Then the total gain is 10,000? It is too much.Today I modified the schematic & test the results. I made the following changes in sch:
i > set for both feedback resistors to 100 K
ii> input resistors to 1K in second op-amp.
An OPA134 opamp and the OPA2134 dual have very low noise, distortion of only 0.00008%, a full output bandwidth to 230kHz (the LM358 barely goes to only 2kHz) and works with a supply as low as 4V.I am looking for best audio quality op-amp.
Please do not say the word "noise" without describing the noise.I have checked with TL071 IC audio quality is good but getting noise.
No.If you look lifesize mic, they are using LM833 amplifier and LM2903 comparator and the audio quality is excellent. I think LM2903 using for echo cancellation.
Yes.its electronic hiss something like the sounds of radio (it's off or channel /FM signal is not available).
It is a switch maybe to turn an LED on and off.What could be the use of LM2903 in MIC from your point of view?
No.If you want to make low noise amplifier, you should use the filters on each stage's outputs.
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