The coupling capacitor is replaced on the input side of the circuit by the Miller capacitance " C M ", which draws the same current from the driver as the coupling capacitor in Figure 2A . Therefore, the driver sees exactly the same loading in both circuits.
12.
Each coupling capacitor along with the input electrical impedance of the next stage forms a high-pass filter and the sequence of filters results in a cumulative filter with a " 3reactance of each is at most a tenth of the input impedance of each stage, at the lowest frequency of interest.
13.
The large capacitance per unit volume of electrolytic capacitors make them valuable in relatively high-current and low-frequency electrical circuits, e . g . in power supply filters for decoupling unwanted AC components from DC power connections or as coupling capacitors in audio amplifiers, for passing or bypassing low-frequency signals and storing large amounts of energy.
