I'm pretty inexperienced in EE, but I'm adapting the circuit given in this question to amplify microphone inputs to drive an ADC.
I am going to be driving 4 ADC channels (on a Beaglebone Black) from 4 microphones, so I'm planning to use a quad op-amp.
The upper left of the circuit is a voltage divider providing bias voltage, with a 1MΩ resistor R3 isolating it.
My naive question is this: How much of the bias voltage circuit do I have to replicate per-channel? Can I drive all four channels from the node at the right of a single copy of R3?