DC coupling

DC coupling refers to the configuration in an electronic circuit where direct current (DC) signals are allowed to pass through without any blocking or filtering. In a DC-coupled circuit, capacitors are either not present or have sufficient capacitance to minimize their impedance at DC. This allows the direct current component of the signal to pass through unimpeded. DC coupling is commonly found in applications where both AC and DC components of a signal are essential. For example, in audio amplifiers, this coupling may be used to preserve the low-frequency (bass) components of an audio signal while still allowing the passage of higher-frequency AC signals.