The mic input has a signal and a ground. The signal line also outputs a 3V bias voltage supply, this is to supply power to some types of microphones needing this power. This is a very weak supply, provided through something like a 2.2k resistor.

For you to feed a signal into the microphone input, you can simply connect the output of your circuit (as long as it's output voltage is not too high, I haven't calculated the output voltage of your circuit) straight into the mic input. The OP amp has enough drive capability to sink the 3V bias voltage.

For good measure, you could add a coupling capacitor in series with the signal, then your OP amp won't need to sink the bias voltage supply.

You obviously need to supply the 9V power for your circuit from elsewhere.

The mic input has a signal and a ground. The signal line also outputs a 3 V bias voltage supply, to supply power to some types of microphones needing this power. This is a very weak supply, provided through something like a 2.2k resistor.

For you to feed a signal into the microphone input, you can simply connect the output of your circuit straight into the mic input (as long as it's output voltage is not too high - I haven't calculated the output voltage of your circuit). The op amp has enough drive capability to sink the 3 V bias voltage.

For good measure, you could add a coupling capacitor in series with the signal. Then your op amp won't need to sink the bias voltage supply.

You obviously need to supply the 9 V power for your circuit from elsewhere.