The output of a microphone is processed using a non-inverting amplifier. The amplifier incorporates an operational amplifier (op-amp).
State, by reference to the input and output signals, the function of a non-inverting amplifier.
The circuit for the microphone and amplifier is shown in the figure below.
The output potential difference 
is 
when the potential at point P is 
. Determine
the gain of the amplifier circuit
the resistance of resistor R.
For the circuit in the figure above:
suggest a suitable device to connect to the output such that the shape of the waveform of the sound received by the microphone may be examined.
state and explain the effect on the output potential difference of increasing the resistance of resistor R.
.
.
