Ring (toroidal) cores made of powdered iron.
Purchase of one piece means purchasing one core described in the auction topic.
Product features:
cores with low permeability
closed magnetic circuit,
core covered with a layer of insulation increasing the safety properties of the finished element .
low tolerance Al=5%
Application:
class D audio amplifier chokes
resonant inductors f>,50kHz
power factor correction chokes f>,50kHz
Below is a list of cores made of -2 material available at other auctions