Ceramic capacitors exhibit a lower equivalent series resistance (ESR) compared to electrolytic capacitors. As a result, the ceramic capacitor’s contribution to the total capacitance is minimal, but it plays a crucial role in determining the overall ESR. When comparing aspect ratios, it can be observed that electrolytic capacitors with taller cylindrical shapes and higher voltage […]

# Category: Capacitor

## Utilizing a Varactor Diode with 2 Terminals in a Circuit: Explained

Varactor diodes find their application in resonant circuits that necessitate voltage tuning or frequency control. Unlike conventional junction diodes, varactor diodes feature a depletion region that functions as a separator between the P and N material. The varactor diode is a unique type of P-N junction diode that has an uneven distribution of impurities in […]

## AC Circuit Capacitors: A Rephrased Discussion

The capacitor resists any alteration in the source voltage according to the standard capacitor equation, which states that Q = CV. As a result, the current through the capacitor is directly proportional to the rate of change of the applied voltage, as expressed by the equation I = C(dv/dt). When plotted against time, the capacitor […]

## Choosing the Appropriate Voltage Rating for Capacitors: A Guide

The reason behind the formulae’s application does not require knowledge of its explanation, which delves into complex magic and obscure physical properties. However, it seems to be connected to the higher dissipation factor at higher frequencies and the heightened probability of internal corona discharge as the material’s thickness (or “effective thickness” at different frequencies) increases. […]

## Identifying the Symbol Representing a Capacitor

The EIA practice in North America utilizes a parallel-line-and-curve symbol to represent non-polarized capacitors. In addition, they include a + polarity marker on the line side for polarized electrolytics. On the other hand, IEC/EN practice in Europe uses a two-line symbol for non-polarized capacitors and a line-and-box symbol with the box placed on the + […]

## Calculating the Voltage Drop Across a Capacitor: A Step-by-Step Guide

W C = C V 2 2The more energy stored by a given capacitor, the more voltage there must be across the capacitor. In fact, the energy stored by a capacitor is proportional to the square of the voltage across: W C = C V 2 2 where C is the capacitance. Solution 1: What […]

## Understanding the Functioning of a Capacitor in a Debouncing Circuit

Given that the logic low 0.8V level is significantly lower than the normal TTL logic high level at 2V, it is logical to conclude that R1+R2 would only increase the charge time and not the discharge time through R2. This phenomenon happens because, in a steady state, a capacitor blocks any current from DC voltages. […]

## Resonant frequency and Resistance relationship in a series RLC circuit: A Rephrased Analysis

The question suggests the existence of multiple resonant frequencies. So, what are the other resonant frequencies and how can they be deduced? simulate this circuit – Schematic created using CircuitLab Solution 1: A simulation can be used as one method to determine the resonant frequencies. Question: I have a series RLC circuit and I have […]

## Utilization of Non-Polarized Capacitors

Non-polarized capacitors are necessary in AC power feeds, and for safety purposes, they should be X or Y rated if connected to AC mains. When dealing with AC/RF signals that have no DC offset voltage, it is recommended to utilize non-polarized capacitors. Question: I have a great interest in capacitors, specifically the polarized capacitors type. […]

## Transform Circuit’s Capacitor Shorting: An Alternative Approach

It is important to select caps with a higher voltage rating in order to generate the necessary high voltages for sparking across a fixed gap. Question: I constructed the circuit depicted in the provided link using a voltage of 240 volts. The link provided directs you to a tutorial on how to create a power […]