I have plenty of TL071CPs lying around, and I am trying to make an amplifier with them. For the input stage, I am using an instrumentation amplifier with a gain of 5. In theory, this should provide pretty high CMRR and could result in a low-noise amplifier.
The input signal comes from my laptop. My power supply is ±12V, and the filter capacitor is not shown in the schematic.
But before I build it, will this work?
The input signal comes from my laptop. My power supply is ±12V, and the filter capacitor is not shown in the schematic.
But before I build it, will this work?
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Does your laptop have balanced outputs? If not, there's no point in using an inamp, CMRR doesn't apply in a single-ended setup.
Going balanced makes sense if you have a) very low level signals and/or very long signal cables and b) a very noisy (electrically speaking) environment and/or your signal cables laid out right alongside mains cables. That's why balanced connections are almost universally used in stages and recording studios, where you do have microphones, very long cables and lots of electrically active equipment.
Even if you had a situation where you actually needed a balanced connection in a home environment, just using an instrumentation amplifier as the input of your amp does not magically make the connection balanced, you would also need a single-ended to balanced converter at the output of your laptop. But, again, this is extremely unlikely to be necessary.
Even if you had a situation where you actually needed a balanced connection in a home environment, just using an instrumentation amplifier as the input of your amp does not magically make the connection balanced, you would also need a single-ended to balanced converter at the output of your laptop. But, again, this is extremely unlikely to be necessary.
