MMG India Pvt Limited offers Balun Cores for Transformers & Interference Suppression. MMG India Pvt Limited is an ISO - 9002 certified company. Balun Cores for Transformers & Interference Suppression was originally designed for balun transformers, matching balanced to unbalanced circuits in the television frequency spectrum. Balun Cores can also be used for wideband and pulse transformers and interference suppression. Multiaperture cores are designed as suppression components which are compact in size and provide high resistive impedance over a wide frequency band. These cores avoid the self resonance effects experienced with single aperture cores wound with multiple turns.