Gain Definition and 401 Threads

I would like to know somethings about the Q and its relation to gain in a parallel LC circuit. From what I know by tuning the Q to be high you can get a lot of gain at resonant frequency. Also to tune for Q the inductance has to be decreased and the capacitance has to be increased. Is this...

I was reading about a few mission that sent spacecraft s very far from the Earth. Like the Pioneer 10, which went past the asteroid belt, Jupiter, and lost contact with Earth on 2003. I tried to search for, but didn't find what those kind of spacecraft s use to gain speed in the space. I...

Does anyone know of an experiment or know where I can find an experiment to compare the heat gain or heat loss by a conductor and an insulator?

Hi I was plotting the bode plot for \frac{1}{s^2 + 1} . I found the following bode plot, http://home.iitk.ac.in/~varunag/prob2q1-uncomp.jpg" Here we can see two gain crossover frequencies. Thus two phase margins. On googling, I found this paragraph in a book: Which of the phase margins...

In the midband region the voltage is constant and is assumed to be unity and the transistor amplifier is always used in this region. Doesn’t that mean that there is no voltage gain??

Homework Statement "What is the physical origin of gain in a BJT?" I can figure out gain using gain equations but am having a hard time describing the physical origin of gain in a BJT.. can anyone help?

This is not homework, but a question I have posed for myself. In a linear, passive, 3-terminal RC network for sinusoidal voltage input how many resistors and capacitors are required to give an open-circuit voltage gain of 2? I've found some very complicated networks, but I'd like to find...

Photon can be emitted by an electron's changing of its orbit. As we know. photon always travels at speed c, never less. That means, a phone would acquire its speed c (relative to the electron/atom) instantaneously (i.e., in 0 elapse of time). What physical force could have made such a push? On...

all of the electronics textbooks say that you can make a unity gain buffer out of a non inverting amplifier by making R2 = 0 and R1 = infinity. Why does R1 have to be infinite? The TF for a non inverting amp is 1 + r2/r1, so as long as r2 = 0, and R1 should make a unity gain buffer, right...

Homework Statement How can the open loop voltage gain of an operational amplifier with AC input voltage be determined experimentally? Supply voltage for op amp is +9V. Homework Equations The Attempt at a Solution I'm really stuck here. I would appreciate some outline of...

I have a general interest in fusion energy and I'm currently looking at the 'fusion energy gain factor' (Q) of fusion reactors (the energy produced divided by the energy used to induce ignition). I'm aware that the JET recorded a Q factor of 0.7 in 1997, the ITER is anticipated to have a Q...

Hi, I'm building a STM, and this is the circuit I use : http://www.geocities.com/spm_stm/Simple_STM_Rev_C.PDF I'm right now testing the circuit I build. I build a small part (U3A), and then test it, and build another small part (U3B) and test, then connect the two and test it again...

Assuming your body is an engine which converts matter to energy, and that mass x gravity = weight, still holds true within the human body. How is it possible in a 24 hour peroid to eat 8 oz of food (dry weight) and 16 oz of water (dry weight) and 8 oz of milk (dry weight) and still gain two...

When a person can self-study and gain accreditation through certification exams? Are there examples of such examples in the IT industry, for example? Does the IT industry even care about one's credentials, irrespective of educational background?

Im studying gain saturation for homogeneous and inhomogeneously broaded transitions. Im a little confused bout the logistics of laser operation regarding the gain in the cavity. So from ground state, the atoms are optically pumped to produce population inversion(4 level system) where...

Homework Statement http://img440.imageshack.us/img440/9996/untitledbq0.png Homework Equations Please see picture. The Attempt at a Solution Please see picture. --- I have a strong feeling this is incorrect. I think I'm missing something important here... I don't know what...

Human interaction for personal gain of each individual.Is that the best summary of interaction between individuals.

1. Homework Statement This is all that is given. How much ice must melt at 0 deg. C to gain 6 g of mass? 2. Homework Equations I don't know any Relevant equations to this problem. 3. The Attempt at a Solution I have tried leaving mass as a variable and using Latent Heat...

Homework Statement This is all that is given. How much ice must melt at 0 deg. C to gain 6 g of mass? Homework Equations I don't know any Relevant equations to this problem. The Attempt at a Solution I have tried leaving mass as a variable and using Latent Heat Energys too. I...

Homework Statement How much ice must melt at 0 deg. C to gain 5 g of mass? Latent Heat of Fusion = Homework Equations I cannot seem to find many equations that relate thermodynamics and mass, maybe that is my biggest problem... The only one i could find was Q=Lm The Attempt at a...

I've heard that when an object is accelerated at huge huge speeds they actually gain mass. Is there a formula to see how much mass an object would gain will going a certain velocity.

Hello, I am fighting with a problem from grade 11 chem right now. The problem is why when sulphur bonds to other atoms, its ion charge often becomes 6+ or 2- while magnesium will always form an ion of charge 2+. I think I have an answer but am not sure. Is it because magnesium has a...

The following is an experiment I have to do: Using a thermometer, measure the temperature of the main food compartment of your refrigerator, and check if it is between 1 and 4°C. Also, measure the temperature of the freezer compartment, and check if it is at the recommended value of -18°C...

Just curious if anyone knows an approximate for the average rate of heat gain for a common fridge? I am going to do an experiment to calculate the average rate of heat gain in my fridge and want to know if my numbers in the ballpark

hi alll! just a quick one. You know when you design a controller - you go and plot the open loop transmission, L(jw) on a nichols plot, where L(jw) = C(jw)H(jw) P(jw) where P and C are the plant and controller respectively. You then 'manipulate' this plot (i.e. vary your controller) until...

Hello, Are there any coil setups for transformers that when tuned or combined in weird ways run with gain? I heard that coupled inductors for CB radio antennas do this, but are there any effects similer to this for transformers? I heard an account from someone who said that two out of tune AC...

hey guys. this has to do with determining the phase and gain margins of a system. i've read and understood the follwing: "To find GM, first find the phase crossover frequency, wGM. This is the frequency where the phase curve passes through -180. Get the magnitude at that frequency...

In the context of detectors of gamma rays, electrons etc. Does the term 'gain of the detection system' mean the ratio of the number of registered counts per bombardment from radioactive source?

:mad: A radioactive material emits 2 gamma rays with 2 energies 50 keV and 200 keV with equal probabilities the detector system has a quantum efficiency of 100% and 50% respectively at these 2 energies and the pulse heights are 1.0 mV and 4.0mV respectively. The pulses are input into a 512...

Hi i need information about th dbi and dbd... I know what db is but i am trying to understand dbi and dbd... Also i want to know what if the antennas or the tvs antennas has some gain.. I know that the gain refers to the antennas surface... that's why the satellite antennas have a big surface...

We're studying cell signaling and signal transduction in my biology class, and we discussed this briefly in class but I don't really understand it. Why does the affect of a drug decrease the more a person uses it? I don't understand. If someone takes a drug more, wouldn't there be more of the...

Hi all, I've been reading up on control theory, op-amps and other electronics related items. Open loop and closed loop gain keeps poping up and I just can't get a grasp of the concept. Can anyone provide a quick and dirt explanation and maybe an example? Thanks

During pregnancy, a woman's weight naturally increases during the course of the event. When she delivers, her weight immediately decreases by the approximate weight of the child. Suppose that a 120-lb woman gains 27lb during pregnancy, delivers a 7-lb baby, and then, through diet and exercise...

This is an opinion thread, so it doesn't matter where you lean or if you lean at all... what is your suggestion to Junior? I want to stop thrashing his azz for a while... so let's forget about the past mistakes and give feedback and guidance: "what can bushy do now?" I hope not to get...

Hi, I have a problem I am trying to work out on simple Op Amps gain, and I am having trouble trying to prove what the gain is. I know what the gain is supposed to be (see below), but I am stumped as to how to actually go about proving it. When I try to setup the Kirchoff node equations I get...

I need help with the two questions below please because i just don't understand it !1 Questions 1. A signal processing system consists of a preamplifier, an amplifier and a filter connected in series. At a given frequency the preamplifier and the amplifier have gains of 12 dB and 31 dB...

Wow, just found this great little link that gives an awesome perspective on the scale of things. Just thought I would share: http://www.pbs.org/wgbh/nova/elegant/scale.html

Can someone please explain what exactly the gain curve of a laser is? Is it exactly the same thing as the natural linewidth of the laser [a graph of intensity vs frequency] or am I off track? I found this graphhttp://www.phys.ksu.edu/perg/vqm/laserweb/Ch-5/C5s1p5.htm that tries to explain...

Came across another question during my exam review. Seems to me like there is insufficient data again. When the space shuttle delivers a crew to the international space station, it usually boosts the orbit of the station from about 320 km to 350 km. How much energy does the shuttle add to the...

Hi, I'm having difficulty understanding how the gain of an antenna works. I appreciate that the gain effectively concentrates the available RF energy into a narrower beam but i can't fathom how this seems to mean that if i have a transmitter transmitting at say 100dBm that i can use antenna...

Greetings! I posted a few weeks ago about the preamp for the tape head I'm working on. I solved for all of my resistors and capacitor to get the right frequency response, and below is the theoretical frequency response, followed by what I actually get...

urgent help needed Can anyone tell me what purpose unity gain buffer amplifiers serve and why do you connect 2 low pass filters of same corner frequency by cascading them using one of these op amp buffers and not directly together. Also can you show me the diagram of this and where the...

I have been looking for info on the physical basis for this antenna equation : Gain = 4 * Pi * (Effective Area ) / Wavelength^2 I have found some tutorials that say it is based on reciprocity, and more specifically, on thermodynamic balance between a resistive load connected to an antenna...

I am supposed to calculate the gain of the circuit given in the attachment. I have attached it in a word file. Z is the generic term for the effective resistance. I get that Z is Z = [jwL +(R/jwC)]/(R+1/jwC) Can someone tell me if this is correct? Also, now for the gain, it is...

This was a very interesting article on sleep http://health.yahoo.com/health/centers/sleep_disorders/_101.html

Hi, I've asked someone to make me a parabolic mirror for a robot and they want to know the 'mirror gain' i would like. Does anybody know what 'mirror gain' is? thanks

What would the suggested effect from the results of this experiment on the predictions for the end of the universe, especially if it was a 'cold death'. The people doing the experiment mentioned that the state of cesium used existed at a near absolute zero temperature. In an older universe...

can the water (100 oC) gain latent heat energy from the same temperature object?

I need to know whether to invest in a new lighter axel for a go kart Before I take the plunge, I'd like to get "some" kind of idea of the kinds of gains one can expect from this kind of change. The conditions as I know Them. the 5Hp engine achieves max torque at 5200-5400 RPM...

One form of the Uncertainty Principle is given by \Delta p \Delta q \geq h where \Delta p is the change in momentum and \Delta q is the change in position and h is Planck's constant. If both side of the inequality is raise to the power n, does the new inequality expresses more certainty...