In electronics,
direct coupling or
DC coupling (also called
conductive coupling) is the transfer of electrical
energy by means of physical contact via a conductive medium, in contrast to
inductive coupling and
capacitive coupling. It is a way of interconnecting two circuits such that, in addition to transferring the AC signal (or information), the first stage also provides
DC bias to the next. Thus, there is no need for a DC blocking capacitor to be used in order to interconnect the circuits. Conductive coupling passes the full spectrum of
frequencies including
direct current.