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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

Why power amplifier are called as large signal amplifiers?

in general the CE amplifiers are called low-signal amplifiers as they use only small values of voltage as a source of input which cant be used in practical purposes, whereas power amplifiers deal with practical values of input and output voltages

What is the symbol for a transistor?

There are many types of transistors, starting out with the typical Base-Collector-Emmitter type. There are two types, starting with the NPN type, The symbol for these is PNP There are also the FET or Field Effect Transistors and their symbols are below, as well as the PNP and NPN. The FET's are divided into the N channel and J channel types:

When you do modulation in time domain you get modulated waveform of modulating signal information and carrier. How can you recognize the upper and lower side bands in time domain modulated waveform?

You need modulation signal(carrier) which is a required signal in order to make envelope of time domained signal(target signal). The modulating signal is imposed on modulation signal.This creates envelope of waveform which is modulated(desired) signal. Now, the desired signals uper and lower sideband of signal strictly depends on modulation signal's bandwidth. Max. peak of that signal is uper sideband and min. peak is lower sideband for this modulated signal.

What cause transistor collector current to increase when its warming up?

The forward current of any semiconductor device is dependent on temperature. This can cause collector current to increase in an uncompensated circuit. In the worst case, this can cause thermal runaway, and failure of the device. Often, we compensate for temperature by placing biasing limits on the demand for the transistor's gain.

What is the operating temperature for TTL?

The operating temperature for standard commerdcial TTL (74 series) 0 to 70 degrees Celsius. Military grade between -40 and 125 degrees. Some commercial 74 series used for industrial and automotice applications between -15 and 85 degrees C. In the real world standard commercial TTL often works quite happily under mil spec conditions. I know because I have tried it!

What are the three types of computers?

There are lots of types of computers:

  • analog computers
  • digital computers
  • hybrid computers
  • Mainframe
  • Mini
  • Micro
  • System on a chip
  • Business
  • Scientific
  • General purpose
  • Supercomputer
  • Embedded

Fabrication of monolithic IC?

this process involves following major steps... 1. Wafer preparation 2. Epitaxial growth 3. Oxidisation 4. Photolithographic process 5. Isolation diffusion 6. Base and emitter diffusion 7. Pre-ohmic etch 8. Metallisation 9. circuit probing 10. Scribing and separating into chips 11. Mounting and packing 12. Encapsulation (NOTE;- These are the processes involved for monolithic ic's. Detailed information can be found on internet.)

What should you do if your AC was working fine until there was a power outage and once power was restored the AC will not come on and you think maybe it is out of cycle?

There are numerous posibilities that may have occured. When you say A/c, Is this a split system, as in a indoor and outdoor unit. or a package unit or maybee a window unit? The simpilist answer is to reset the circuit breakers even if the do not appear to be tripped. Also the brand(s) would be helpful.

What is x sub l?

X sub l is called Inductive Reactance, the opposition to the changing current.

What are the objectives in laboratory safety?

The objectives of laboratory safety are to prevent lab occupants or passers by from being made ill or hurt by the chemicals or an explosion, and to prevent damage to the lab, lab building, and lab equipment.

Why electrical current arc through the ceramic insulator?

There may be a crack in the ceramic. Also, all insulating materials have a dielectric breakdown voltage, often expressed in volts per mil (0.001 inch). For example barium titanate ceramic breaks down at 75 volts per mil. Thus a 0.5 inch thick insulator of barium titanate ceramic will withstand up to 37,500 volts.

What is emotional resonance?

Emotional resonance is some form of agreement or sympathy, between the emotions that someone else is expressing, and your own. You can feel what they feel, if only as an echo. Your heart strings have been plucked.

Why does a lcd tv give off so much heat?

A: There are million of small devices involved each dissipating a small heat but the accumulation is in the millions so there is heat to dissipate

Can a capacitor be hooked to a DC circuit?

Yes, capacitors can be, and often are, used in DC circuits. At steady state DC conditions, the capacitor has near infinite impedance. Its value is in its ability to resist changes in voltage, so it can serve as a transient filter. There is almost always a small ceramic capacitor connected between VCC and ground next to IC's in a digital circuit, for that exact purpose.

What causes 12v dc motor to to drop variably to 2v to 7v under load?

Too much load, or too weak of a supply. When a motor is initially started, it will pull a higher than normal amount of current. A sag may occur if the supply is too small, and then it should rebound after a short period of time. If the voltage stays low, either the supply is well undersized, or the motor is pulling more current than it should (either the load is too heavy for the motor or the motor is damaged or dirty).

Where is the PUK code located on your phone?

it is a security setting just like locking and unlocking the mobile