Current compensated choke coil kits white label ef42 1 this 220nh 1 chamber high quality choke coil kit is ideal for a wide range of applications such as resonant circuit coils inductors transformers and electronic ballasts in power supply and lighting circuits the ferrite core halves fit together congruently and are bonded with a two component adhesive the a sub l sub value can be reduced by inserts placed between the core halves white label ef42 1 choke coil kit 220nh