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Electronics

Electronics are a branch of technology and science that deals with the control of the flow of electrons.

3,725 Questions

Will reverse polarity damage equipment?

Reversing polarity will most likely damage electronic equipment, especially semiconductor components such as transistors, diodes and LED devices if the voltage is high enough. Other devices may not function at all, will be unaffected (such as incandescent light bulbs), or may work backwards (such as some DC motors.

How can one purchase electronic guitar package online?

They can purchase the electronic guitar package through amazon or other trading sites. Craiglist is one example that you will find different types of guitar for different values.

Why no triggering is used for astable multivibrator?

No triggering is used on an astable multivibrator because it can cause it to become unstable.

What are fun things to say to siri?

"Siri where's a good place to get rid of a body"

then say,

"How about a swamp?"

Or say "Siri, you're the only one for me"

How much watts does a garage opener use?

Garage door openers have a "starting watts" and "running watts" ratings. A 1/4 horsepower generally has a starting watts rating of 1,100 and running of 550 watts. A 1/2 horsepower opener uses 1,400 starting watts and 725 running watts.

These are general ratings and to be more precise you would need to know the brand, model and other information on a specific opener.

Difference between avalanche and zener breakdown voltage?

"'Zener diode' and 'avalanche diode' are terms often used interchangeably, with the former much more common. Both refer to breakdown of a diode under reverse bias. Specifically, when a diode is reverse biased, very little current flows, and the diode is to a first order approximation an open circuit. As the reverse voltage is increased, though, a point is reached where there is a dramatic increase in current. Equivalently, there is a dramatic reduction in the dynamic resistance (slope of the V-I curve) that can be as low as 1- 2 W in this region.ÝThis voltage is called the reverse breakdown voltage and it is fairly independent of the reverse current flowing.ÝThis property makes it ideal as a voltage reference.Ý "Avalanche breakdown is caused by impact ionization of electron-hole pairs.ÝWhile very little current flows under reverse bias conditions, some current does flow.ÝThe electric field in the depletion region of a diode can be very high. Electron/holes that enter the depletion region undergo a tremendous acceleration.Ý As these accelerated carriers collide with the atoms they can knock electrons from their bonds, creating additional electron/hole pairs and thus additional current.ÝAs these secondary carriers are swept into the depletion region, they too are accelerated and the process repeats itself.ÝThis is akin to an avalanche where a small disturbance causes a whole mountainside of snow to come crashing down.Ý The efficiency of the avalanche effect is characterized by a so-called multiplication factor M that depends on the reverse voltage (Equation 1). Equation 1: Multiplication Factor "Here n is in the range 2 - 6, V is the applied (reverse) voltage, and Vbr is the breakdown voltage.ÝThis is an empirical relationship, as are many of the relationships used to describe both Zener and avalanche breakdown.Ý "Avalanche breakdown occurs in lightly-doped pn-junctions where the depletion region is comparatively long.ÝThe doping density controls the breakdown voltage.ÝThe temperature coefficient of the avalanche mechanism is positive.ÝThat is, as the temperature increases, so does the reverse breakdown voltage.ÝThe magnitude of the temperature coefficient also increases with increasing breakdown voltage. For example, the temperature coefficient of a 8.2 V diode is in the range 3 - 6 mV/K while the temperature coefficient of an 18 V diode is in the range ofÝ 12 - 18 mV/K. "Zener breakdown occurs in heavily doped pn-junctions.ÝThe heavy doping makes the depletion layer extremely thin. So thin, in fact,Ýcarriers canít accelerate enough to cause impact ionization.ÝWith the depletion layer so thin, however, quantum mechanical tunnelingÝ through the layer occurs causing current to flow.ÝThe temperature coefficient of the Zener mechanism is negativeóthe breakdown voltage for a particular diode decreases with increasing temperature.ÝHowever, the temperature coefficient is essentially independent of the rated breakdown voltage, and on the order ofÝ -3 mV/K. "In a 'Zener' diode either or both breakdown mechanisms may be present. At low doping levels and higher voltages the avalanche mechanism dominates while at heavy doping levels and lower voltages the Zener mechanism dominates.ÝAt a certain doping level and around 6 V for Si, both mechanism are present with temperature coefficients that just cancel. It is possible to make Zener diodes with quite small temperature coefficients.Ý "Neither Zener nor avalanche breakdown are inherently destructive in that the crystal lattice is damaged.ÝHowever, the heat generated by the large current flowing can cause damage, so either the current must be limited and/or adequate heat sinking must be supplied."

Which stores sell Bluetooth electronics?

Bluetooth electronics are available from general retailers like Walmart and Target and electronics stores like Best Buy and Apple. They are also available online from websites like Amazon and eBay.

How is information captured in an electronic signal?

Information is captured in an electronic signal with patterns in the controlled flow of electrons through a circuit.

Will you lose your data if you remove the battery?

On a laptop computer? Not if the data has been saved and the computer has been properly switched off before the battery is removed.

How can you tell if your speaker is blown?

It may not make any sound, it may make a small crude sound, take the speaker and smell the open part of it. if there is any burning smell then there is a high chance that you have blown your speaker. Push on the cone. If it will not move than it is not customer servicable. If it is making extra crnching noise it is blown. If it moves VERY easily there is a small chance the coil burnt itself off of the former. Also the coil could've liquified.

What type of valve or tube does the Kustom WAV 210 use?

It provides four separate, tube-driven Lead channel preamps (Clean, Classic, Crunch, WAV).

What is darlington emitter follower?

A darlington emitter follower is two transistors operating as one. Both collectors are tied together. The emitter of the first is connected to the base of the second.

The darlington exhibits very high gain. If hFe, for instance, on each transistor was nominally 100, the effective hFe would be nominally 100 squared, or 10000.

The emitter follower is a common collector configuration where the emitter tracks the base, offset by the base-emitter forward junction voltage. In a darlington, there are two junctions in series, so the effective junction voltage is about 1.4V.

Voltage gain of the darlington, like any emitter follower, is one, or unity. Current gain, however, is limited only by the power supply, the transistor, and effective hFe. In the darlington configuration, current gain is effectively considered to be large enough to be thought of as "infinite".

How do you get I zz2 in gt5?

You have to be lucky and find it in the Online Collectors Dealership or get it from the used dealership.

(Pls give me a trust point! I am happy to help with more gt5 stuff :))

What are the advantages of weee?

According to the EU WEEE Directive: "The objectives of the Community's environment policy are, in particular, to preserve, protect and improve the quality of the environment, protect human health and utilise natural resources prudently and rationally. That policy is based on the precautionary principle and principles that preventive action should be taken, that environmental damage should as a priority be rectified at source and that the polluter should pay... the achievement of sustainable development calls for significant changes in current patterns of development, production, consumption and behaviour and advocates, inter alia, the reduction of wasteful consumption of natural resources and the prevention of pollution. It mentions waste electrical and electronic equipment (WEEE) as one of the target areas to be regulated, in

view of the application of the principles of prevention, recovery and safe disposal of waste."

So as an overview the advantages of WEEE, as described by the European Parliament and Council, is to reduce the pollution and damage to living creatures and the environment caused by waste electronics and electricals by placing the responsibility for safe disposal on the producers of electronic and electrical goods.

How do i get the screen lock off your ipod nano?

You have to go on itunes and click restore. This will make it go to it's original settings and erase all your music. Before you do this make sure you backup all your music. I just did this.

If you don't want to lose your music:

(Note: I did this in Linux, so you non Linux users might have a little more trouble)

Plug your Ipod into a computer (Dock or Cord)

Access your iPod, find a way to see hidden files (in windows you can via file options, mac... i don't know)

Once you can see a folder called "iPod_Control" enter it

Next you will see a folder called "Devices" Delete it.

Eject your iPod, once you start it up, it will ask you what language you prefer. ohh, and if you put your iPod back in your computer, and go back to iPod_control the folder devices is restored.

Last step, go to screen lock, and put in a new password (or just leave it blank)

Your songs and playlists are still intact :D :D

Why is quartz used in so many electronic devices?

When a tiny alternating voltage is applied across a quartz crystal it oscillates very precisely. The oscillations can therefore be used as a clock.

What is pulse position demodulation?

Pulse-position modulation (PPM) is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of 2M possible time-shifts. This is repeated every T seconds, such that the transmitted bit rate is M/T bits per second. It is primarily useful for optical Amplitude_modulation_compared_to_Pulse_position_modulation'systems, where there tends to be little or no multipath interference.

Read more: Amplitude_modulation_compared_to_Pulse_position_modulation'

This answer is lifted from response to "Amplitude modulation compared to Pulse modulation", so the original answerer gets credit for a great answer.

What happens to a merchants house if you killed him in Oblivion IV can you use his house as your home?

No, it won't work. The contents of containers will reset and your stuff will be gone. The bed will still count as owned, and guards may enter and arrest you for trespassing as the property is still owned too.

Most cities have a house that you can buy.

What does a crystal do in an electronic circuit?

A quartz crystal oscillator (often shortened to "crystal" or even "xtal") is an important part of many electronic circuits.
Inside its metal can, it mechanically resonates at a very precise frequency.
(The manufacturer writes the frequency of the crystal on the outside of the can).

The 3 most common applications for that frequency are: pacing (synchronization), timekeeping, and radio communication frequency matching.

An "oscillator circuit" uses that crystal and a few other components to generate a metronome-like electrical signal called the "clock" (often shortened to CLK).

That clock signal is typically sent to practically every digital chip in the box.
Those chips use that clock for synchronization.
The clock pulse tells each chip that all the outputs from the other chips have settled, and its inputs are now valid.
The system designer specifically chooses a crystal that will give a pace slow enough that even the slowest chip has settled at the end of each step.

Each chip takes a certain amount of time from when it gets a new input to the time its outputs stabilize with its new output.

timekeeping ...

radio communication ...


rare exceptions:

A few digital systems don't use a global clock signal, such as asynchronous computers.

A few electronic circuits use piezoelectric crystals (silicon or PZT crystals) as buzzers and ultrasonic transducers.

A few electronic circuits use other kinds of crystals -- photonic crystals, ferroelectric crystals, etc.

Each integrated circuit is made from a slice of crystal, but we call them "chips" or "ICs".

Is the internet an American invention?

Short version: Yes

Long Version:

The Internet started out as a ARPANET (Advanced Research Projects Agency Network), a project by the United States Deparment of Defense to facilitate quick communication between remote computers. It was based on the idea for a 'Intergalactic Computer Network' by American computer scientist, J.C.R. Licklider, in 1962, who would also go on to lead the development of ARPANET. During the development of ARPANET, the two basic concepts that make up how the internet works were created and developed: Packet Switching and TCP/IP.

Packet Switching is the method used for breaking down data into 'packets' to more efficiently transfer them over a network. It was principally invented by Polish American scientist, Paul Baran, based upon the mathematical concept of 'queuing theory' developed by American engineer Leonard Kleinrock a couple of years earlier. The term 'packet switching' was coined by a Welsh scientist named Donald Davies, who coincidentally developed a similar method, a few years after Baran first published his own. While Baran invented Packet Switching first, the name that Davies gave it, was more catchy, which is why we call it that today.

TCP/IP stands for Transfer Control Protocol and Internet Protocol, and it is basically the set of rules for how computers talk to eachother. TCP/IP was invented and developed by two American scientists named Robert Kahn and Vinton Cerf for the ARPANET project.

While there are many people involved in the development of the internet, these are the key figures, who are responsible for inventing and developing the key concepts for how the Internet works

ARPANET switched online on August 30th 1969, making that the birthday of the Internet.

Originator: J.C.R. Licklider

Packet Switching: Leonard Kleinrock and Paul Baran as the originators, and Donald Davies for coining the name 'packet switching'.

TCP/IP: Robert Kahn and Vinton Cerf

So in short, yes the Internet could rightly be called an American invention.

The Internet is often confused with the World Wide Web, created by British scientist, Timothy Berners-Lee and Belgian scientist Robert Cailliau in 1989. The WWW is a system for accessing documents via the Internet, using the concepts of HTTP and HTML. It is basically a more user friendly way of accessing and displaying information on the Internet, but it is only an application that exists on top of the Internet, and it is not the Internet itself, which had already been around for some 20 years prior. Some other commonly used Internet applications are E-mail, File Transfer Protocol and Internet Relay Chat. A once popular application was 'usenet' an early type of message board, that lacked the central server of modern day web forums, to whom usenet has ceded its popularity over the years.

Sources: http://www.livinginternet.com/i/ii_arpanet.htm