Step 4: Wire the circuit on the bread board.
Analog input is for the microphone, and Digital Output(PWM) for the servo motor.
The mic module needs the power at Vcc(3.3V) from arduino's Vcc pin.
The servo motor requires 5 to 6V to be driven, so you connect the battery power to it.
What is the capacitor into VCC and GND? Because I have been suffered from the noise of microphone. The combination of the ECM module by Sparkfun and Arduino seems to be unstable. For instance, when I wrote serial communication code to monitor A/D value, it cause enormous noise and the A/D value keeps high. So the capacitor is to ease my mind.