Hello,
I am new to this forum and, more in general, to the world of electronics. This is the very first time I am trying to build a small circuit because I have read that one can turn the sound card of a PC into a small oscilloscope. In order to screen the card from over-voltage or amplify the signal I need this small circuit that I have found some time ago over the internet, but now I have lost the site address and all I am left with are this and my notes.
Before attempting the assembling, I would like to simulate it with Qucs 0.0.15 (I use Ubuntu).
This is the circuit as I think might look in reality (without the switches S1 and S2 that I don't need to simulate).
The problem I think lies in the OPAMP alimentation. If I strip the capacitors C2 and C3 away the simulated behavior is what I would expect, but with that capacitor the output voltage is killed at high frequences.
My question is:
OPAMP Datasheet
I am new to this forum and, more in general, to the world of electronics. This is the very first time I am trying to build a small circuit because I have read that one can turn the sound card of a PC into a small oscilloscope. In order to screen the card from over-voltage or amplify the signal I need this small circuit that I have found some time ago over the internet, but now I have lost the site address and all I am left with are this and my notes.
Before attempting the assembling, I would like to simulate it with Qucs 0.0.15 (I use Ubuntu).
This is the circuit as I think might look in reality (without the switches S1 and S2 that I don't need to simulate).
The problem I think lies in the OPAMP alimentation. If I strip the capacitors C2 and C3 away the simulated behavior is what I would expect, but with that capacitor the output voltage is killed at high frequences.
My question is:
- how do I supply power correctly to the OPAMP?
- Where do I have to put the capacitors C2 and C3 showed in the paper schematics?
OPAMP Datasheet
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