Op amp Definition and 307 Threads

I have this problem where it's asking for the unknown voltage V(b). What information I get is what is in the image provided and that R1= 1 ohm. Okay so as I start this problem I remember that the voltage drop across the terminals is pretty much equal to zero because the current flowing through...

Op Amp Circuit -- Simple non-inverting circuit question Homework Statement Image2. The attempt at a solution 0V*(236k/R1) + (-0.1cos(500t)*(236k/1k)) = 23.7cos(500t) Is this the correct setup of the equation because there is no R1 variable to solve for...?

Homework Statement Please check attached image. I am doing some op amp practice problems and I came across this problem: I have to find the potential at the inverting input of the simple circuit model of the op amp. The op amp would be a basic inverting amplifier. I have to give the...

Homework Statement What is the output voltage for an op amp whose non-inverting input is connected to ground and its inverting-input voltage is 4mv? Assume that the op-amp open-loop gain is 2*10^5 and its supply voltage is Vcc=10V Homework Equations Vo= A(vp-vn) The Attempt at a...

Hello folks, This is my first post here, I hope I am posting my question in the correct place/manner? I am a mechanical engineering student taking an electrical class. We are studying op amps. The thing that is confusing me is current flow in the circuits. I understand that there is infinite...

Hello folks, This is my first post here, I hope I am posting my question in the correct place/manner? I am a mechanical engineering student taking an electrical class. We are studying op amps. The thing that is confusing me is current flow in the circuits. I understand that there is infinite...

Homework Statement Design a circuit containing a single op amp that can perform the following operation: Vo = 3*10^4(i2-i1), where i2 and i1 are input current sources Homework Equations The Attempt at a Solution Where I'm at right now, I am just using the equation for a difference...

Homework Statement I need help with finding an operational amplifier that could be cascaded with itself to produce a total gain of around 100,000, or 100dB. It also needs to be operational up to 1.5 MHz. This is for an rf amplifier for an AM radio I am building. Homework Equations...

Hello, I am wondering why the inverting terminal is the negative terminal and the non-inverting terminal is the positive terminal by name?

Making resonance using "simulated inductor" (op amp) I want to have a circuit that responds strongly (gives me a good measurable voltage) to a 10kHz sound input. To do this, I thought about hooking up a microphone and making a resonance circuit (using inductor and capacitor) to amplify the...

Hello everyone. I am studying internal structure of op amp and i don't know to solve some problems. The problem is that i have to specify and justify which inputs of the differential stage are inverting and non-inverting input and i don't know how to do it. I tried to find the answer on google...

I am working on a project that involves using an op-amp (among other ic's) to collect EMG signals from arm muscles. I couldn't get my hands on TL072. Will IC 741 be a decent substitute? TL072 -> http://www.ti.com/product/tl072 IC 741 -> http://www.ti.com/lit/ds/symlink/lm741.pdf...

Hello I'm a bit stuck on this. The question states that the non ideal op amp (pictured below) in open loop conditions has an input resistance of 400kΩ, an output resistance of 2kΩ and a voltage gain of 500,000. I then asks to find the voltage gain, the voltage at the negative input terminal...

Hi, I was just curious, I am no EE, I am an ME and I am trying to make something smaller if you have read my other posts you might know what's it all about, anyways I've been reading a lot about single supply op amps and that's probably the best choice to reduce the amount of power my circuit...

Op Amp -- what is the slew rate limitation? Hello i would like to what is the slew rate limitation?? and why it is good to have higher slew rate? thanks

Hello, I am trying to figure out the transfer function for an RC phase shifter: http://imgur.com/2dnRYn7 (Picture of circuit) I am not sure how to calculate the output and specifically the phase of the output of this circuit. I understand that I need to consider one of the 'golden rules'...

What is the equation for Vout of the integrator op-amp?

Hi In the waveform picture i attached, I don't know why the square wave is floating instead of being on the 0 of the x axis. I also attached schematic of the pwm circuit. By the way, this is a pulse width modulator circuit made of 4 op amps, U2D is a schmitt trigger to generate sqaure...

Homework Statement What exactly is op-amp saturation? Homework Equations V_{out}=A_{v}V_{in} The Attempt at a Solution I am doing a lab where we use an LM339A quad voltage comparator and a voltage divider network to create a voltmeter. A single red LED is connected to each of...

Homework Statement Derive the differential equation from the following circuit Homework Equations The solution needs to be a differential equation in standard form, so that I can solve the equation for the characteristic modes, zero-input response, zero-state response, etc. The...

I am in the middle of designing a low drift and low ripple power supply for myself. To control the output voltage, which ranges from 0 to 20V, I am using an op amp whose output is fed into a Darlington pair of power bjts. The output of the Darlington pair is both fed back to the op amp's...

Homework Statement Find Vo/Vin.I understand perfectly how to do this question. It simply involves an application of ohm's law to find i1, then KVL around the first loop. KCL at the top, and KVL around the second loop. Then to solve simultaneously. My issue however Is why the mechanics of...

Hello, I have been researching operational amplifiers because I plan on using some in a circuit I wish to build, but have been stuck for awhile on the concept of the maximum current that can be handled by the non-inverting input. It appears as though the input bias current is the current...

1. Homework Statement For this problem, the diagram of the circuit is attached. It was assigned to find the frequency response function of the circuit.2. Homework Equations E_o/E_i= -Zf/Zi3. The Attempt at a Solution I know for the top branch of the circuit, it has a negative feedback loop...

Homework Statement See attached picture. My objective is to calculate V0 on the 2k resistor. I'm used to seeing op amps that are more simple looking. I'm trying to reduce this op amp circuit to a simpler one (my attempt is the bottom picture). My question is: did I simplify the...

Homework Statement The OP amp in the circuit is ideal. Calculate V0 if Va = 2V and Vb = 1VHomework Equations V = IR KCL, KVL, voltage division, current division,Op-Amp Output V = (Gain)(V+ - V-)(Gain) = -Rf / Rin Ideal op amp properties: Input Resistance RI = ∞ Output Resistance Ro = 0...

I have single 741 op amps running as unity gain amps and they work fine but when I tried to use a quad 741 op amp (LM348n) with the same config as the single 741 (short the inverting input to the Vout), the results are not correct. Can anyone provide a chip id and wiring config for a quad 741...

Hi guys :smile: This question has been bugging me for a REALLY long time so thanks in advance for the help :biggrin:! Homework Statement Calculate the Hybrid Parameters for an inverting op amp shown below: https://www.dropbox.com/s/45mjldud2ar5pwg/invOpAmp.jpg And I need to get it...

I have attached the circuit of interest. The question is to find Vd (drop across diode as shown in the attached image). Sorry about the handwriting on there (those can be ignored). The answer was given to be Vd=-5V. I can't figure out how they got that answer. I don't feel there is...

I built an inverting op amp circuit on a circuit simulator and did a transient analysis on it. I set the gain such that I expected a clipped output, but to my surprise it got clipped at +9V and -9V instead of +10V and -10V, which were the voltages supplied to the op amp. So why would this be the...

Hi I am trying to create a circuit which i can use as a voltage controlled switch. I have 2 voltage inputs, ** A constant 3V source V1, ** A source which charges up to 3.5V and then slowly discharges V2. I would like to amalgamate both sources so as when V2 discharges...

Hello, I'm having problem understanding the output of the integrating op amp. https://www.dropbox.com/s/djpg0uhi465ot86/download2.png https://www.dropbox.com/s/djpg0uhi465ot86/download2.png https://www.dropbox.com/s/p9bp9tlyykhjtvf/download.png...

Homework Statement http://imageshack.us/a/img27/7043/homeworktest2prob5.jpg Find the load current IL (in microamperes) in the circuit.Homework Equations V = IR KCL, KVL, voltage division, current division,Op-Amp Output V = (Gain)(V+ - V-)(Gain) = -Rf / Rin The Attempt at a Solution I'm not...

Homework Equations I think I figured out the 1st question. The result I got is Vout=2*Vin+2V. Which means twice as big wave as the Vin and shifted with 2V. Is this enough or I have to write equations like 2nd -> Vout = 2*Vin+2V? or 2) 2kV/s is the same as 2V/ms, or 20V in 10ms 3) Vout...

Homework Statement Design a circuit based on the noninverting op-amp configuration that functions as a 1mA ac current source. Homework Equations Gain = Vout/Vin = 1 + R2/R1 The Attempt at a Solution I really don't know how to start.

I understand how to apply op amps, but one thing about op amps had bugged me for some time. I want to know what about an op amp in negative feedback forces both the posotive and negative inputs to be equal. And could your explanation be for both an inverting and non inverting op amp. Thanks! :)

Hi all, What is the configuration of the op amp in the attached file? The resistors is confusing me. Can someone enlighten me? Thanks alot!

I have a few power supply's of different voltages, but for convenience a.t.m. can I use +9 and it's -5, it has a ground of course too

Homework Statement Suppose you are given an ideal op amp, an ideal voltage source with voltage Vs, 5 resistors with resistance R, and one variable resistor whose resistance can be adjusts continuously between .2R and R. Use these components to design a circuit, assuming ideal op-amp behavior...

I have a temperature probe that I amplify with an OP amp and the circuit has to sit next to a video transmitter operating at 1280 MHz outputting ~ 800 mW of power. I can get the circuit about a meter from the transmitter if I absolutely have to but it is going to be in somewhat close...

Homework Statement I have to use the basic equivalent model of an op-amp to develop an expression for Vo from the given op-amp. I also have to simplify the expression by treating the given op-amp as an ideal op-amp. Homework Equations Vo=A(Vp-Vn) Vo=G*Vs The Attempt at a Solution...

Homework Statement Find V_{out} of this amplifier Homework Equations V_{out}=G_v(V_{in}+V_F)=G_v(V_{in}+B_vV_{out}) The Attempt at a Solution I have been stuck on this for a week. I really don't know where to start. Have read the chapter multiple times, tried to create it on...

Homework Statement Find Vo as a function of Vg and the open-loop gain A. Attempt I'm not sure what open-loop gain means. I redrew the circuit so it made more sense to me, but I'm still not getting it. It seems that Vo is the voltage across both RL and the 4k resistor. The...

Homework Statement Assume the op amp is ideal. Design the circuit such that Vo = Va + 2Vb + 3Vc The Attempt at a Solution Not sure how to go about this one. I started with \frac{V_a}{R_a}+\frac{V_b}{15k}+\frac{V_c}{R_c} = 0 since the op amp is ideal, the sum of the currents going into the...

Homework Statement http://www.wifstrand.se/Albert/stuff/p6.5-9.png I'm stuck with finding v_o1 (voltage over the 10kohm resistor when all sources but the 3 V source, which I've labeled v_1, is set to zero); seems like it should be really simple but I'm missing an equation. Homework...

Homework Statement Calculate Vout if a) I=1mA, R1=2.2kΩ, and R2=1kΩ; b) I=2A, R1=1.1Ω, and R2=8.5Ω. c) For each case, state whether the circuit is wired as a non-inverting or an inverting amplifier. NOTE: I is set to 1mA in the circuit below. Homework Equations Req=(R1*R2)/(R1+R2) V=IR...

Hi ! I want to amplify the output of my hall effect current transducer ( CSLA2CD ). The output of my hall effect sensor is 15.6mVac. And I used a dual rail op - amp to amplify this small ac voltage which the gain is 101 ( as shown in the schematic below ). I tried to simulate using multisim...

I'm still learning about this, but it seems that an RC circuit performs the same function as an op amp integrator (http://www.electronics-tutorials.ws/opamp/opamp_6.html). In other words, they both can be used as integrators/low pass filters. If this is true, why would anyone bother with an...

I am currently trying to measure an 80pF capacitor using 2 voltage follower op amps. I have them both powered by a set of 2 1.25V rechargable batteries. They are op amp type LMP7721 link: http://www.ti.com/product/lmp7721 . Each op amp is configured such that the voltage out terminal [end...

Is it possible to power the op amp in this diagram in this manner if it requires +18V and -18V? This doesn't seem valid to me, but I'm not sure why it's not exactly. Thanks