Which operational amplifier should i use?

Thread Starter

d.akkas3

Joined Aug 3, 2022
12
I have a project it is desired to amplify AC signal.I decided to use Op-Amp. I 'll amplify the signal by 20 times. and searched ,looked opamp sheets but i 'm so confused . If u knew pls recommend opamp?Do u have any idea ? Thanks
 

ronsimpson

Joined Oct 7, 2019
2,246
What is the supply(s) voltages you have available?
How bit is the signal? Input X 20 = output
What frequency range? audio, video, RF?
What are you driving? Speaker, 50 homs, meter?
What is the input from?
 

ag-123

Joined Apr 28, 2017
259
here you go
https://www.allaboutcircuits.com/vi...ifier-configurations-non-inverting-amplifier/

\[ \frac{V_{out}}{V_{in}} = 1 + \frac{R_2}{R_1} \]

common numbers are:
LM741
LM148, LM248, LM348
LM358 (single supply) dual - may have cross-over distortion, single supply - may have trouble with A/C signal
LMV358 rail to rail single supply - may have trouble with A/C signal
TLC2272 Dual, Low-Noise, Rail-To-Rail Operational Amplifier - this one looks good (note output currents is low, check specs, rail-to-rail is given for 1mA output for 5v VDD, drawing more currents would likely pull the max Vout lower. these are ok if it is simply used as a buffer say to an ADC)

I think there are lots more better ones
https://blog.snapeda.com/2019/10/23/the-top-10-operational-amplifiers/
https://components101.com/articles/...s-and-selecting-one-for-your-next-application
https://en.wikipedia.org/wiki/List_of_LM-series_integrated_circuits
 
Last edited:

dl324

Joined Mar 30, 2015
14,897
I have a project it is desired to amplify AC signal.I decided to use Op-Amp. I 'll amplify the signal by 20 times. and searched ,looked opamp sheets but i 'm so confused .
Is this really homework? What is the input voltage and frequency range? What supply voltage(s)?
If u knew pls recommend opamp?Do u have any idea ?
Most of us prefer not to read text-speak. Please spell out the words and try to use proper punctuation.
 

Thread Starter

d.akkas3

Joined Aug 3, 2022
12
hi d.
Which OPA do you have on the bench.
Is your input signal DC or AC, tell us what the signal is.?:)
E
My signal is AC with dc offset 25 mv. Now i'm doing simulation on many draft (my project is adjustable gain briefly,switching nmos and noninverting amplifer combination ). I used OPA07 OP777 but signal is so osilated and overshoot .Thus if you have any suggestion i'll try it
 
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