I don't quit understand the question. The + input to the opamp is a very high input impedance. The your V/2 reference delay was acting just as it was supposed to. Reducing the 0.47uf to 0.05uf would have sped up the charge time without suffering too much supply noise. Your 100k resistor makes the input impedance of your audio input, 100k ohms. In order for the opamp to provide optimum performance, the voltage at the + input must be V/2 exactly and actually both your inputs and output will be the same voltage otherwise the opamp isn't functioning or is defective. In measuring the voltages of the high impedance points (+in) you must use a scope or voltmeter with a very high input resistance otherwise you will see an erroneous voltage. You could just look at the output since it follows the + input. Rick Donovan Parks wrote: > Hello, > > I'm in need of some real world advice - the type of stuff they neglect to tell you in school. I am using an LM6132 op. amps > > > Thanks for any help or reference to information. > > Regards, > Donovan Parks > > -- -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics