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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 a Cave Lighting project?
The idea of the project under the sounding name "Cave Lighting" arose less than a 3 year ago. In the course of the human development different light sources were used in a show caves. The main target of the "Cave Lighting" to develop and install in the show caves a new lighting systems based on the high power LEDs. s. www.cavelighting.com You can contact project manager Alexander Chrapko under phone number: +49 2772 575218 or by e-mail: ac@germtec.de
What is the best and worst transmitter of sound?
The worst would be a vacuum.
The best probably depends on your definition of "best", but maybe something like superfluid liquid helium?
It's all relative. A battery has internal resistance. Batteries are not "ideal" voltage sources. If there is a "heavy" load on the battery (low resistance), the voltage you measure on the outside of the battery will be lower. A car battery is normally thought of as a 12 volt battery. When there is no load (disconnected) you can often measure in excess of 13 volts if it's fully charged. During normal cranking of the engine, the voltage can drop below 11 volts.
What circuit produces a high output when two inputs are unequal?
Not sure about the comparator. XOR is what I came up with, so we have two XORs.
This is the "exclusive OR" logic function. Build one out of standard resistors and transistors, or buy an IC with the XOR function already implemented, or use four two-input NAND gates. At least that's the way we did it in the 1960s. In analog circuits, a comparator.
Does a cathode ray produce red fluorescence?
The cathode ray is just a beam of electrons.
The color of the fluorescence depends on the substance in the target.
Is there a schematic drawing for a full adder?
Wikipedia has one under "Adder". I apologize, it is not easy to draw such things here.
Name four uses for vabiable resistor?
Volume Control
Light Control
Speed/Frequency Control
Temperature Control
Does modem turns analog signal into digital signal?
The -dem part does. The mo- part goes the other way. "Modem" is an abbreviation for "modulator-demodulator".
How the OR addition different from the ordinary addition?
A: OR gates does not perform addition or any other mathematical function but rather makes logical decision on true or false on two [ more] inputs both input are false then the output will be false "0" that is the only premise for an OR gate.
The AND gate perform another logic function such as both [more inputs] must be true "1" for the output to be true/ mathematical calculations are achieved by using binary numbers that a machine [computer] understand
What is the difference in construction between power diode and simple diode?
Basically the semi-conductor junctions are a larger surface area and heat sinks are part of the design to dissipate heat.
What is principle of communication system?
The principle of passing information from one place to another.
Why indirect band gap material is used for manufacturing LED's?
Optical sources like LEDs use direct band gap so that conduction band electorn can recombine directly with a hole in valence band .
What does I stand for in the Ohm's Law formula?
I is the current ( Amps) in the Ohm`s Law formula; V= I*R
How do you build a homemade ground ultrasound machine?
"As is the case with X-rays this is no hobby for the amateur or (Ham). As far as I know it is illegal for an amateur to construct or operate an Ultrasound machine as you describe it and these are (completed models) restricted to licensed Medical Labs and practitioners. In other words it"s for the most part and for the soldering-iron types, against the law! I have never even seen an advertisement for a kit or schematic plans for such a device. Try something more palatable like weather computers(there were both analog and digital varieties) or maybe Night Vision devices."
The answer above is completely absurd, and does not even address the question. First of all, comparing ultrasound to x-rays, shows no knowledge of science. Ultrasound is merely sounds waves of higher frequency than can be detected by human hearing. Unlike x-rays which are electromagnetic energy, and are dangerous to human health if overly exposed. The answer also confuses ultrasound medical devices with what the question is asking, which is about ground penetrating ultrasound machine. Npw to address the question. Ultrasound, as mentioned, is high frequency sound. The problem here is that these waves do not penetrate very far into the ground and are unsuitable for detecting buried objects. Traditionally the mining industry uses explosives to generate the sound waves needed for deep ground penetration. Relatively small explosive charges are placed into holes, and microphones are placed in a matrix to record the shock waves bouncing back. Then the data is post-processed with powerful computers to create images of the sound waves resulting from the explosions. So, building a homemade version of this is probably impractical. There are portable ground penetrating radar machines, but that would be a whole different question.
The above answers do not take into consideration the research going on since the 1990's into ground penetrating ultrasound devices for landmine detection. The single drawback these devices have is the requirement of having a water saturated ground environment for the ultrasound to render clear and meaningful pictures. But, when operated in such an environment, they produce top quality high resolution photos of all kinds of materials - not just metals. Seeing something as tiny as a hairpin, at more than a meter - or being able to tell if a dime is heads or tails under a foot of soil.
When all parts of a circuit are composed of conducting materials the circuit is said to be?
When all parts of a circuit are composed of conducting materials, the circuit is said to be closed.
One condition could be a closed circuit, however it could be open if the components are not assembled or are assembled incorrectly.
What is technical support engineer?
A tech support engineer is responsible to troubleshoot any problem related to computer hardware and software. High quality and excellent tech support are expected from him. The support engineer must have the knowledge of networking, programming, desktop support issues, and database problems. He is an expert of IT and guide the staff, users and clients in all the aspects of IT.
Source: http://www.networkfish.com
Difference between de-mosfets e-mosfets and jfets?
The basic theory of operation is the same, but the device structure is different. With both a MOSFET and a JFET, a conductive channel is established between two terminals (the drain and the source). The structure of the gate terminal makes the difference between the two. In a MOSFET, the metal gate is separated from the channel by an insulator (the O in MOSFET means Oxide, the insulator). In a JFET the gate is a doped region essentially within the conductive channel.
FPGA - Field-programmable gate array is a semiconductor device containing programmable logic components called "logic blocks", and programmable interconnects.
What is the minimum voltage necessary to operate a light emitting diode?
That will vary with the type (i.e. "color") of the LED: IR LEDs operate at the lowest voltage (1.2V), red LEDs operate at low voltages (1.8V), green LEDs operate at medium voltages (2.5V), blue LEDs operate at high voltages (3.3V), and UV LEDs operate at the highest voltages (4V). Intermediate color LEDs operate at correspondingly intermediate voltage between those given above. The reason an LED cannot produce light below these voltages is it takes more voltage drop to get the energy to produce higher energy photons and the different types of binary semiconductors needed to produce each color/energy of photon result in different junction forward bias voltages.
However LEDs are really current operated devices, not voltage operated devices, so they need a series resistor or a current source to limit the current through them. Simply applying a voltage source with the necessary "minimum operating voltage" across an LED will generally destroy it instead of lighting it.
