I am working on building some large inductors with 24 gauge wire, I need to find a core material that will work for audio frequencies.I need a material that will greatly increase the inductance (high permeability) as I don't want to have to use a thousand feet of wire to get the inductance I'm looking for.What can be used for a core in an audio frequency inductor?
Use the solenoid self inductance formula - L ((permeability)* (turns)^2)*(area) /(length) Look it up in any Physics II textbook or Electromagnetism text. Or at least try 'inductance' in Wikipedia. The wire should be enamel insulated (typically looks amber or red), then it's OK for the windings to touch. Otherwise, they partially short each other out. You definitely want to get the windings as close together as possible. Also what you wind it on is very important. Choose a soft (low remanence) magnetic material with high permeability for the most compact inductor. Ferrite is typical. Cast iron is very good. Permalloy is nearly ideal.
