(a(i))[1]
State the name of this amplifier type.
(a(ii))[1]
Show that the amplifier gain is $6.0$.
(a(iii))[2]
At $t = 0$, the input potential $V_{IN}$ is zero. $V_{IN}$ then rises steadily with time $t$ as illustrated in Fig. 7.2. On Fig. 7.2 sketch a line to represent how the output potential $V_{OUT}$ varies with time $t$ from $t = 0$ to $t = T$.
(a(iv))[1]
State how the circuit of Fig. 7.1 may be altered so that the amplifier gain depends on light intensity.
(b(i))[1]
An op-amp is to be used to switch on a high-voltage heater. State the name of the component used as the op-amp output device.
(b(ii))[3]
Complete Fig. 7.3 using the device named in (i) and a diode so that the heater can be switched on when the op-amp output is positive.