David Looser wrote:

Simply the star point is connected to the inverting input of the
op-amp, the non-inverting input being at AC ground. A feedback
resistor connects the output of the op-amp to the star point.


Thanks for responding.

Yes, that was how I was doing it. However, when I added a second virtual
ground op-amp the audio was killed completely at the outputs of both of the
virtual ground op-amps. Is there something I'm missing here ? Is it possible
to connect two virtual grounds together at a star point ?

Also, is the virtual ground idea going to eliminate the problem of level
changes as the fan-in/fan-out numbers change ?


There is, however, a potential problem with your distributed "star
point". If the capacitance to ground is too high you may get
instability in the virtual ground op-amp.


OK, noted. I haven't got that far yet.