Coupling Capacitors

Coupling Capacitors

Coupling capacitors are electronic components that are used to transmit AC signals from one circuit to another while blocking DC signals. They are also known as AC coupling capacitors or signal coupling capacitors. These capacitors are commonly used in audio amplifiers, radio receivers, and other electronic devices where it is necessary to transmit an AC signal without any DC bias. Coupling capacitors work by allowing AC signals to pass through while blocking DC signals. They are placed in series with the signal path and are designed to have a high impedance at DC frequencies, effectively blocking any DC voltage from passing through. At AC frequencies, however, the impedance of the capacitor decreases, allowing the AC signal to pass through. The value of the coupling capacitor is important in determining the frequency response of the circuit. A larger capacitor will allow lower frequencies to pass through, while a smaller capacitor will block lower frequencies and allow higher frequencies to pass through. The choice of capacitor value will depend on the specific application and the desired frequency response. In addition to their use in audio amplifiers and radio receivers, coupling capacitors are also commonly used in power supplies to block any AC ripple voltage that may be present. They are also used in high-voltage applications to isolate one circuit from another, preventing any unwanted electrical interference.

AC coupling, signal, impedance, frequency response, power supply

— Andrew Smith

CITATION : "Andrew Smith. 'Coupling Capacitors.' Design+Encyclopedia. https://design-encyclopedia.com/define/coupling-capacitors?E=312012 (Accessed on October 13, 2026)"