I found this YouTube video and tried the setup in one of the videos.
The setup calls for a small pc mic, a headphone set, two 9V batteries and everything else shown here but I get no sound from the mic. Im not sure why, but Im reading the voltage between ground and the 9V+ rail and I get 15.50 instead of +9V. I'm not sure why I would get 15.50V.
Your explanation was too complicated for me to understand.
I was just trying to make use of what I have.
I need to read up on what a rail to rail amp is first and how to find out when an opamp is such.
I just checked the Vout on the amp and I get -6v to about 9v depending on where the pot wiper is.
One more thing, what is a pre-amplifier?
I'm looking at the data sheet but what parameter do I need to look for regarding the output current?
On your diagram, it shows Vcc- as being -9V. the potential between Vcc+ and Vcc- is 18 volts. Given that your op-amp is not rail to rail, your measurement of 15.5 volts seems entirely reasonable.
Rail to rail means the output of the op-amp can be set to be a fraction of a volt of each rail.