Coils used in power circuits are termed RFC, Radio Frequency Chokes, or Chokes for slang.
They function by blocking AC and passing DC. The number of turns is a design characteristic to allow them to block noisy AC (interference) while passing the desired (resonant) AC frequency. Here's a few calculators that will assist you in determining what frequency a coil will operate at:
Radio Calculators
The windings are enameled copper, I see no design requirement for them to be gold.
Steve
They function by blocking AC and passing DC. The number of turns is a design characteristic to allow them to block noisy AC (interference) while passing the desired (resonant) AC frequency. Here's a few calculators that will assist you in determining what frequency a coil will operate at:
Radio Calculators
The windings are enameled copper, I see no design requirement for them to be gold.
Steve
