Electronics > Beginners

Microphone bandpass with unity gain design question.

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Richard Crowley:

--- Quote from: alexg on July 25, 2018, 03:23:23 am ---
--- Quote from: Richard Crowley on July 25, 2018, 03:00:52 am ---This appears to be completely contrary to your requirement that the "signal from mic remain not amplified".
"Rail-to-rail" implies amplification.  Unless your power rails are measured in micro-volts which of course is absurd.

--- End quote ---

Sorry, probably worded it wrong and used wrong terminology, in simple words what I want is to be able for microphone to swing all the way up to 3v as close as possible and down to 0v as close as possible if that makes sense.

--- End quote ---

No. You used exactly the right terminology.  However your requirements are impossible.  Since there are only microvolts of signal coming out of the microphone capsule, you will need to amplify the signal to produce a 3V peak-to-peak signal.

But it is equally curious why you think you need a 3V PP audio signal?  Virtually all audio gear typically uses internal signal levels around 1V PP. Mic-level (unamplified) signal level is impractical because of poor SNR (signal to noise ratio).  And 3V PP is also impractical because it wastes power boosting the signal to unnecessarily high voltage.

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