Electrical noise, which effects the correct operation of electrical equipment, can originate from sources both external and internal to the product. For example, high frequency noise can be generated by the rotation of a brush motor. As a counter measure to such noise, a capacitor can be introduced into the noise prevention circuitry to lower the circuit impedance.
It is necessary to use a capacitor with excellent, high-frequency characteristics. This is why OKAYA uses metallized polyester film as the capacitor dielectric in all AC noise suppression capacitors.