Since most solid state, so called gyros, if not all use a capacitor
bridge circuit to sense acceleration and this is how they work.

The mass is seeing the one G acceleration force due to gavity
and is deflected downward. That means the spacing between the plates
of C1 gets larger and the spacing of C2 gets smaller.

As the spacing of the plates of a capacitor get larger
the capacitance is reduced. When the spacing gets smaller
the capacitance is increased.

Think of a capacitor as a variable resisters for waves.

There is an oscillator that supplies a constant amplitude  sine wave to the device.

The amplitude of the wave coming out of this circuit will
then be proportional to the number of G's the mechanical circuit is subjected
too.

Very high frequencies are used as these capacitors are tiny to say the least.
The basic capacitance is on the order of only one pico farad.

The wave amplitude coming out can be rectified or converted to DC and
then fed to an A to D for computer input. Use four of them
mounted equally spaced in a circle and you have a angular rate sensor.

This is an extremely simple idea and it is easy to make.
One can make their own, in any shop, using nothing but hand tools,
vastly scaled up from what one finds in a MEMS chip.

Paul Lamar