What is an Electrostatic transducer?
A. The electrostatic transducer is similar to an electrical capacitor, with one fixed plate and one movable plate. The fixed plate is an Aluminum disk with concentric groves on one side. The movable plate is a film of Kapton material coated on one side with a thin layer of Gold, which is stretched over the Aluminum backplate. The Kapton material acts as an insulator between the Gold and Aluminum. When an electrical potential, a 50 kHz drive signal, is placed between the two plates, the foil is attracted to the backplate. The moving foil displaces air and generates a burst of ultrasonic sound.
