Questions tagged [capacitor]

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

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Can a capacitor of lower capacity than required be harmful?

I want to make a full wave rectifier for my highschool physics project. My mentor suggested I get a 24V 1000μF for it but I could only get my hands on a 50V 100μF capacitor. The voltage supply is a 9-...
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appropriate capacitor ratings / types for 5 V DC power supply?

I am designing a 5V DC power supply. I will explain the main component set up excluding the capacitors since I am not sure of capacitor placement or appropriate ratings. I intend to supply power to ...
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Exploding/superhot capacitor in XT AC-DC PSU

I have a commercial replacement PSU that I am using for a vintage XT class computer which has 4 DC lines (5v, 12v, -12v and -5v). On fitting the PSU however, the PC operated but after a while under ...
Willinliv's user avatar
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Do non-polarized capacitors need to be in any type of orientation?

I have submitted my PCB design to JLCPCB for population. They are asking me if the orientation of my capacitors are correct: My PCB and schematic of it: In the datasheet it states that these are non-...
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Do I need a resistor in circuit when charging capacitors?

I want to charge a group of capacitors whose total equivalent capacitance is \$ 705 \:\mu F\$ and whose equivalent series resistance is on the order of \$10^{-2} \:\Omega\$. I am trying to charge them ...
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Can you replace ceramic or tantalum capacitors with aluminum electrolytic capacitors?

I have a question about the hookup for my 12VDC to 5VDC step down module - the K7805JT-500R3. It states in the datasheet that ceramic capacitors are what can be used but it also states that tantalum ...
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Zener diode over capacitor to ground on PCB for PV module

For a school project, we are required to open a PV module and examine its circuitry to understand how the module functions. At the DC input side, which is powered by the PV string, we have Cy ...
Jef Dank's user avatar
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Output stage filter of a buck regulator and ESR

I am trying to design a two LC stage output filter on a buck converter. And as the needed peak to peak ripple has to be pretty low ~ 1 mV, the overshoot and undershoot need also to be pretty low, I ...
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How to charge capacitor bank safely?

I am making a project that needs a capacitor bank. I have six 250 V rated capacitors, a 120 V - 240 V step-up transformer, and a bridge rectifier. Is it safe to charge these using a wall outlet (I am ...
toomanyfeet's user avatar
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What is the purpose of these capacitors connected directly to the OpAmp output?

I am studying this schematic and I come across the following section: As can shown capacitors are connected directly between the Op-Amp output to the supply (5V). What is the purpose of these ...
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Phase difference between voltage across a capacitor and the source in a low pass filter

Consider I have a low pass filter like that in the figure. simulate this circuit – Schematic created using CircuitLab I have considered the voltage source to be \$V\$ and the voltage across the ...
M.Riyan's user avatar
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Why is the voltage across a capacitor in the Laplace domain equals I(s) / s?

The original transfer function is I(s) over V(s) for a basic circuit that contains a resistor, inductor and a capacitor with a voltage source (Basic RLC circuit) where R is the resistance of the ...
SwiftEnthusiast's user avatar
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69 views

Why does the current into a capacitor stop when it's fully charged?

I am a newbie at electronics and I want to ask when the capacitor is fully charged why the current is stopped.
ElectroNoob's user avatar
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Identifying old capacitor

I need help identifying the capacitor that needs to be replaced. The capacitor was located in the motor of the sewing machine. It is not clear in the pictures, but it says: .01 + .0005 x 2 and 600WV....
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Reverse electrowetting on dieletric using air bubble displacement for electricity generation

I read this research paper and it uses bubbles to change the electrolyte and electrode interface, thus causing a change in capacitance as the bubble forms and exits the electrolyte. For reference: ...
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Can dielectric coated metal wire mesh in electrolyte be a capacitor

Since capacitance is proportional to the area of the plates, why don't we just make a mesh out of metal wire (plate #1) and coat it with a thin layer of dielectric material, then submerge this mesh ...
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Selecting Balancing Resistors for HV Capacitor Bank

I am constructing a High Voltage (150 kV DC) capacitor bank. I have elected to connect 10 capacitors in series, with 10 such branches connected in parallel. My next mission is to create balancing ...
Wyll Astarion's user avatar
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Glue gun series dropping capacitor

I have a 40 W on label glue gun for 230 V socket, PTC element could be 20 W as some manufacturers use 20 W instead and label it as 40W . I want to add a voltage dropping capacitor to increase its ...
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Using capacitor with voltage rating close to input voltage

I am using a buck converter in my design. The input voltage is 12V and output voltage is 5V. The capacitor C331 and C332 are 10 uF 25 V in 1210 package. The inventory have already 16 V 0805 capacitors....
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DOIT esp32 devkit v1 schematic confusion

I'm creating my own small dev board for the esp32 wroom module. I'm following the schematics for the DOIT devkit v1 module. Full schematic here: https://embedded-systems-design.github.io/overview-of-...
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Memory Capacity and Memory Addresses

According to this site, in Table2, HBM(HBM2e) has a capacity of 8Gb = 2^33 bits per channel. Here, it has a 24-bit address consisting of 4 bits from the Bank address BA[3:0], 15 bits from the Row ...
cashew_nuts's user avatar
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Capacitance of MOS capacitor vs orientation

Edit Both FETs are the same PFET with the same dimensions. I wanted to check the capacitance of a MOS capacitor vs its orientation. I expected the gate low orientation to have greater capacitance ...
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How can I calculate the amount of crosstalk/parasitic capacitance between two plates with different voltages across them?

I will preface this with the fact that I am a nuclear engineering student, not electrical, but I am working on a senior design project that might as well be an electrical engineering project. We don't ...
Natalie Coon's user avatar
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Can a capacitor be used for biasing?

I have a load switch IC SiP32431DN which internally has a comparator at its input stage (connected to its on/off pin). If I connected a, let's say, 100nF capacitor to this on/off pin, would that be ...
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How can I calculate the right capacitance value if I have voltage, current, watts and power factor?

I have test results. As we can see, there is a lot of information about voltage, current, watts, capacitance, etc. I have tried to calculate the capacitance value (Cap./Ind.) in the picture, but I ...
user16266657's user avatar
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Can Y-Cap Remove DC Offset between Grounds?

I ask this question because I saw this in an Altium article: In power systems, be careful how you use a capacitor to ground to ensure a consistent ground reference. Y-rated capacitors are best in ...
andykkkk's user avatar
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How can I calculate the gain of this high pass active filter?

This is the circuit I'm trying to make: This is the circuit I made for simulation in Proteus: These are my measured values as a result of Proteus simulation. This circuit is used to measure the ...
bevren15's user avatar
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1 answer
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Voltage Doubler capacitance calculation

I have an astable multivibrator that produces 5 V square wave input to the push pull and the voltage doubler part of the circuit. Now somehow the simulation works at 0.1 uF capacitors for the voltage ...
Jenil Makwana's user avatar
2 votes
1 answer
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Components Used in an Opamp Circuit Measuring AC Voltage

Why do we use this capacitor in the opamp and why do we superimpose it on the DC voltage and then destroy it again with the capacitor? I got some answers here, but as @SamGibson pointed out, I opened ...
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Why do we use this capacitor in the opamp and why do we superimpose it on the DC voltage and then destroy it again with the capacitor?

I am interested in the ZMPT101B circuit and there are a few things I cannot understand. This circuit is designed to measure AC Main voltages between 50Hz and 80-250V and to be read from an MCU like ...
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Capacitor Selection For Induction Heater

I am looking to select capacitors for an induction value. The target value of the bank is 4.7uF, and my power input is going to be 48V up to 10A. Based on some simple calculations, I estimate the ...
jb0's user avatar
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The output of my rectifier which should be charging a capacitor on LTSpice is extremely jumpy and inconsistent

For some reason, every time that I include a capacitor in this circuit LTSpice transient analysis is very jumpy. Is there a better way to use the output of a bridge rectifier for this purpose? I tried ...
Alex Heinle's user avatar
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Why equivalent capacitor has different value based on the counting side. A simple example is given below!

If I count for the equivalent capacitor value from the beginning then I get 21.6 uF (12 and 6 is in parallel and they are series with 6 6 capacitors. Now if I reverse the count. 6 and 6 are in series ...
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Better to use low ESR or high ESR caps?

I'm replacing the old filter capacitors on Marshall guitar amp and I was wondering if I should use low/non-low ESR caps for this. As my understanding is (which is neither deep nor correct probably) ...
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Capacitance measurement mode on the multimeter

I have one more question related to my cheap Aneng SZ08 multimeter, which I've purchased recently and am discovering its capabilities. This question is related to the capacitance measurement mode. To ...
Gog's user avatar
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Choosing filter capacitor and inductor for AC to DC rectifier

I am designing a three phase AC to DC rectifier. This DC output will be connected to a 6 IGBT bridge. That IGBT will be controlled using SVPWM technique to control a PMSM motor. What factors do I need ...
Syed Kumayl Raza Moosavi's user avatar
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2 answers
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How does this oscillator circuit work? Inductor phase

I simulated in it LTspice software. The voltage waveform across capacitor C4 was sinusoidal. I know its some kind of oscillator but don't know how it's operating? I think the reason behind center ...
nitin shrestha's user avatar
10 votes
2 answers
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Is this really electrolytic capacitor leakage?

I have three vintage power supplies that all show what appears to be electrolytic capacitor leakage. However, after removing two of them from one of the units, I do not see leakage from the bottom of ...
techrah's user avatar
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Why design a clamper circuit with battery in series with a resistor?

I have been trying to design a circuit that clamps the positive peaks of an ac signal to +6 V. We can use batteries, resistors, and capacitors of any value desired in addition to Zener or conventional ...
RK Eshat's user avatar
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Is it safe to short a capacitor with AC?

Context: my house is equipped with an old ventilation system located in the attic, basically just an asynchronous motor with a fan that extract air. It is possible to choose between two speed, full or ...
Benoit's user avatar
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Why +ve charge(conventional current) flows out of the -ve terminal of a battery?

Please consider question 45 part c. In this question if I consider that the capacitor after being fully charged at 24V is now connected to a 12V battery, and since some heat will be lost as charge ...
Aditya Mukherjee's user avatar
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Capacitor connected to voltage source with no resistance

In my introductory electrical class there was a question with a scenario that completely confused me. It asked what the current drawn by a 1000uF capacitor would be after 10ms if it was connected to a ...
lizaerd's user avatar
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Circuit Analysis: Capacitor voltage surge

I am new to electronics and I am experimenting with falstad circuit simulator to understand how capacitors work with different components. In the below circuit, when the switch is open , the capacitor ...
NTOS Linux's user avatar
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Calculate capacitor charging constant time connected to battery and boost converter

I know the formula to calculate the constant time for capacitor is t=RC and for full charge t=5RC. In the following example there is not resistor in the circuit but of course we are not in the ideal ...
Ahmed Mohamed Hassan's user avatar
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3 answers
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Can capacitors be used to work as a mosfet?

I'm a beginner to electronics and I'm trying to work out how to make a MOSFET circuit using purely capacitors, I understand that a MOSFET can be replicated using capacitors - however the unique nature ...
starboy's user avatar
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How does this oscillator circuit works? [duplicate]

When the switch is closed, the current flows through the resistor and because of it high amount of current flows through lower portion of the coil and led turn on. In the meantime, because of the ...
nitin shrestha's user avatar
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1 answer
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Does potential decrease across capacitors on moving from +ve terminal of cell to -ve terminal?

If I have two capacitors connected in series across a cell, does potential always decrease successively across the capacitors as I move from the +ve terminal of the cell to the -ve terminal, or is it ...
Aditya Mukherjee's user avatar
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1 answer
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Adding inductance in order to make AC offset

everybody The task was to introduce a 10 MHz AC signal to the output along with the 24 DC voltage. If I directly connect DC to the circuit, at the output (75 Ohm resistor) I get the straight line =>...
Bushpulbek's user avatar
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2 answers
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What is the step by step mechanism for charge to accumulate on the capacitors of this circuit?

In this circuit, what will initiate the charge to flow from the batteries to the capacitors? I would like to know how is sufficient potential difference created in this circuit to allow for the ...
Aditya Mukherjee's user avatar
2 votes
3 answers
234 views

How does this oscillator circuit with a transformer work?

I know it is an oscillator circuit but I don't know how it works. This circuit is supposed turn the LED on and off continuously. Can you please explain it to me? The star sign in the figure is not ...
nitin shrestha's user avatar

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