Circuit assembly, method thereof and apparatus

A method of a circuit assembly, comprising:

• providing a transmitter coil and a plurality of receiver coils for receiving signals induced by a magnetic field generated by the transmitter coil;
• and
• providing one or more movable metallic targets for influencing the signals that are picked up by the plurality of receiver coils,
• wherein the plurality of receiver coils comprise a first receiver coil which is a sine-signal-output receiver coil and a second receiver coil which is a cosine-signal-output receiver coil;
• and
• wherein the method further comprises:
• displacing the transmitter coil and the first and second receiver coils from each other to have an open area in which the transmitter coil is present but not the first and second receiver coils, the open area having a predetermined range along a movement path of a first target, such that when the first target moves within the predetermined range, the circuit assembly is operable in a first mode as a low power on-off switch;
• otherwise the circuit assembly is operable in a second mode as an inductive position sensor.