is a part of
a counter tube in which an ionizing event increases conductivity
is a part of
a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier
is a part of
a microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage
is a part of
a cartridge in which an output voltage is produced by the vibration of a piezoelectric crystal
is a type of (narrower)
an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system
"spare components for cars"; "a component or constituent element of a system"