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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

Difference between amplifier and feedback amplifier?

An ordinary amplifier can have high gain but is unstable, drifts, can oscillate, etc.

An amplifier with negative feedback has lower gain but is stable, does not drift, won't oscillate, etc.

If you are mixing local oscillator freq with adc frequency in FM radio then what is the freq of mixer chosen?

The most common IF in consumer FM radios is 10.7 MHz.

So, for the FM broadcast band of 88 - 108 MHz, the local oscillator frequency would be

between 98.7 MHz and 118.7 MHz.

It could just as well have been chosen to work on the low side of the RF. But that would have

placed the LO between 77.3 MHz and 97.3 MHz. Any LO leakage from the radio could have

played havoc with TVs in the house tuned to the old analog Channel 5 (76 - 82 MHz) or

Channel 6 (82 - 88 MHz).

How is the left-hand rule related to current and magnetic field?

It is related to the flow of electrons in a conductor through aseparate magnetic field. If you point your index finger straight place your thumb up and place your middle finger at a 90 degree angle to the other two (unless you are really double jointed there is only one way to do it.). The direction of current and your wire is the middle finger the direction of magnetic plane pointing north is your index finger and the direction of force is your thumb.

There is also the right hand rule. If you look at your right hand with your thumb up and fingers curved, If you held a piece of wire in your hand with the current traveling along the direction of your thumb the magnetic field would rotate in the direction of your fingers.

What happens to the steel cylinder on the circuit breaker if a large current flows through the coil?

I take it you mean the iron (rather than steel) core of the solenoid. If the current reaches the limit set, it is attracted against a spring by the resulting magnetic field created by the coil around it. The movement trips the switch that cuts the current, and usually stays mechanically latched off until re-set by a local or remote control.

(Some circuit-breakers, called auto-reclosers, re-set themselves once the overload has passed. These are typically used on grid transmission-lines.)

Was inventing the radar a mistake?

The invention of radar was not by accident or a mistake but it was not originally designed to detect objects etc... as it does today. Radar (for Radio Detection And Ranging) was developed over the years with input from many sources, but it was Robert Watson-Watt, a Scottish physicist looking for a reliable method to help airmen locate and avoid approaching thunderstorms, who designed the first set put into practical use. Watson-Watt realized, as he perfected his device, that radio waves could be used to detect more than storms and so was then put into practical use around the time of the Battle of Britain where it was an invaluable tool to allow the men on the ground to detect an enemy plane coming in and allow time to defeat it.

What is the purpose of a diode in a cordless drill or power screwdriver?

it controls the speed. when the diode is busted it gains into fullspeed

What is the function of pneumatics?

A: physics tells us that if a put 1lb of pressure here it will be 1 lb far away.

B: The function of pneumatics is to affect mechanical action by means of compressed gasses.

How to Wire two channel amplifier to give surround sound?

Short answer: not possible, sorry.

Long answer: the only way to get surround sound is to use multiple outputs and multiple amplification points, and then drive multiple speakers.

You can 'fake' some effects, though. For example, partially selecting bands from Left and Right can form a Center. Spatializing between Center and Right will make a Front-Right, and so on. But this is NOT true surround sound. This is a way to 'surround yourself with sound', yes, but it has nothing to do with more than two channels of audio.

Do field lines around a current wire look different from those around a bar magnet?

Yes. The field lines of a bar magnet emerge from one end, curve around, and stop at the other end.

The field lines around a current-carrying wire are circles, with the wire passing through their centers.

What advantage does a statistical multiplexer have over a TDM multiplexer or an FDM multiplexer?

Statistical multiplexer does not reserve time slots or frequencies. Instead, it dynamically allocates bandwidth only when it is needed.

Why a sine wave is a simple vertical line in a frequency domain?

A sine wave is a simple vertical line in the frequency domain because the horizontal axis of the frequency domain is frequency, and there is only one frequency, i.e. no harmonics, in a pure sine wave.

What is the principle of radar?

The basic idea behind radar is very simple: a signal is transmitted, it bounces off an object and it is later received by some type of receiver. This is like the type of thing that happens when sound echo's off a wall. However radars don't use sound as a signal. Instead they use certain kinds of electromagnetic waves called radio waves and microwaves. This is where the name RADAR comes from (Radio Detection And Ranging). Sound is used as a signal to detect objects in devices called SONAR (Sound Navigation Ranging).

What is 47 kilo ohms in mega ohms?

The answer is .047Megohms.

1kilo ohm is 1,000 ohms.

1mega ohm is 1,000,000 ohms.

Just move the decimal over to convert.

How do you match speakers with amplifiers watts ohms max power ect?

You always want to buy speakers rated higher than the max RMS output of the amp. I've blown plenty of speakers in my day as soon as I turned it on.

Ohms is just as important. Never connect two or more speakers in parallel. This cuts the ohms to less than half and you will blow the amp if its not designed for it . You can connect speakers in series if you like but this cuts your RMS output to less than half and also could blow the amp. One speaker per channel and keep the gain nob one level below max to be safe.

Car amps 4 ohms speakers.

House amps 8 ohms unless specified.

That answer (above) is not much help, nor true. (I wouldn't trust someone who has blown "plenty of speakers", it sounds like a poke and hope job.) Unfortunately, the correct answer is hard to obtain because the people who sell amplifiers and speakers don't always use the RMS power rating for CONTINUOUS power when describing the components. These manufacturers know that we folks are into POWER and they usually advertise the components "PEAK" power rating. WOO HOO!

But bottom line, it's easier to blow the amp with higher rated speakers because the the amp is working too hard to fill that big jug so to speak. The rule is to get an amp with about twiceas much RMS value of wattage at 8 ohms as the speakers RMS value at 8 ohms. You'll need to leave the room because your ears will be throbbing before you'd do any damage to your speakers.

But yes, it's always important to follow these steps and be sure to connect your speakers and inputs (mikes, instruments, etc.) first, AND have the power level controls SET LOW, then power up, and then adjust the volumes up until you get your sound right.

Connecting speakers in parallel is a whole different topic, but it LOWERS the ohms resistance and yes, it takes lesser wattage to blow them.

What is DMA in 8085 in microprocessor?

DMA stands for Direct Memory Access, in regards to 8085 MP. It consists of 2 pins, namely, HOLD and HLDA. The former of which indicates the processor that either a peripherial or any IO device, is requesting the processor to hold its current activites and give the control of buses to IO devices. HLDA, on the contrary, is the acknowledgement from the microprocessor to the concerned IO device sending the request.

Westinghouse LCD TV problems?

Westing house tv has a light black square in the center of the screen

What are the advantages of the trinitron picture tube?

For each pixel position a Sony Trinitron picture tube uses a group of 3 very thin red, green and blue vertical lines of phosphorescent material. If you look closely at a Trinitron screen you will see hundreds of red, green and blue vertical stripes, very closely packed together, going across the whole width of the screen. Non-Trinitron tubes use triplets of tiny red, green and blue phosphorescent dots instead of lines. When it was first invented back in the early 1970s Sony claimed that the Trinitron system gives a sharper picture because, on the production lines in the factories, putting in place the phosphor lines could be controlled much more accurately than having to position millions of separate dots. Over the past 30 years systems for manufacturing picture tubes using triplets of tiny red, green and blue dots have improved so much that the Trinitron design may no longer have as much superiority as was originally claimed for it, but it is still an excellent system.

What is the purpose of a ASCII code?

ASCII-represents letters, numbers and symbols in a 7 bit code of 1's and 0's called binary. It is a standard developed in the 1960's for information interchange between data processing equipment (teletype and computers)

What is kink effect?

The 'kink effect' now-a-days used in semiconductor physics describes the design characteristic of a semiconductor device. The design earns it's name after 'Hofmeister kink effect' a car design which describes sharp streamlined type (by look) design of rear window bottom. The kink effect in semiconductor device describes such sharp heterojunction intentionally or unintentionally observed in the device.

What is the difference between microcontroller and ic?

IC stand for Integrated Circuit, so all microcontrollers is IC's but not all IC's is microcontrollers. There is millions of IC types with different porpoises some is microprocessors some is microcontrollers but most IC's has other functions like Oppamps, timers, logic gates, regulator ETC.

How many volts should a capacitor read if working properly?

Capacitors do not generate voltage by themselves. The voltage you read across the cap will simply be whatever voltage the external circuit puts into it. The answer depends, then, on the particular circuit, so there is no real answer to your question. It's like asking how much water is in a properly functioning bucket. The answer (which doesn't really help), is 'however much you put into it'...