I'm trying to simulate a simple amplifier for an electret microphone, but having problems regarding the output level and virtual ground.
The circuit in Multisim is as follows:
What I'm having trouble understanding is:
- Why is the virtual ground at 3v and not 2.5v?
- Why is the output swing 3x larger than the input swing and not ~100x?
Also, here's a scope trace which may be useful: (input - orange (ch.A), output - red (ch.B))
Edit: Here are the currents in the feedback network: