first and second capacitor plates arranged in parallel spaced apart a given distance from each other;

a flexure plate mounted in between said first and second capacitor plates and capable of flexing in response to acceleration forces applied thereon, said flexure plate having a first side facing said first capacitor plate for forming a first capacitor generating a first capacitance signal based on its distance from said first capacitor plate, and having a second side facing said second capacitor plate for forming a second capacitor generating a second capacitance signal based on its distance from said second capacitor plate, and said flexure plate having a null position between said first and second capacitor plates at which the first and second capacitance signals are equal;

a capacitance measuring circuit for measuring the first and second capacitance signals and detecting a difference between them as an indicator of offset of said flexure plate from its null position to a flexed position under acceleration forces;

a magnet coupled to said flexure plate between said first and second capacitor plates, and a current-controlled coil having a single windings receiving a single control current for generating a magnetic force opposing the magnetic field of the magnet when said flexure plate is in a flexed position so as to restore said flexure plate to its null position; and

a compensation circuit for generating a single control current in response to the difference between the first and second capacitance signals measured by said capacitance measuring circuit and for applying the corresponding single control current to said coil so as to restore said flexure plate to its null position.