Questions tagged [capacitor]

A fundamental electronic component that stores energy in an electric field, commonly used in filtering applications.

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Small capacitor in series with battery pack - Why/how? [closed]

I have a device with a 12V battery pack (it's actually eight AA batteries in a harness.) In taking it apart, I see that it has a small capacitor in series with the positive side of the supply. So, ...
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Problem modeling capacitor bank for Three Phase Induction Motor

I'm currently working on a simulation in Simulink and I encountered a problem. I'm using a capacitor bank to improve the voltage drop at the output voltage of the motor. The problem is the capacitor ...
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Capacitor circuit - thinking about electrons

This is a very theoretical question, just for intuition. I have the following circuit: I would like you to focus on the flow and movement of a single electron when the switch is closed When the ...
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4 votes
2 answers
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Confusion In RC circuit

I want to calculate voltage across the resistor. I divided the circuit into two parts: Charging=0<t<1, 2<t<3, 5<t<6(ms)... Discharging=1<t<2,4<t<5,7<t<8(ms)... $$...
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Series and Parallel Capacitors in Circuit Analysis

In the circuit below: I performed my calculations considering: $$\frac1{C_{eq}}=\sum_{k=1}^N C_k^{-1},$$ and $$C_{eq}=\sum_{k=1}^N C_k,$$ when the capacitors are in series and when they are in ...
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4 votes
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Designing a common emitter audio pre-amplifier

I am trying to design and simulate a common emitter audio pre-amplifier using 2N2219 with characteristics based on industry standards (audio frequency response, etc. Corner frequency must be less than ...
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What are those components for? [closed]

So I have three different circuits and I need to purpose of some components in them Series resonant converter circuit. What is the purpose of Lr and Cr components ? Variable speed/light control of ...
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Purpose of components [closed]

These schemes are not related to each other. Can someone tell me the purpose of the Lr Cr components here? What is the purpose of the 39 ohm resistor and 0.01uF capacitor? What is this circuit used ...
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Distortion Pedal Design

I am building a guitar pedal and came across a reference design here: https://www.wamplerpedals.com/blog/uncategorized/2020/05/how-to-design-a-basic-overdrive-pedal-circuit/ I'm not sure why the ...
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Series capacitor not blocking DC voltage

In my understanding a series capacitor (with some resistance) works as a DC block, essentially forming a high-pass filter, blocking DC. Under this assumption, a unipolar square wave of amplitude V ...
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Does the conductivity or resistance change the capacitance value if I use other material for my capacitor plates?

Capacitance depends on surface area. Now I know copper is one of the most conductive materials and is great for capacitors. Steel is so much cheaper though and I can find a plate for the same size ...
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Monitor with Garbled Output During Cold Boot [closed]

For the longest time, I used this monitor (Asus VW266) as my primary display. However, recently this started happening as the display started up (from a being off during the night, or for longer than ...
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Can a non-electrolytic capacitor be made from activated carbon?

I’ve been seeing a lot of super capacitors made from activated carbon powder particles bonded together with a resin to form a solid plate. Activated carbon has a very high surface area that’s why it ...
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Why does the capacitance increase sharply here? [closed]

Why does the capacitance increase sharply here?
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To decouple or not to decouple these LEDs/drivers?

I am designing an aluminum PCB for some custom aquarium LEDs. I've done a lot of searching on mouser and read lots of data sheets for drivers that would suit my needs. Most of them have "typical ...
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1 answer
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How can I generate 1200 kV with a 15 kV 30 mA 60 hertz NST?

On a voltage multiplier it stopped working because of too many stages. If I rectified it then used a Marx generator would that work instead? I don't know if a Marx generator will stop working after a ...
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3 votes
2 answers
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Why is capacitor discharge time higher when an LED is included?

I'm testing the discharge time of a capacitor. I found that the time is higher when an LED is present. Circuit with a capacitance of 100mF, 10k resistance and 5V voltage. By calculating discharge ...
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What is the benefit of this capacitor?

As I know capacitor in DC circuit is not let current go through, and also it is just charging for a while and it becomes like open circuit, so what is the benefit of it?
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Current Direction and Voltage Polarity in Capacitor/Inductor Circuits

I believe that this question may be simple for those with a little more experience, but it is still puzzling me. Studying capacitance/inductance, I understand that the capacitor in the DC case behaves ...
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4 votes
1 answer
318 views

What is the meaning of temperature characteristics in capacitor datasheet?

I found a datasheet for a medium voltage ceramic capacitor in door knob form factor. I'm not familiar with one of the stated characteristics. Specifically, the temperature characteristics: +22/-33%....
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3 votes
4 answers
488 views

Problem with building -12/12 V power supply and AC/AC converter

At the beginning I wanted to point out that I don't know much about electronics and I'm just starting my adventure with it. I recently bought an AC/AC 12 V power supply and to my surprise, it showed ...
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8 answers
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Why is a capacitor considered a short circuit at start up?

The frequency response of a capacitor says a capacitor has a high impedance at low frequencies and it has a low impedance at high frequencies (up to the capacitor's resonant frequency.) If we use a ...
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Voltage drop protection [closed]

My circuit supplies 13V to a system, but one of the actions dropped that voltage to 9V. I need to implement a circuit that holds the initial voltage above 12V for at least 5 seconds. I thought about ...
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3 votes
3 answers
153 views

Measuring capacitance with STM32

I'm trying to measure capacitance with my STM32L053-Disco. I'm using the ADC and one output pin to charge the capacitor. I tried measuring the time it takes for the capacitor to charge to 62.3%. The ...
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-4 votes
3 answers
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Will this charge a capacitor?

Can this circuit charge a capacitor, or will it not work? To me, two diodes is enough for full wave bridge rectification if the cathode on the capacitor is grounded. I’m just trying to charge a ...
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2 votes
2 answers
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DC-DC booster functionality

I am working on a DC-DC booster. I have already built it, boosting 1.7 V to almost 18 V. I am using an IRF540N as my transistor, an inductor, a diode, and two capacitors. I was reading about how the ...
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Frequency dependence of capacitance

What is frequency when referring to the frequency dependence of capacitance? Whose frequency is being discussed?
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Need Help Identifying - Pentair pool automation motherboard

Hoping someone can help me identify the component in this picture. This is a Pentair pool automation motherboard - model number 520073. The top part of the photo shows what I believe is a capacitor ...
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Help me to understand the output signal of this circuit

I want to understand the output voltage of this circuit. My analysis is: When we are in the positive half of the wave, the capacitor will charge and the current will flow through D1 after it goes to ...
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Audio noise when transmitting radio packets using the ESP32

I am building a sort of walkie-talkie using an ESP32 WROOM chip. I use the internal ADC to sample the microphone and the internal DAC to power small headphones. This all works OK, not the highest ...
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Resistor in parallel across a capacitor

I was working through a problem involving two cascaded integrating op amps with feedback resistors with a DC step function as input. The book asks for the current flowing from the capacitor in the ...
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3 votes
2 answers
223 views

Why does the quality factor include 2*pi?

The quality factor is defined as the ratio of stored energy and dissipated energy (see below). The formula includes \$2\pi\$ as a constant coefficient. Why do we need \$2\pi\$ to calculate the stored ...
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3 votes
3 answers
715 views

How can failure of Class Y capacitors lead to electric shock?

This article mentions "Due to the fact that equipment cases are usually grounded, Y caps require higher safety to avoid risks of electrical shocks to users" How can an equipment with ...
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Question on RC circuit.(Texas Instruments interview)

I have confusion in this circuit. I know at t=0 both capacitor charges instantly. and voltage divided between both capacitors equally. but after some time output loop start active and capacitor C1 ...
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RC time delay circuit to trigger relay

I'm trying to design a circuit that uses a momentary switch/push button to turn on an LED, then it turns off after 1 sec if the switch is held in the ON position longer than that. Below is a diagram ...
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I designing a pulse generation circuit using capacitor and resistor but my output is not coming as expected

I am designing a pulse circuit which I will be feeding to a comparator. I am using a combination of resistor capacitor and diode for generating positive edge triggered pulse as shown in the below ...
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-1 votes
1 answer
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What capacitor is this (part number)? Looking for the datasheet [closed]

I'm trying to find the datasheet for this 1.0F & 5.5V capacitor. Some identifying labels on it are "GC", "Japan", and "822". I haven't had luck in my googling, so ...
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I need a chip tantalum capacitor c it has 107c 01JB1 on it

It goes in a 8A linear voltage regulator. It is a Chip tantalum capacitor c marks on it is 107C 01JB1 I do not know the value or rating of it or where to get one any help would be great.
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AC single-phase fan motor works (almost well) without start capacitor, but not with the correct capacitor connected?

I have a fan motor from a mobile a/c unit here which stopped working. It is for the fan that blows the warm/hot air trough the a/c condenser (exhaust air). 240V AC motor with a 4uF (+/-10%) 450V ...
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5 votes
6 answers
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Why can't current change instantaneously in a given inductor?

I know the mathematical reason behind this. Given the inductor I-V characteristic we know that: I understand mathematically that a function which is differentiable must be continuous, but what is the ...
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Feedback resistor and capacitor calculation for transimpedance amplifier

I am designing a transimpedance amplifier using LTC6268-10 from Analog Devices. The photodiode that I use is S9055-01 from Hamamatsu and the laser source that I use has a power of 10mW with the ...
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2 answers
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Can a bipolar capacitor in an AC circuit store even a tiny amount of energy? [closed]

I've been reading (some Q&As on here and other bits on the web) about the behaviour of bipolar capacitors in AC circuits. I understand that a polarised capacitor cannot work and will likely ...
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8 votes
2 answers
563 views

What is the purpose of the capacitor and diode in this fan driver circuit?

I have an FPGA dev board with a fan PWM circuit so that you can hook it up to a fan + heatsink. I happen to like this as we put a common heatsink together for the hottest components, and I drive it ...
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6 votes
4 answers
1k views

Tiny inductors and capacitors connected in parallel to a DC motor terminals

Why would you connect tiny resistors and capacitors in parallel to a DC motor as shown in the picture? Why would two of the resistors be connected to the outer shell of the motor? I checked the ...
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2 votes
1 answer
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Capacitor discharging after power supply is turned off

I am actually a computer engineer trying to get a feet into the embedded world starting by learning basic circuit stuff using 5 V or 3.3 V provided by Elegoo power supply. I built the following ...
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DC-link capacitor selection for electric vehicle

I'm currently trying to build a model of a three-phase inverter to be used in electric vehicles. The selection of a film DC-link capacitor is mainly dependent on the allowed voltage ripple, which is ...
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2 votes
1 answer
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What does "M" value mean for ceramic capacitors like: 226M 473M 107M?

For example: 22uF 16V 226M 47uF 10V 476K What does this last specification mean?
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2 votes
3 answers
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Placement of a decoupling capacitor

I am using the CD4046, and trying to put a decoupling capacitor on it. However, the power pin is on the literal opposite side of the power pin, like so. As you can see, I have a decoupling capacitor, ...
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1 vote
3 answers
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Help resoldering SMD capacitor

I was cleaning my 1080 and installing new thermal pads when I accidently broke off a capacitor during disassembly. Does anyone have experience resoldering SMD capacitors on GPUs and if so what solder ...
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-1 votes
1 answer
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Discharging a capacitor into another capacitor via inductor

What would happen if you connect a charged capacitor (charged to V voltage) with another capacitor of same rating via inductor. What would happen ? Will both capacitors will have same voltage and if ...
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