Op-amp Definition and 212 Threads

  1. B

    Solving Op-Amp with Feedback - Get Help Here!

    Hope someone might be able to help, if you look at the circuit attached. Why is the feedback of resistor and cap not being fed to ground? What purpose does this serve. I was thinking its probably to filter out unwanted high frequencies but unsure?? Thanks
  2. V

    CIRCUIT ANALYSIS: 8 Resistors, 1 IVS, 1 Differential Op-Amp - Find Vo

    Homework Statement The circuit below is a differential amplifier driven by a bridge, find V_0. http://img476.imageshack.us/img476/8827/chapter5problem48fi2.jpg Homework Equations KCL, v = i R, Ideal Op-Amp relationshipsThe Attempt at a Solution I added 4 voltage markers...
  3. N

    Optimizing Voltage Gain: Solving an Op-Amp Problem for R1 and R2

    Homework Statement Determine the values of R1 and R2 to acquire a voltage gain (Vo/Vi) ranging from 2 to 10. Homework Equations A_Vt = A_V1 * A_V2 The Attempt at a Solution I completely bombed this test question...even though my professor gave me a "hint". he said the first...
  4. N

    Calculate Output Voltage of Op-Amp Circuit

    Homework Statement Find the output voltage. a picture is attached giving all information. The Attempt at a Solution I'm new to op-amps, and I wasn't sure how to go about solving this. I thought it looked like an inverting op-amp but I wasn't sure. Since I wasn't sure, I tried to use...
  5. Omegatron

    Unwanted signal in an op-amp circuit (inductive pickup?)

    I've got a simple audio circuit that I wouldn't expect to have any signal coming out of it (the resistor at the input is a pot and is being grounded out). But the previous stage's signal is still coming through: http://img399.imageshack.us/img399/5804/opampinterferenceaz8.png * It's...
  6. S

    Why is the Input Current of Ideal Op-Amps Always Zero?

    Hi, I was wondering why is it that the input current for an ideal op-amp is always zero? They say that it is zero because of infinite impedence but where exactly is this impedence? Across the op-amp?
  7. Gokul43201

    Analyzing a Wien-Bridge Oscillator for Stability: Techniques and Tips

    I need to analyze a Wien-Bridge Oscillator for stability. Over the last day or so, I've taught myself to understand different op-amp circuits where I have well-defined V(in) and V(out). For the oscillator circuit though, there really is no such thing as V(in). There's a V(out) which evolves...
  8. electronic engineer

    Which Op-Amp Should You Use: Voltage or Current Amplifier?

    in most cases would we prefer voltage op-amp or current op-amp and why? when to use op-amp as voltage or current amplifier? thanks in advance
  9. S

    Op-Amp Inverting Configuration: Does Load Resistor Change Gain Equation?

    Hi Guys! well! im just a bit confused here. i want to ask you a question: just have a look at the fig below which i have posted. You can see a load resistor "RL". my question is that whenever i studied this inverting configuration of opAmp, there is no load resistor given for it...
  10. Q

    How to Design a High-Gain Discrete Op-Amp?

    Hi, my name is Quan and I am new to this forum. I am trying to build a discrete operational amplifier but I am very weak with circuit designing since my concentration is in communication. Anybody here have a lot of experience building analog op-amp circuits? If you are in the area then that's...
  11. F

    Op-Amp Integrator: Understand 10MOhm Feedback Resistor

    Hi, I was assigned a lab that requires me to build the attached circuit and show how the output signal is the integral of the input signal. Basically I can't understand what the function of the 10MOhm feedback resistor is. Its giving me a headache when I try to derive my proof for the...
  12. L

    Op-amp oscillator circuit - square, triangle, sine waveforms

    Does anyone know of any good oscillating circuits that are able to produce square, triangle, and sine waveforms (or any combination of these waveforms). The circuit that I'm constructing has to vary in frequency and is limited to using high-speed op-amps and other general components (resistors...
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