An aerosol-generating device comprising: an electrical power source; an electrical heater; and a power control circuit connected between the electrical power source and the electrical heater wherein the power control circuit is an analogue circuit, the power control circuit comprising: a power measuring unit configured to determine a power supplied to the electrical heater from the electrical power source and to output a power measurement voltage proportional to the power supplied to the electrical heater; a voltage comparator connected to the power measuring unit and configured to output a voltage difference signal based on a difference between the power measurement voltage and a reference voltage (V ref); and a power regulator connected between the electrical power source and the electrical heater and responsive to the voltage difference signal, the power regulator configured to adjust the current or voltage supplied to the electrical heater in order to return the voltage difference signal to within a predetermined range or in order to minimise the voltage difference signal wherein the power measuring unit, the voltage comparator and power regulator are all implemented using analogue circuit components. an electrical power source; an electrical heater; and a power control circuit connected between the electrical power source and the electrical heater wherein the power control circuit is an analogue circuit, the power control circuit comprising: a power measuring unit configured to determine a power supplied to the electrical heater from the electrical power source and to output a power measurement voltage proportional to the power supplied to the electrical heater; a voltage comparator connected to the power measuring unit and configured to output a voltage difference signal based on a difference between the power measurement voltage and a reference voltage (V ref); and a power regulator connected between the electrical power source and the electrical heater and responsive to the voltage difference signal, the power regulator configured to adjust the current or voltage supplied to the electrical heater in order to return the voltage difference signal to within a predetermined range or in order to minimise the voltage difference signal wherein the power measuring unit, the voltage comparator and power regulator are all implemented using analogue circuit components. a power measuring unit configured to determine a power supplied to the electrical heater from the electrical power source and to output a power measurement voltage proportional to the power supplied to the electrical heater; a voltage comparator connected to the power measuring unit and configured to output a voltage difference signal based on a difference between the power measurement voltage and a reference voltage (V ref); and a power regulator connected between the electrical power source and the electrical heater and responsive to the voltage difference signal, the power regulator configured to adjust the current or voltage supplied to the electrical heater in order to return the voltage difference signal to within a predetermined range or in order to minimise the voltage difference signal wherein the power measuring unit, the voltage comparator and power regulator are all implemented using analogue circuit components.