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The core material is air, so it has low permeability hence lower inductance so, it can be used for high-frequency applications. Air Core Inductorīy taking a cylindrical material of specific diameter (like a drill bit) as a template, we can wrap around a length of wire to make an air-core inductor, further the inductance can be stabilized by dipping the inductor in varnish or securing it by wax. When compared with other core indictors these have very limited applications. These are applicable in audio equipment’s. These inductors have high power and high inductance value but limited in high frequency capacity. In the areas where low space inductors are in need then these iron core inductors are best option. IR Receiver Arduino Uno & IR Remote Decoder.Water Pump Auto on/off with Water Level Indicator.Rechargeable Wireless Mouse and Keyboard.Touch Switch Circuit Diagram Using IC555.Over Voltage Protection For AC Appliances.Visitor/People/Object Counter Circuit/Project.