Hello i make little experiment with old computer speakers wich they're powered by 220v->7v ac little transformer. As i know from many times ago one friend tells me for what are they do ceramic capacitors in cassette deck before big electrolyte capacitors cutting high frequencies from 50hz ac buzz. Before in parallel instead ceramic capacitor, i'd use 470uf/16v and after it 1000uf/25v the buzz from transformer its suppressing but why ceramic capacitor doesn't do like this 470uf/16v?! The op-amp is 2822m 2x1w i believe that is feeding with 12v Dc of these capacitors
