/sci/ - Science & Math » Thread #11257246

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Basic Operational Amplifier Problem

Anonymous Fri 27 Dec 15:08:52 2019 No.11257246 View Reply Original Report

Quoted By: >>11257254

Hello,

Simulink gives me 13.118 V as Vout but I don't know how to calculate this. Can somebody help? There's no feedback resistance.

Anonymous

Anonymous Fri 27 Dec 2019 15:13:14 No.11257254 Report

Quoted By: >>11257263

>>11257246
V_2=V_3
apply Kirchhoff's loop and junction rules

Anonymous

Anonymous Fri 27 Dec 2019 15:19:24 No.11257262 Report

Quoted By: >>11257265 >>11257276

there is no feedback loop so it works as a comparator. the non-inverting pin has a higher potential than the inverting input. thus the output gives the highest potential it can. it`s no rail-to-rail amp but it`s doing its best. are you?

Anonymous

Anonymous Fri 27 Dec 2019 15:19:50 No.11257263 Report

Quoted By:

>>11257254
You can't find V0 from there. Also, don't I need a Rf to find V0?

Anonymous

Anonymous Fri 27 Dec 2019 15:20:57 No.11257265 Report

Quoted By:

>>11257262
processing

Anonymous

Anonymous Fri 27 Dec 2019 15:27:20 No.11257276 Report

Quoted By:

>>11257262
Got it, thank you so much.

Anonymous

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Anonymous Fri 27 Dec 2019 16:57:36 No.11257442 Report

Quoted By: >>11257589 >>11257621

I have another question:
It's a basic summing amplifier, as non-inverting pin has no potential we don't need to use superposition. V0 should be -4 Volts but oscilloscope shows -765.795 mV. What am I doing wrong?

Anonymous

Anonymous Fri 27 Dec 2019 18:24:56 No.11257589 Report

Quoted By:

>>11257442
is your amp powered by Free Energy? /x/ is on their way.

Anonymous

Anonymous Fri 27 Dec 2019 18:36:56 No.11257621 Report

Quoted By:

>>11257442
>no supply voltage
Well, that's not so unusual.

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