Why Use High Voltage Coupling Capacitor for Input?
Reduces DC Noise in Amplifiers High voltage coupling capacitors, placed at the input of an amplifier stage, blocks DC current from entering that stage. This prevents the DC current from one stage, from being amplified in the next stage, reducing DC noise. Reduces Failures in Amplifiers and Power Supplies Excessive DC currents and high voltage can overheat and destroy a capacitor in a matter of seconds. If this current gets past the input capacitor, it will destroy the next stage of an amplifier or power supply. By using very high voltage coupling capacitors, it’s possible to reduce and minimize the affects of these types of failures. Lightning strikes on a power grid during an electrical storm is one situation where a high voltage DC current is introduced into system. Reduces the Start up Effects of Large Inductive Loads Large inductive loads such as electric motors draw heavy currents during their initial start up. The inductance of the motor tries to resist the new current flow being
