Thanks for this.
I shall pop your figures into my simulator and let you know how I get on and also match your figures with what I come up with (its the only way the penny drops), 3 questions occur to me though:
1. for a microphone of 3.3k, what kind of input impedence would you expect an amplifier of this design to have, and knowing its input impedence what output impedence (for the next stage)?
2. I suppose I should be asking this later on (or in another thread) , the output in your last snapshot equates to 1.5mA @ 6v, is this enough current to drive a speaker, or is this a seperate topic worthy of another thread?
3. Whats the capacitor doing? I can see by your diagram it has contributed to the increased gain with a lower impedence on the input and output, how is it doing that? (pretty cool anyway)
In my previous post I quoted an input impedence of 5-10 times of source impedence (3.3k) which is 16,500 - 33,000 - your last snapshot demonstrates an input impedence of 14.5k, is this close enough?
Once again, many thanks.