The purpose of passive band pass filters is to filter or isolate particular frequencies within a given band. As a result, undesired frequencies outside of the intended range can be attenuated while the right frequencies can flow through selectively. As was previously noted, a non-polarized capacitor and a single series resistor may be used to accurately […]
Formulas
Understanding Passive High Pass Filter with Formulas
As we already know, a low-pass filter selectively permits signals with frequencies lower than its cutoff frequency fc to pass through. This shows that although the high-frequency elements of the input signal are attenuated (weakened), the lower-frequency elements are retained in the output. A passive high-pass filter, on the other hand, functions in the opposite […]
Understanding Capacitive Reactance with Formulas
Capacitors have a special way of opposing alternating current (AC) which is called capacitive reactance. This is like an internal resistance in the capacitor which changes based on the frequency of the electricity flowing through it. Unlike normal resistance which stays the same, no matter how fast the electricity changes (frequency), capacitive reactance is affected […]
Understanding Inductive Voltage Divider Circuits with Formulas
In many electrical circuits, inductive voltage dividers serve an important function in dividing an alternating current voltage source into smaller, more controllable voltages. The inductors in these circuits function by continuously resisting fluctuations in current. Inductors’ ability to effectively split voltage comes from this feature. We can build an inductive voltage divider in different ways. […]
Understanding Capacitive Voltage Divider Circuits with Formulas
Capacitive voltage dividers are circuits, which employ capacitors in series with an alternating current (AC) power supply to produce a voltage drop across each capacitor. The most common use for these circuits is, to safely decrease extremely high voltages for measurements or protection. High frequency capacitive voltage dividers are increasingly being used in touchscreens and […]