Questions tagged [capacitor]

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

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Current through Resistor, Diode and Capacitor in Series

I have the following circuit consisting of a Resistor, a Diode and a Capacitor all connected in Series. (The exact values are not relevant to me). Ultimately I would like to have a formula describing ...
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Replacing capacitor [closed]

I replaced a 15 uF 500 V capacitor with an electrolytic 450 μF 250 V in an electric motor (cooling fan). Initially the problem fixed but after 10 minutes of working I smell somethιng burning from the ...
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12VDC 3500mA filtering, what are voltage regulators and capacitor values

I have a 12VDC 3500mA power supply and I would like to filter the outgoing voltage from any noise. My plan is a simple scheme: output from the power supply -> capacitor -> voltage regulator ->...
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ESR of aluminum electrolytic capacitors

Is there any way to calculate the ESR of electrolytic capacitors for high frequencies? In aluminum electrolytic capacitor datasheets, the dissipation factor is given with low frequency(100Hz-120Hz) ...
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What is the effect of the capacitor on the input power and torque of permanent split capacitor (PSC) single phase induction motor?

I need to know the effect of the capacitor on the input power and torque of a permanent split capacitor (PSC) single phase induction motor.
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Long term issues with AC/DC converter in always ON application

We have designed an "always ON" electronic home automation device which goes behind the switchboard (inside the wall.) This is the first commercial product that I am designing, so bear with ...
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RC 90 deg phase shift

What does 90 deg phase shift actually mean? Like, consider this below RC circuit. simulate this circuit – Schematic created using CircuitLab From what I understand, when I apply a sine wave at ...
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What's the benefit of putting capacitor between emitter and collector in dc circuit [duplicate]

What is the benefit of putting capacitor between emitter and collector in dc circuit
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9 votes
2 answers
1k views

Why are these capacitors treated as if they are in series? Why must the incoming and outgoing current in a battery always be equal?

A circuit with three capacitors and an open end at A: I am a high school student. I am very confused by this example. The circuit is open at end "A" as shown but still there would be some ...
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2 votes
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104 views

Capacitors exploding on PWM motor controller

I'm part of a project in which we are developing a PWM controller for a 24V DC motor. Our current problem is choosing a capacitor to replace C1, which keeps exploding. We've been running tests at ...
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28 views

Replacing safety capacitor [closed]

My hp z820 power supply has been failed after 7 years of work. I suspect that the safety capacitor (between line and ground) is the problem, but I can't find any information scripted on it to be a ...
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Capacitor in AC

I am new in this sphere and I would be appreciated to have some help. So I have this schema, and I don't understand what is the reason that the value of the capacitor amperage decreases after every ...
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Replacing blown out capacitor in old projector

My dad recently got his hands on an old Canon P-8 Cinestar S projector. When he turned it on he forgot to turn the switch at the bottom to the correct setting so it gave a bang and smoke came out. We ...
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Why do audio amplifiers have many capacitors in rows?

In this video, there are two main rows of capacitors on a Class D audio amplifier. I understand the power supplies need power filter capacitors, and that output stages need DC decoupling capacitors. ...
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-1 votes
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What is the total filter and output capacitor rating in this circuit?

Is the total filter capacitance 2.2uF? If so, is the output capacitor 82.4uF * 20?
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3 votes
2 answers
260 views

Interview Question

This Circuit was given. I know every component of this circuit individually, I know feedback and gain margin and transconductance amplifier. But the problem is how to start? first, I was thinking to ...
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Small capacitor in series with battery pack - Why/how?

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
550 views

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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1 vote
1 answer
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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
2 answers
263 views

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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1 vote
1 answer
52 views

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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77 views

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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2 votes
1 answer
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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 votes
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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4 votes
2 answers
934 views

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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-3 votes
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110 views

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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2 votes
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41 views

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
320 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
510 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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3 votes
3 answers
156 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
110 views

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
114 views

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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1 answer
56 views

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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1 answer
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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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1 answer
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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
226 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
720 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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1 vote
6 answers
156 views

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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1 answer
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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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0 votes
2 answers
97 views

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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