Amp Definition and 377 Threads

Homework Statement I am planning to use a Li-ion battery running my 4 small pmdc motors rated at 24V and 0.5amps. Is 24V 10Ah battery enough to provide sufficient power to run my application? There is a current controller which is rated at 3amps and voltage upto 44V. I want to restrict the...

Hi folks, I've been looking into http://en.wikipedia.org/wiki/Operational_amplifier_applications#Integrator" as a way to add ramps to signals. I'd like to get a ramp rate on the order of 0.1 V/s, which suggests the use of capacitors in the neighborhood of 10-100 uF. Many electrolytic and...

Can I feed a 1200 amp 3phase AC electrical service with 2 separate 150kva power sources? (the sources being 150kva 120/208 3phase gas powered generators) Are there any issues with harmonics from seperately derived systems? Will each phases voltage still be 120v or by combing 2 seperately...

http://i454.photobucket.com/albums/qq261/integralx2/opamp1.jpg I don't understand why they did something. I found output voltage to be -1.25v , but to find voltage across the 10k resistor, its (Va-Vo)/10k am i correct? cause when i do this and try to calculate the answer for Io its not right...

I was just curious if it would be possible to make my E-bike run on capacitors instead of Lead acid batteries even if the range was much shorter. So how many Farads would equal 1 Amp hour? At 12v let's say for now. Thanks!

Homework Statement G'day, the op-amp circuit is attached. Need to know the Transfer Function. Homework Equations Using Ideal analysis. In=Ip=0A, and Vn=Vp Vo/Vi=-15 The Attempt at a Solution I have had many attempts at it. Because We don't know the input current (no input...

What is the ultimate tube amp?

[SOLVED] Nuclear Physics - Mass Defect & Binding Energy 1. Carbon 12 (^{12}_{6}C) has a nuclear mass of 1.99264 x 10-26 kg, a proton has a mass of 1.67353 x 10-27, and a neutron has a mass of 1.67492 x 10-27 kg. Calculate the mass defect for carbon 12. My equation looks like this...

I have a 38 watt amp and I'm trying to figure the Power it produces, but I'm not sure how to find the Velocity. Can anyone clue me in on this? And I know to use the P=V^2/R And sorry if this is in the wrong forum, I'm new. Thanks EDIT: I just found V=f/Lw (velocity=frequency/wavelength) but...

Hello, I would like to build a Voltage Amplifier, I did one with 2 Transistors but doesn´t work, it doesn´t amplify. Do you know pleas how to build an Amplifier with transistors and resistors? an easy one with no more then 2 or 4 transistors please. Do you all think it´s possible? Ciani

Hey guys, was just considering what happens when you apply a high current to the base in a non-inverting amplifier. Looking at a transfer characteristic, it would result in the signal being 'cut off' as it would be greater than the Vcc. My question is this, what happens to the collector current...

[SOLVED] Mechanical Energy vs Potential Energy & Kinetic Energy I'm pretty sure I did this one wrong, =( please help clarify? 8. At the Calgary Stampede, you can win a prize if the bell rings when you strike a wooden block with a 10.0-kg hammer. The block is at one end of a lever. The...

[SOLVED] complex analysis - maximum modulus &amp; analytic function Hi all, I'm having difficulty figuring out how to do the following two problems in complex analysis. I need help! 1. Consider the infinite strip -\pi< I am z < \pi. Does maximum modulus principle apply to this strip? Why or...

[SOLVED] Dimensionality, Rangespace &amp; Nullspace Problem Homework Statement Prove (where A is an n x n matrix and so defines a transformation of any n-dimensional space V with respect to B, B where B is a basis of V) that \dim(R(A) \cap N(A)) = \dim R(A) - \dim R(A^2) The attempt at a...

[SOLVED] Local Max &amp; Min problem I'm having a real tough time finishing this problem. I have to find the local maxima and minima points for g(x). g(x) = 1 + 4x - 10x^2 + x^4 (dy/dx) = 4 - 20x + 4x^3 I've been trying to factor it to get the max and min points, but I find it...

[SOLVED] Lifetime &amp; Branching ratio Hi! In my book Particle Physics by Martin & Shaw, eq 2.15: Lifetime: \tau _l = \dfrac{B(l^- \rightarrow e^-\bar{\nu }_e\nu _l )}{\Gamma (l^-\rightarrow e^-\bar{\nu }_e\nu _l )} Where B is branching ratio and Gamma the decay rate and l is a...

[SOLVED] Calculate Friction based on v, t, m &amp; F Homework Statement A dragster reaches 350km/h from rest in 6.2s. If the car is 800kg and generates a driving force of 1600N, find the force of friction acting on the car.Homework Equations Fnet = maThe Attempt at a Solution I tried...

For the INA101, in the configuration for the most basic circuit with the TO-100 package, two 1 mircofarad capacitors seem to be required to be placed in parallel with the supply voltages. Why is this, and is it actually necessary for an operating circuit, since the circuit example with the Dip...

[SOLVED] Circuits Op Amp R equilvalent help! Homework Statement I'm working on Ideal op amps and I need to find the R equivalent of the system. I'm not sure if this term is used in other places but R equivalent = total Resistance of the circuit...

[SOLVED] Op Amp Requivalent Please help! Homework Statement I'm working on Ideal op amps and I need to find the R equivalent of the system. I'm not sure if this term is used in other places but R equivalent = total Resistance of the circuit. http://img169.imageshack.us/img169/4386/reqrk6.png...

[SOLVED] Word problems (volume &amp; work by integrals) Homework Statement a) A pie-dish with circular cross-section is 24cm across the top, 16cm across the bottom and 6cm deep. Find the volume of the dish. b) A water tank in the form of a cylinder with height 20 ft and radius 6 ft is...

Homework Statement Sorry this computer doesn't have access to PSPICE and I don't have a scanner, but let's say that I have an op amp. 1) there is a time varying voltage source Vs 2) There is a resistor R1 connected to the inverting input of the op amp 3) The noninverting pin is connected...

[SOLVED] Normalizer &amp; normal subgroup related Let H \subset G. Why is H a normal subgroup of its own normalizer in G?

[SOLVED] Rigid Objects in Equilibrium &amp; Center of Gravity Homework Statement http://img149.imageshack.us/img149/8568/0968lr6sc4.gif A lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.220 kg, and its center of gravity is located at...

Hi, everyone I am new around here and was wondering if anybody could answer some basic questions for me? 1. I was wondering how you would make an electrical connection or for example a direct connect from a battery to switch the electrons to be only negative or only positive. 2. If you...

I am designing a circuit using ua741 opamp to obtain a gain, in order to get a output on one of the inputs such as V1 should I ground the other two inputs and have a 0 voltage on ac or dc and also should I use ac or dc source because the professor did not specify..

[SOLVED] Vertical Circular Motion &amp; Centripetal Acceleration Homework Statement 1) A car travels at a constant speed around a circular track whose radius is 2.1 km. The car goes once around the track in 410 s. What is the magnitude of the centripetal acceleration of the car? Homework...

[SOLVED] Osmotic Pressure &amp; Mass Percent A solid mixture of KCL, KNO3, and Ba(NO3)2 is 20.92 mass percent chlorine, and a 1.000g sample of the mixture in 500.0 mL of aqueous solution at 25 C has an osmotic pressure of 744.7 mm Hg. What are the mass percents of KCl, KNO3, and Ba(NO3)2 in...

[SOLVED] Hilbert space &amp; orthogonal projection Homework Statement Let H be a real Hilbert space, C a closed convex non void subset of H, and a: H x H-->R be a continuous coercive bilinear form (i.e. (i) a is linear in both arguments (ii) There exists M \geq 0 such that |a(x,y)| \leq...

Homework Statement For the following circuit, sketch v2/v1 as a function of R4, if R1=R2=R3=R5=R. Also explain the behaviour of the circuit when R4=R/2. Homework Equations The Attempt at a Solution After solving the circuit, i came up with v2/v1=2R4/(2R4-R). Now, if R4=R/2 ...

Homework Statement The op amp circuit shown bellow is intended to provide any gain between -10 (for k=0) and +10 (for k=1) by adjusting the potentiometer. Let R1 and R2 have the scaled values, show that.. V2/V1= {r1/(r1+10k)} [-11/{1+(10kr1/r1+10k)}] + [r2/r2+10(1-k)] [1+...

[SOLVED] Gravitation &amp; Escape Speed - Stone leaving Earth and reached the Moon. Hello everyone, I have one question on gravitation and escape speed. In the earlier part of the question, the minimum speed for the stone to leave the Earth is calculated and its final destination is the Moon...

Hi, I'm building an integrator using an op-amp to integrate 15 volt 65nS pulses at a repetition rate of 100Khz using a 20uS time constant. Can anyone recommend a suitable op-amp for this application. It needs to have very low input bias current to minimise d.c. drift and have sufficient...

For the circuit below, find Vx and Vo. http://www.freewebs.com/mushg/FWThumbnails/OpAmp.bmp

[SOLVED] Accuracy &amp; Error Hi Everyone, Just a quick question regarding Accuracy & Error. We have been doing this for a little while (University) and I'm slightly confused with one of the problems. I am able to do something like this and achieve the working and answer: (7.3 ± 0.4) x (1.2...

[SOLVED] Real analysis - show convex functions are left &amp; right differentiable Homework Statement Let f:R-->R be convex. Show f admits in every point a left derivative and a right derivative. Homework Equations A function f:R-->R is convex if x1 < x < x2 implies f(x)\leq...

[SOLVED] Torque &amp; Angular Speed Homework Statement The wheel of an engine has a moment of inertia 2.80kgm^2 about its rotation axis. What constant torque is required to bring it up to an angular speed of 360 rev/min in a time of 7.60 s, starting from rest? What is its final...

What does it mean when an op amp has only a minus sign in its symbol? Is the positive terminal at ground, or is it at some arbitrary voltage?

Homework Statement I have an op amp with two electrode inputs. Each input has 5V of common 60 Hz noise. The size of the signal I want to measure is 9 mV. Signal to noise ratio needs to be 10 to 1. Homework Equations I know that CMRR = 20 log (DMG/CMG), where DMG is differential mode...

Here's my problem: Rs is a resistor whose value depends on temperature. Rs = R0 - 1.8T, where R0 = 5000 ohms and T is in Kelvin. If the ideal op amp has +/- 15 V power rails and you want to maximize the circuit's sensitivity, what should Rf be on the op amp? What is your maximum...

[SOLVED] Bernoulli, Poisson &amp; Normal Probability Homework Statement Every chocolate bar contains 100 squares, with 10% of the individual squares presenting a health hazard to people consuming them. (a) Using the Binomial, Poisson and Normal distributions, write down formulas for...

I know that in car audio systems amps are used to increase power to the speakers especially the subwoofers but how exactly does it do that? If an amp is 1000 watts and watts is volts times amps than what is the amp doing to make the 1000 watts? Also in some cars that have systems that are...

I came across a schematic of a buffer amplifier utilizing a p-channel fet as input. It is from a sweep oscillator generating a ramp voltage by charging C3 and C4 with a constant current, (current source is not shown, Q2 just acts as a switch or buffer). Now as the voltage rises linearly across...

Homework Statement In the circuit below, determine v_o(t) for t > 0. Let V_{IN}\,=\,u(t)\,V, R_!\,=\,R_2\,=\,10\,k\Omega, C_1\,=\,C_2\,=\,100\,\muF. http://img249.imageshack.us/img249/3840/problem867cg5.jpg Homework Equations i_c\,=\,C\,\frac{dv_c}{dt} The Attempt at a...

[SOLVED] Change in Tension &amp; Fundamental Frequency of a String Problem. Show that if the tension in a streched string is change by a small amount \Delta F_T, the frequency of the fundamental is changed by a small amount \Delta f = 1/2 (\Delta F_T / F_T) f. Let T be the intial tension and h...

I was researching a bit about the common-base configuration of a BJT transistor on wikipedia, and I found this quote: "This arrangement is not used as much as other configurations in low frequency circuits but is often employed for amplifiers that require an unusually low input impedance, for...

1. http://img248.imageshack.us/img248/8971/opampanalysisxe2.png Assume that the op amp in the circuit shown is ideal. a.) Find the output voltage when the variable resistor Rx is set to 60k Assuming Ideal Op amp. All currents leaving nodes are negative. V+ = V- = 0 and In = Ip = 0...

I'm new to op-amps, and would like some guidance. I have a quick question on this HW problem. I'm not asking you to do it for me, but I want to see if my hunch is correct: http://img66.imageshack.us/img66/8872/screenshot01bb7.jpg Now, using ideal op-amp model... I'm going to assume: V+ = V1...

Homework Statement Design an op-amp that uses a variable 50k ohm resistor. when this variable resistor is at one extreme, the gain is 13, and at the other extreme, the gain is 3. you may use up to 2 op-amps, and up to 7 resistors (including the variable resistor) The Attempt at a Solution...

Here I have an elusive schematic of a 20 dB amp at around 20 MHz. It works as a unity gain amp when the control line IFG2 is open. When grounded it amplifies by 20 dB. The diode is a pin diode and supposedly has 83 ohms when the current is flowing through it. The +10 volts comes from a...