what is a bypass capacitor used for
The function of the bypass capacitor is to dampen the AC, or the noise. Another term used for the bypass capacitor is a filter cap. In the chart on the left, you can see the what happens to a noisy voltage when a by-pass capacitor is installed.ou can see even with the bypass, the voltage does fluctuate, even though it is to a smaller degree. The key function of the bypass capacitor is to reduce the amount of ripple in a circuit. Too much ripple is bad, and can lead to failure of the circuit.