Switch structures for use on printed circuit boards

A printed circuit board (“PCB”) structure comprising:

• a main PCB structure having a first main surface opposite a second main surface, wherein the first main surface of the main PCB structure has electrical contact areas;
• a secondary PCB structure having a first main surface opposite a second main surface, wherein first and second electrically connected electrical contacts are disposed, respectively, on the first and second main surfaces of the secondary PCB structure;
• and
• anisotropic conductive adhesive (“ACA”) for physically and electrically connecting the second contact to one of the contact areas.

A dome switch structure on a printed circuit board (“PCB”) comprising:

• a main PCB structure having a first main surface opposite a second main surface, wherein the first main surface of the main PCB structure has first and second electrical contact areas;
• a secondary PCB structure having a first main surface opposite a second main surface, wherein the first main surface of the secondary PCB structure has first and second electrical contacts and the second main surface of the secondary PCB structure has third and forth electrical contacts, the first and third contacts being electrically connected to one another, and the second and fourth contacts being electrically connected to one another;
• anisotropic conductive adhesive (“ACA”) for physically and electrically connecting the third and fourth contacts to the first and second contact areas, respectively;
• and
• a metal dome disposed over the first contact and selectively depressable into contact with the first contact, the dome having an outer peripheral base portion that is in contact with the second contact.