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Questions tagged [operational-amplifier]

Questions relating to the construction and applications of operational amplifiers, which are DC-coupled, high-gain electronic voltage amplifiers with a differential input and, usually, a single-ended output.

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5 votes
3 answers
6k views

Drawing a comparator op-amp in Multisim

I'm attempting to draw the following two circuits up in NI Multisim 10, to attempt simulation and confirm my calculations. However, I'm not sure how to represent the Vin and Vout sources. Also, ...
Claus Jørgensen's user avatar
3 votes
4 answers
1k views

Building a intermediate op-amp

I'd like to build a cheap and easy op-amp to use with my electric guitar. The op-amp should input from the guitar's jack and output to a standard "earphone's cable" jack ( not sure about the jargon ...
Stefan's user avatar
  • 249
8 votes
2 answers
3k views

Tiny, cheap audio buffer with mute?

I need to buffer an audio signal (feeding into a variable input impedance), and make it mutable with a digital control. The best thing I can think of is an op-amp (maybe TS971? 3×2 mm SOT23) feeding ...
endolith's user avatar
  • 28.8k
-2 votes
1 answer
714 views

Can I use an op-amp in buffer configuration as a voltage source? [closed]

I'm working on a scale project where I use an INA126 to get my signal. After the filters I need to subtract voltage from it. I'm using an op-amp in the appropriate configuration. It does this ...
user avatar
14 votes
3 answers
12k views

OpAmps - Single Supply or Dual?

I'm trying to pick an op-amp and I'm having trouble figuring out if the op-amp needs a positive and a negative power supply or if I can connect it to ground and the positive supply. What do I need to ...
Robert Deml's user avatar
  • 3,252
5 votes
4 answers
8k views

Configuring INA126 Instrumentation Amplifier for Data Acquisition

I have a TI INA126 (datasheet) instrumentation amplifier that I want to use to amplify a noisy, low-level signal from a fabric-based resistive stretch sensor. The resistance ranges for the fabric ...
14 votes
8 answers
3k views

RnD on an EEG, Help required, what op-amp?

this is my first post, and I need some help/advice finding the right integrated circuits. I'll start by describing the project background a bit. I've received a fellowship to develop an open source ...
Jim's user avatar
  • 3,385
6 votes
2 answers
1k views

Op-Amp Slew Rate Requirements

After looking over this question and the answers received, it prompted me to wonder: Given pulse signals generated by a uC, what kind of slew rate on an op-amp will you need to reproduce the waveform ...
J. Polfer's user avatar
  • 3,800
21 votes
11 answers
7k views

Op-amp tutorial for electronic noobs?

Can anyone point me to a tutorial for electronic noobs that explains how to use op-amps and what I can do with them, besides amplification?
Nikolaus Gradwohl's user avatar
8 votes
6 answers
3k views

How can I convert the output from a momentary switch to a pulse on push and a pulse on release?

The title pretty much says it all. I have an idea to try out involving a op-amp differentiator circuit and a diode bridge, but I am flying blind. Also I am trying to accomplish this without a micro-...
noise's user avatar
  • 161
8 votes
3 answers
8k views

Why the resistor in this op-amp circuit?

Here's a circuit diagram for a signal response test circuit from the spec sheet for a HA-5195 op amp and looks like a non-inverting amplifier circuit with a gain of 5, plus the 200Ω resistor between ...
Grumdrig's user avatar
  • 505

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