Choke coils are inductances that isolate AC frequency currents from certain areas of a radio circuit. Chokes depend upon the property of self-inductance for their operation. They are used to block alternating current while passing direct current. Below is a list of choke coil suppliers.

• Gowanda
• Wilco
• API Delevan
• AVX
• Coilcraft
• Murata Electronics
• Pico Electronics
• Prem Magnetics, Inc.
• Sprague Goodman
• Inductors, Inc.
• I-Tech