Filter assemblies

摘要

A filtered connector 1 has an outer metal shell 13 within which extend several electrical contacts 26 to 28. Primary capacitors 30 to 32 of tubular shape have their inner plates electrically connected to the contacts. The primary capacitors extend through holes in a metal board 33 to which their outer plates are electrically connected. The board 33 is insulated from the outer shell 13 of the connector apart from a single secondary capacitor 40 connected between the board and the shell. The secondary capacitor 40 is larger than the primary capacitors 30 to 32, so that it is capable of withstanding higher voltages, but it has a lower value of capacitance. <MATH>