(a)[2]
State, with reference to the input and output signals, what a non-inverting amplifier does.
(b(i))[1]
In Fig. 7.1, the circuit for the microphone and amplifier is shown. When the potential at point $P$ is $84\,\text{mV}$, the output potential difference $V_{\text{OUT}}$ is $2.6\,\text{V}$. Determine the gain of the amplifier circuit.
(b(ii))[2]
Determine the resistance value of resistor $R$.
(c(i))[1]
For the circuit in Fig. 7.1, suggest a suitable device to attach to the output so that the waveform shape of the sound collected by the microphone can be inspected.
(c(ii))[2]
State and explain the effect on the output potential difference $V_{\text{OUT}}$ when the resistance of resistor $R$ is increased.