through a resistor and voltage is dropped across the resistor.