Op-amp Definition and 217 Threads

Hi, I'm currently making a hydrophone and I'm planning to use a piezo crystal as a sound receiver whose output I then intend to put through an op-amp. Berkeman recently raised an interesting point about voltage issues with op-amps so I thought I'd pose this question before proceeding any...

Hi, My shiny new op-amp arrived today for my hydrophone project. Great. Only problem is it's difficult to actually see it, it's so small. The pins are barely a millimeter apart and obviously I can't solder anything that small. So is it possible to get harnesses which increase the size of the...

Homework Statement Hey guys, quick EE question for ya. This is the end of a signals and noise assignment and i think I've got it but I am not sure so i thought id check. Attached is the question, doing the 2nd part of 13 The part that isn't shown that we need is that the band pass is between...

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

Hi, I am having trouble filling out the nodal equation for the node of the first op-amp towards the left. Let's say that node voltage is Vx. (V-) I know that, Vx - 5 / 70k + ~~~~ = 0... I don't know what to put for the ~~~~ part. I know the current has to equal the current across teh 70kohm...

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...

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...

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...

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...

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?

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...

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

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...

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...

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...

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...

i know that output impedance of an op-amp is very small compared to its input impedance. is there any purpose of having a high input impedance and small output impedance?