Electronics Engineering

The tone frequencies, are selected such that harmonics and intermodulation products will not cause an unreliable signal. No frequency is a multiple of another, the difference between any two frequencies does not equal any of the frequencies, and the sum of any two frequencies does not equal any of the frequencies.

The use of the Global Positioning System and Geographical Information System (GPS/GIS) technology is growing at an astounding rate. Global Positioning System (GPS) is the only system today able to show one's own position on the earth at any time in any weather, anywhere. Whereas spatial data is the crucial component of a GIS. The important sources of spatial data's are the already existing digital files, maps, which can be digitized, and more recently GPS. GPS (mapping type receivers) can be used to map an area and the data

a 603 12F high current power, multi-emitter transistor.

Increase the volume.

In a non-reactive ckt, a simple measurement with an AC voltmeter is all that is needed.

In a reactive ckt, you must first address power factor, which can be metered also, and combined with the apparent voltage as above to calculate true rms.

current flowing into the node are taken to be negative, and currents flowing out of the node are positive. It should not really matter which you choose to be the positive or negative current, as long as you stay consistent. However, it may be a good idea to find out the convention used in your schema

A feed through capacitor is a type of capacitor (if you don't know how a capacitor works, look this up before going on) for bypassing RF voltage frequencies to ground of a transmitters chassis. It is built by putting a dielectric around a conductor and encasing it in a metallic tube.. so that the conductor is one plate and the outer tube is the second plate. They are shown in a schematic diagram by a straight line and a half moon to the side much like standard capacitor with the exceptions there are three connections. Two for the conductor plate and usually one for the outer shield. The higher frequencies that travel down the conductor plate 'pass through' (no current flows through the dielectric of a capacitor, unless it is leakage current or breakdown current) the dielectric to the outer case (typically grounded), while the lower frequencies (and DC) continue on through the conductor. So, in effect, what a bypass capacitor does is pass the DC current through it while bypassing the AC to ground of the chassis. The value of the capacitor will determine the capacitive reactance and what frequencies will pass more freely to ground.

The 7805 is a standard 5 volt regulator with a voltage input, a regulated 5V output and an earth reference. With no load on the 5V output, the current drawn by the regulator is nor more than a few milliamps. The actual figure varies from one type to another. Once a load is added to the 5V output, the current drawn from the battery is the same as the current drawn by the load itself (plus the few milliamps drawn by the regulator itself). As an example, if the load current is measured at 1 amp, then the current drawn from the battery will also be 1 amp. If current draw is a problem, then consider a switching regulator instead of a linear type. Switching regulators will be more efficient and for a 1 amp load, it is possible to see only a 0.6 - 0.7A current from the battery itself. as well as conserving battery life, the regulator will also generate less heat than the 7805.

A diode is a semiconductor electrical component that allows an electric current in only one direction.

A tunnel diode, or Esaki diode, is a special type of diode that can operate very quickly using quantum tunneling, allowing it to work even with microwave frequencies (current switching direction billions of times per second).

No, cell phones draw too much power to be supplied by solar cells, unless you used a large solar panel. But you certainly can't build a solar cell into the back of the phone like you would a solar calculator. For example, one web source says a cell phone draws about 1 W. Another web source says solar panels can put out about 1.2 W for 100 cm2 in bright sunlight. So to power the cell phone you'd need a solar panel at least as large as a CD, probably more like a sheet of paper.

A parallel resonant circuit has low impedance, when non resonant; however the impedance rises sharply, as the circuit comes to resonance.

12 uA can be stated as 12 X 10-6 A A scientist would usually say 1.2 X 10-5 A . An engineer would usually just say 12 uA. (uA is said as micro-Amps)

This is about the question I wanted answered; maybe I can point you in the right direction. The answer is more than the sum of 70 batteries as putting them in series increases the voltage and increases the total energy of the system. My question is where does the increase of energy actually come from?

The 89S52 has four different ports. Each one of the ports has eight input/output lines. The ports are used to output data.

It means that you are taking your anger at one person or situation and venting it towards an unrelated situation or person. An example would be getting in a fight with a parent and bening very angry but yelling at your sibling for no reason.

Mostly by considering what components were already available and making tradeoff analyses as to which of the available components that could do the job were best suited to their needs.

For example when Howard Aiken designed the Harvard Mark I and Mark II computers he considered both vacuum tubes and electromechanical devices (e.g. relays, clutches, odometer counters), but rejected tubes as likely to be too unreliable for the large number needed. He was satisfied with a slow but reliable machine.

When Eckert and Mauchly designed the ENIAC they rejected electromechanical devices outright without any tradeoffs as too slow. They insisted on a high speed machine and chose to cope with reliability issues as they arose.

I assume you mean flux density, In which case the formula is flux per m2 or (Wb)/m2 This unit is known as the Tesla (T). Therefore: (T)=(Wb)/(m2) hope this helps sinewave

Batteries have internal resistances built in them, a guideline that is carefully studied in battery manufacturing. Higher voltage over resistance implies higher power and hence heat build-up, huge build-up will weaken the battery structure by volume expansion. The aggressive charging/discharging will cause the metal ions to deform the cathode/anode in the battery respectively. The motion of ions in the battery, cathode to anode or visa versa, is intrinsic to the charging and discharging operation. If the cathode or anode is deformed, the surface area formed by the deposited de-ionised particle will yield less than intended due to abnormalities in the formation. Charging and discharging again at normal operation modes will not undo the damage done to the structure of anode or cathode.

Do not charge any battery type at more 10-15% voltage than you can draw from.

Charging at such high voltage compared to Battery voltage would cause battery explosion. The duration of improper charging before battery explosion is dependent on how much pressure is built up in the battery from heat generated by internal resistance and quality of casing that is housing the battery nodes and chemicals. Eventually, metallic gas will seep out of the battery causing acidic skin burns and metallic gas poisoning. Injury from flying battery fragments is possible at such insane charging modes.

In electronics, R or resistance is calculated by dividing the voltage by the current, or I/E

Here's a good Ohms law chart; http://www.the12volt.com/ohm/ohmslaw.asp

sampling theorem is defined as , the sampling frequency should be greater than or equal to 2*maximum frequency, and the frequency should be bounded..

i,e

fs=2*fmax

where fs= sampling frequency

In a TEM wave, both the E and H vectors are perpendicular to the direction of power flow, represented by 'S', the Poynting vector, which in turn is simply the direction in which the wave is travelling.

So neither has any component in the direction of propagation.

But are E and H necessarily perpendicular to one another?

Ex.: P = Pz ẑ

E = Ex x + Ey ŷ

H = Hx x + Hy ŷ

no, there's no such thing as free adult programming.

i need the answer for this question to improve my qualifications. i need the answer for this question to improve my qualifications.

You'll need to acquire a programmer board and the application software.

The programmer boards typically plug into your PC and you can write an application using the application software, then you can load the application into the microcontroller using the programmer board.