If the bias voltage is not near half the supply voltage then the output cannot swing equally up and down and will be severely distorted (it will be rectified).So the bias voltage i have to do nothing with it , on some other schemes they put it to ground.... is this ok?
An opamp has a voltage gain of 50 thousand to millions at DC and low frequencies without negative feedback. Negative feedback reduces the gain, reduces distortion and makes the output an extremely low impedance.Also i have a question about inverting opamp....
Some schemes do invert ,others do not (positive to signal , negative to ground)
What's the reason , is it dependend of the used opamp or what you want to do with it?
The bias voltage is a reference voltage for the opamp that is usually half the supply voltage so the output can swing equally up and down. If the power supply is positive and negative then half the supply voltage is 0V which is ground.
If R3 is 100k and R1 or R2 is also 100k then the gain of that input is 1. Of an input resistor is 10k then the gain of that input is 10.
The power supply voltage of an opamp is not its input voltage. You suggested the opamp AD8656ARZ that shows an absolute maximum allowed supply voltage of 5.5V and all spec's are shown with a supply of 5V on its datasheet. If you use a supply of 9V or 12V then that opamp will be destroyed. Many other good audio opamps work from a supply voltage as high as 36V.
An OPA134 audio opamp works from a supply that is from 5V to 36V.
The 100k resistor values are high enough that an opamp will not be overloaded by driving them when the output level is very high.
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