Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [capacitor]

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

2
votes
2answers
36 views

Slow build-up and discharge LED effect

I was trying to build a circuit that if switched on would slowly (in span of of 1~5s) light up around 20 LEDs - progressively, not all at once. To achieve that i used one capacitor to initiate the "...
5
votes
1answer
79 views

Switch high voltage with triggered spark gap

I want to switch a high current/voltage pulse (up to few 10kV, <1kA) from a capacitor as supply. It needs to be cheap and I don't care about efficiency too much yet. I took a look at using ...
1
vote
2answers
117 views

If there are more capacitors, are there more amperes?

I'm really new to electronics, and I'm wondering if adding a capacitor increases the output current. I have the following questions: Say for example, I have a 5V 1.0A Source, does the output current ...
0
votes
1answer
50 views

Ideal switch acting on a capacitor

Let's consider this circuit: and suppose that the capacitor C1, charged at the input voltage Vin, at time t=0 is connected by the switch to the virtual ground. Assume also that C and C0 are initially ...
0
votes
2answers
77 views

How can this capacitator discharge? (Make: Electronics experiment 9)

I am trying to get through Make: Electronics book and I cannot understand, how does capacitor in following circuit discharge when I press B button. Wouldn't the current just go in the circle that ...
0
votes
0answers
28 views

can I add a capacitor in parallel with inverter output to run motor load?

I have a 1000w pure sine inverter 12vdc -> 240vac, and I want to run a washing machine (front load bosch, 24 inch in an RV). The machine starts to cycle, then the inverter overload kicks in when the ...
0
votes
3answers
136 views

Can N-Channel MOSFETs safely discharge capacitors?

Can 3 ganged 120 A rated N-Channel MOSFETs discharge a charged cap dumping 300 A? Will the FETs just explode or can they repeatedly discharge the cap? What specific ratings and characteristics are ...
0
votes
3answers
89 views

High voltage input and low voltage capacitor in series safety

I’m working with a car battery that has a voltage drop when cranking the engine. As a result of this, the stereo restarts even though it was running already. To resolve the issue of stereo rebooting ...
0
votes
1answer
127 views

Create a blinking LED circuit with a z-diode and a capacitor

I was searching for the most simple LED flashing circuit. On a webpage (http://cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html) I found the following circuit with a transistor ...
1
vote
1answer
222 views

Why my Buck converter is undergoing smoke and fire

I am new to electrical. I am powering my router from 24V battery. But power requirement of router is 12V/1A. So I am using LM2596 buck converter. The specification for this buck converter is as ...
5
votes
4answers
4k views

Is a capacitor bad when it looks like this?

Hello I am new to the electronics field. I am looking inside of one of my synthesizers and I see some capacitors (I think they are Mylar, correct me if I'm wrong) that look like this. I know it is a ...
0
votes
2answers
47 views

Solar powered LED via capacitor?

I am building a large garden peice in wood, which I hope to illumine from within, powered by a small, (perhaps 90x65, 6v, 0.6w 100mA as space is limited) solar panel. After testing, I noticed that ...
6
votes
2answers
1k views

How to avoid a electrolytic capacitor on a (audio) signal path?

I've built a compressor basing on the all-in-one chip THAT4301. It works well. But I'm still not happy because of the electrolytic capacitor I used in the signal path. My design was based on the ...
0
votes
1answer
61 views

Can parallel addition of a bigger capacitor damage the smaller one?

I have connected big capacitors to the speakers to increase the bass. Now, after months of using, I notice that one of the speakers sounds 2x low. I ejected those big capacitors, still the same. I don'...
1
vote
0answers
54 views

Variable frequency of an astable

I have to make the frequency variable of an square waveform generator built with the help of an astable. I modified a circuit a found on the internet and everything seems good with only one exception: ...
-3
votes
1answer
50 views

What is rms power generated in an LC circuit? [closed]

LC CIRCUIT without ac supply. What is rms power generated or is it generated?
1
vote
3answers
99 views

Safety Capacitor replacement [closed]

I am trying to repair sewing machine by replacing a safety capacitor that burned up. I am not at all sure how to find an equivalent capacitor. Advice or links to an appropriate product would be ...
1
vote
1answer
52 views

DC Power Supply Output Caps: Electrical Advantage to using many smaller capacitors instead of few large?

Question: What is the electrical advantage to paralleling smaller capacitors to reach a given capacitance, rather than using fewer smaller capacitors on the output of a DC power supply? For example, ...
0
votes
0answers
64 views

Deboo integrator Query

I am trying to integrate a signal, to find out the area under curve in a particular time interval. However, I need to use unipolar sources and cannot use a normal inverting integrator. Hence, I am ...
0
votes
1answer
58 views

Feed through capacitor

I have 2 feed through capacitor NFM21PC475B1A3 & NFM21PC105B1C3. These haven't the same capacitance. I want to separate them but I can't measure. Help me what should I do?
3
votes
2answers
621 views

Non-inverting op-amp configuration with capacitor

I don't really get what is the purpose of the capacitor C1 which is connected in parallel with the feedback resistor. After my knowledge, if we modify the input signal frequency the over all gain will ...
0
votes
1answer
48 views

Is it normal for the OC2 vacuum tubes to glow bright orange during operation & OA2 to flicker while running?

I just got this vintage Heathkit IO-10 oscilloscope from ebay. Just tried powering it up and it seems to be working fine. But I noticed that the OC2 tube seems to glow very bright orange and the OA2 ...
0
votes
1answer
68 views

Can I use a capacitor which has 275v +-10% tolerance in a 9V circuit?

I am trying to get parts for a circuit i want to make and I'm very new at making circuits. As a result i'm unsure if i can use a 150nF capacitor with 275v+-10% tolerance in the following circuit or ...
1
vote
1answer
104 views

Discharging a capacitor quicker, using an exterior time varying magnetic field?

I was analyzing the possibility of varying an exterior magnetic field, that's aligned in direction with the magnetic field produced by the displacement currents(both parallel in the same plane) shown ...
1
vote
1answer
21 views

Question about equation for LT3750 capacitor charger IC

I have a question about the equation for minimum primary inductance on page 8 of the data sheet for the LT3750 high voltage capacitor charging IC. The equation in question: $$L_{\text{pri}} \geq \...
0
votes
0answers
75 views

Strange parasitic oscillation

Hi, I am building the following circuit but I have encountered the following issue: when giving power to the circuit, I get at the transistor base ( and at the collector too) the strange oscillation (...
0
votes
1answer
53 views

Complex Capacity

Recently we have been tasked to calculate the complex permittivity of a given capacitor. The formula suggests using the complex capacity of the capacitor. Which is what is getting me confused. I ...
1
vote
2answers
76 views

Trying to understand why the signal was inverted on this RC step response equation

I am watching this video where the guy is deriving the equations for the step function of a series RC circuit. At some point he has the following equation: \$ \frac{dt}{RC} = \frac{dv}{v_s - v} \$...
0
votes
1answer
69 views

How A/C board works on an air conditioner

I have a question. I got a Panasonic CU-C24GVK (24000 BTU Air conditioner), and the A/C board relay is burnt. If I'm not explaining myself, the A/C board is the thermostat itself, the board receive ...
0
votes
2answers
77 views

Trying to understand why the constant of integration was ignored on this RC circuit

I am watching this video where the guy deducts the voltage across the capacitor during the transient phase. There is an integral, in the middle of the equations. The guy integrates that and there is ...
1
vote
2answers
92 views

How do you model a “leaky inductor”?

My understanding is as follows: A voltage induces an electric field at a capacitor, which is measured in coulombs. If I wanted the capacitor to leak the charge exponentially, I could model that as a ...
3
votes
2answers
109 views

Help understanding this pulsing LED circuit

I started learning about op amps, and I came by this circuit and thought I should be able to understand it. What is tripping me up is how is it pulsing or varying with time? The source is supposedly a ...
0
votes
1answer
102 views

Why do XC and XL need to roughly match in an LC tank?

In an LC tank circuit, why do XC (XC1 + XC2) and XL need to be roughly similar? For example, in this Colpitts Oscillator taken from https://www.electronics-tutorials.ws/oscillator/colpitts.html, I ...
2
votes
3answers
83 views

Longest, thinnest trace length to decoupling capacitor before capacitor is effectively useless

I was told time and time again to always put decoupling capacitors as close to the IC pin's VCC as possible. Sometimes when I make complex boards, I try my best to put the capacitor lead so close to ...
10
votes
2answers
864 views

MLCC - Can I use high voltage rated caps for very low voltage scenarios?

Is there any important reason why I can`t use high voltage mulilayer ceramic capacitors for low voltage scenarios? For example 50V or 100V rated MLCCs for 3.3V DC applications? I have bad eyes, and ...
0
votes
1answer
48 views

Capacitor for spot welding

I've seen a video where the guy make a spot-welder using capacitors https://www.youtube.com/watch?v=1SMUFSiaV-8 AFAIK shorting capacitor is harmful. The question is: Are there any caps that can ...
0
votes
2answers
69 views

What kind of components are these (2)?

What kind of components are these? It shows: GA 62A And a symbol Does anybody know what specs these can have? (note: updated the question since they were not capacitors).
0
votes
1answer
64 views

What ceramic capacitor is this?

I'm almost sure this is a ceramic capacitor, but I have trouble finding its characteristics. The first picture is the top side, the second the bottom side. The first shows: 120G (or 12OG) and an F. ...
0
votes
3answers
142 views

RL-C Circuit Problem

I am trying to get some practice on the basics, but i am having some issues with the following question: Find Currents I(1) and I(2) and show them on a phasor diagram. Find the total current, I(total)...
1
vote
3answers
167 views

Understanding how an audio amplifying circuit works

I'm trying to learn electronics and electrical engineering through building small practical projects (toys mostly). I've been learning a ton from adafruit and spark fun, but I'm trying to branch out a ...
0
votes
2answers
81 views

Arduino Geiger Counter

I have found somewhere the following scheme for an arduino based geiger counter. (The arduino main purpose is to count the pulses from the tube) As far as I can understand it, the transistor would ...
0
votes
2answers
65 views

Polarised vs non Polarised Capacitor

Page 18. of http://www.ti.com/lit/ds/symlink/tlv5606.pdf shows a polarised capacitor. In a case like this, does it really matter whether the capacitor is polarised or not, as long as the capacitance ...
0
votes
2answers
62 views

Circuit to supply power to USB during car brownout [duplicate]

I have a USB car charger plugged in the accessory port of my car and I also have a simple bluetooth USB to aux adapter plugged into it. As I start the car, the power drops to the accessory port and ...
0
votes
1answer
17 views

Regulated power for radio module HM-TRP. Is config correct?

I'm trying to figure out how to make a nice power supply to the radio module HM-TRP. I heard that running certain voltage regulators with capacitors having high ESR values is a bad idea and will ...
0
votes
1answer
47 views

AC blower with run capacitor sometimes does not start up

I installed an AC blower motor into a cabinet to act as a ventilator for some electronics. Thankfully it has a wiring label. Based on the label, it must be a run capacitor induction motor. It ...
0
votes
1answer
56 views

LC Parallel Circuit with current source in steady state

I understand that ideal inductor behaves as a short circuit at steady state and the ideal capacitor keeps on filling infinitely. I read that the inductor will be short circuit and capacitor will be ...
-1
votes
1answer
35 views

Lpf ramp response intution [closed]

How to intutively draw ramp response of low pass filter intutively . I am able to do it from laplace transform but i am unable to understand..
5
votes
1answer
205 views

Are bypass caps reason why uC don't have flyback diode across ferrite bead in the sample schematics?

Often the IC datasheet recommends putting a ferrite bead before AVCC pin. First I started wondering if I don't need a flyback diode but than I realized that capacitor is probably able to absorb the ...
-1
votes
3answers
129 views

can capacitors amplify signals

while reading a topic on opamps, i came across this topic. it said, other devices like capacitors amplify signals differently for different frequencies, while opamps amplify signals irrespective of ...
1
vote
2answers
71 views

Question on Use of Y2 Saftey Capacitor in AA5 Style Tube Radio

In a radio I am restoring, there is a 0.1 uF capacitor between B- and chassis, designated as C12. My thought process is that if this capacitor were to fail, I would not want B- shorted to chassis as ...