davidsh
Headphoneus Supremus
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- Oct 4, 2012
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From another thread:
Can anyone elaborate? As I see it the capacitance of the diaphragm must one of the determining factors of sensitivity.
Quote:Hi davidsh,
When you want to change the efficiency of the electrostats, you either change the bias voltage or the spacer thickness. The capacitance on the film has nothing to do with the efficiency.
What you want to achieve when coating the diaphragm is that you want it to be conductive and hold the charge for as long as possible. The coating materials that I recommended in my earlier posts will give the resistance of around 10-100 M ohm per square. Think of the diaphragm as a capacitor and the coating as a bleeding resistor connecting on it. The bleeding resistor slowly bleeds away the charge.
Wachara C.
What puts me off is that coloumbs law states that the force exerted on a static object in an electric field depends on the charge of the object and the magnitude of the electric field (the electric field depends on spacer thickness and the voltage potential between the stators).
The charge that the diaphragm will hold is dependent on the capacitance of the diaphragm as well as bias voltage as I see it. In other words the number of electrons that you can stuff onto the diaphragm.
More charge = more electrons = more capacitance and voltage = greater force
Can anyone elaborate? As I see it the capacitance of the diaphragm must one of the determining factors of sensitivity.