Bit of a nitpick, but that's a short circuit across the power rails in edited post #3 and #4.

 

Do you need mean the virtual ground? The virtual ground gives the op amps the illusion of a dual tracking power supply.

 

Do you need mean the virtual ground? The virtual ground gives the op amps the illusion of a dual tracking power supply.

Oops! Sorry, I did not realize that it was a virtual ground. Circuit makes more sense now. Could not figure out why there were differing ground symbols.

 

One of my standard design features.

 

One of my standard design features.

That "virtual ground", which makes indeed an effective equal of a split power supply, is actually better than using a voltage divider and filter capacitors because the effective impedance of that source is the output of the op-amp used, quite low and independent of frequencies over a wide range.

 

We shall see. My next project is a Wien Bridge oscillator, which will put more load than I like on the virtual ground. However I have a try it and see approach to designing sometimes. AKA auditioning. As before I will try several op amps in the slot just to see how they work.