ZYX-J30 12/24V 8A Battery Charger CE EM Modification

Dreadful Radiated and Conducted EM interference from this product so we fit the filter components and see if they make a difference. Component info: Blue caps can be any value from 47 to 150nF at above 250V AC Class X1. The ceramic disc capacitor capacitor between 0V AC and the Secondary side (This conducts RF noise back to the low impedance of the mains supply) on failure of the capacitor between the mains supply and mains earth would mean a short to earth, (equivalent to a failure of "basic" insulation). ... These capacitors are known as "Y capacitors" (X capacitors on the other hand are used between mains live and mains neutral). A suitable cap for this position would be Vishay VY1222M43Y5UC63V0 or similar. Any suitably sized common mode rejection choke will do.