Questions tagged [electrolytic-capacitor]

An energy-dense capacitor type, used in low frequency filtering applications.

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Electrolytic capacitor with slide pushed wall

I have a MacBook charger on which I replaced the charging cord recently. Once I open the lid, I notice that from the factory a screw touches one electrolytic capacitors and pushes the capacitor wall ...
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Tantalum Capacitor At Cold Temperatures

What could happen to a solid tantalum capacitor that operates below the lower temperature range defined by the manufacturer (-55C)? From my understanding, there would be a performance issue with ...
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What could be the cause of a limit in the voltage supplied to a capacitor?

Recently I built a very basic 2-stage coil gun for a school project. Each coil was powered by an electrolytic capacitor. In order to charge the capacitor, the coil connected to an IGBT (insulated-gate ...
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368 views

Electrolytic capacitor and AC

I'm doing an experiment to investigate the relationship between frequency and capacitance. The experimental setup is to connect an aluminum electrolytic capacitor to a function generator and use an ...
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How to recognize 105° C rated electrolytic capacitors?

If there is no explicit working temperature printed on the body of the capacitor can we assume is always 85°C? I have to replace a few of 1980s capacitors (manufactured by ROE, Frako, and Philips), ...
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Can I substitute a capacitor with the same rated capacity and voltage but a lower inductance and higher rated ripple current for a mobo repair?

I have an early to mid 2000's motherboard that I am trying to restore. It looks to be mostly in good condition but a blown radial electrolytic capacitor might be causing trouble. From the placement of ...
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ESR of aluminum electrolytic capacitors [closed]

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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Help identifying capacitors

The base of my my beloved robotic lawn mower has stopped working. It is the base that is the problem. If I unplug it for a while, then it will work for a few minutes, when I reconnect it. I have ...
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Using capacitors as a battery back-up

I have a device which is operated from a 12 VDC 10 A power supply and draws 8 A in operation. I need to run this device for at least 20 seconds when the 12 V power supply is lost upon a power failure. ...
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What is the result of wiring an electrolytic cap in series with a ceramic when parallel was intended?

FINAL UPDATE A reassessment of my power consumption has led me to the solution to all of my problems. I picked up a 5V, 5A power supply (giving me plenty of overhead), reassembled my project, and it ...
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Aluminum electrolytic vs. aluminum polymer capacitor

What type of capacitor should I use for a longer life (C8) aluminum electrolytic or aluminum polymer capacitor? It works at 400 kHz and must provide a current of 30 mA.
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How to Calculate Ripple Current?

How do I calculate the ripple current a capacitor will experience for a given circuit? For example, let's say I have a smoothing capacitor on the output of a full-wave bridge rectifier (120VAC, 60Hz) ...
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Which manufacturer's logo is this?

I'm trying to identify the manufacturer (and hopefully part number) for these capacitors. My guess is they're standard aluminium electrolytics, rather than something fancy like alupoly, but I can't ...
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What is this capacitor?

Can anyone confirm what the markings on this capacitor mean? I think it's a 560 μF capacitor, but I am used to seeing that on the first row of similar devices. For voltage, I believe it's a 35 V ...
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What is the purpose of these different-value capacitors? [duplicate]

I guess I am trying to figure out why we wouldn't just consolidate these into one single 22.11uF capacitor. My initial understanding was that each capacitor was better at filtering certain frequencies,...
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Polarity of electrolytic capacitor

Electrolytic capacitors can only be biased by one polarity of the voltage. I am having a hard time understand how to connect a electrolytic capacitor to a voltage source. The symbol of a electrolytic ...
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4 votes
1 answer
268 views

How to calculate the voltage out of capacitor?

In the above image a small part of a large circuit I'm trying to understand. V1 : 220v @50 D1 : Any diode like 4007 R1 : 270k R2 : 16k C1 : 10u to 100u M1 : Voltmeter Vout = (Vs*R2) / (R1+R2) ...
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Electronic components pressure rating [closed]

I have made a custom PCB that measures acceleration. The PCB contains components such as op-amps, SMD resistors, COG capacitors, and tantalum capacitors. The circuit is powered by a saft ls14500 AA ...
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Why conductor having charge(let say 1C) have tremendous potential but same conductor used in capacitor have low voltage?

When we talk about electrolytic capacitors or the supercapacitor(EDLC) then we know that, we can store large amount of charges in it. Since in electrolytic capacitors Aluminum plate acts as cathode ...
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How to rectify and smooth a high frequency sinewave

I'm working on an experiment that generates a high frequency sinewave using an air core transformer. How can I rectify and smoothen this high frequency sinewave because most of the high current ...
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Why is there electrolyte soaked paper in an electrolytic capacitor?

I know that the soaked paper spacer is there to protect oxide layer but how does it protect it and from whom does it protect it? Why does the paper spacer need to be soaked in electrolyte and what ...
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1 answer
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Shorted capacitor

The aim of the circuit below is to continuously switch power from one LED to another (D1 & D2). The issue comes arises when I close the push switch (SW2) and an error message pops up saying that ...
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How robust and stable is this circuit?

I have a small delay circuit to automatically open my building door by pressing the intercom button for a few seconds. Whenever the intercom button is pressed the switch closes and the cap starts ...
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Are my capacitors working properly or not?

I've bought some capacitors because I needed to generate a current pulse into a coil. The idea was to charge a capacitor separately and then connect it to the coil to have a strong and brief magnetic ...
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1 answer
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I have a height problem (with my switching regulator on a height constrained PCB)

I was planning to use this part (datasheet) (basically MC34063 with thermal shutdown,) but I don´t have enough room above the PCB. I need to keep the components under 2.2mm. According to my ...
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How to combine elecrolytic capacitors into one big bipolar one

I want to make capacitor with large capacity which can hold both positive and negative charges. Is it possible to combine elecrolytic capacitors somehow to achieve this?
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Where to place a cooling fan supply capacitor

I want to run a ~2W, 12 VDC fan in an EMI-sensitive environment. The schematic is shown below. Due to the spiky current draw, I intend to place C1 and C2 right by the fan connector, so high frequency ...
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Circuit won't blink, and probably can't. Or can it?

I have tried to understand the simple circuits in the questions Intuitive and iterative approach to understanding of blinking LED circuit and Changing the frequency of a flashing LED. I've built them ...
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1 vote
1 answer
111 views

What is the Dissipation Factor of a capacitor useful for in its direct form?

Why do electrolytic capacitor makers provide the low frequency ESR in the form of a dissipation factor (DF) instead of an Ohms value as they do for higher frequency. The DF is rather unwieldy and I ...
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2 votes
2 answers
207 views

What are the consequences of using a capacitor that is of higher capacitance?

I'm troubleshooting a circuit board that has a dead short somewhere. I removed some capacitors which were shorted in circuit but the problem was elsewhere on the board. When testing these 1500uf 2.5V ...
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-1 votes
2 answers
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Electric capacitors instead of earthing electrode

I'm going to make a partial EM-shield (using aluminum) for my 3G USB (2.0) modem, and I need to "ground" electricity from the surface of that shield. Daily worktime for that 3G modem is ...
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Excluding visual inspection, are there general strategies for guessing at potentially damaged electrolytic capacitors in a given device?

In many cases of checking for bad electrolytic capacitors on a non-working electronic device, the number of capacitors makes it infeasible (for me anyway) to simply change out all of them one by one ...
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2 votes
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108 views

From where can I get the impedance graph/ frequency response information of a capacitor?

I want to know the self resonant frequency (SRF) of a tantalum or aluminum capacitor. Is this usually supposed to be there in the datasheet? I am wondering why it is not mentioned in datasheet since ...
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Can we use electrolytic capacitors on IC power rails?

Can we use bulk electrolytic capacitors on the power rails of an IC? I know that we will use bulk capacitors in switching regulators at input. Can anyone explain why or why not and how to find ripple ...
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1 answer
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Putting AC across polarised capacitors in headphone amp?

This circuit is from Fig. 20.3 in Douglas Self, Small Signal Audio Design, Third Edition, Routlege, 2020. This is a headphone amplifier, and as such, both input and output signals are alternating ...
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227 views

Replacing Darlington with MOSFET for capacitive discharge circuit into a solenoid?

I have the following circuit and criteria and am wondering if it makes sense to replace the Darlington transistor with a MOSFET, and if so how would that change the circuit? This circuit turns on T1 ...
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Problem simulating electrolytic capacitor at high frequency (GHz+ range)

simulate this circuit – Schematic created using CircuitLab I am simulating a circuit in LTspice in which I use an aluminum electrolytic: C=100µF, Rser=0.25, Lser=5n Due to some other components, ...
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9 votes
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What's the use case for a 0.1µF electrolytic cap? [closed]

I've noticed 100nF electrolytic capacitors are made and sold, which means people are probably buying them, but... ESR is huge, ripple current is tiny, accuracy is low, and they're larger and more ...
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How do I fix a circuit that keeps blowing a capacitor?

I have an aftermarket AC>DC wall wart that was made in China and there is an electrolytic capacitor in the circuit that blows about every 2 years and it just happened again. I'm tired of replacing ...
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4 answers
100 views

Stabilize voltage on 12VDC model train loco - both directions

I am looking for a simple solution to stabilize the voltage on a 12VDC model train inside the loco, to overcome areas of bad contact on the track. For energy density I wanted to use electrolytic ...
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What capacitor value should I use for 3.3v from a buck converter IC?

I am relatively new to electronics and trying to design a buck converter circuit using the XL1509-ADJE1. The datasheet specifies that for the adjustable versions (which this is) you should use ...
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Discolored negative lead on electrolytic capacitors

Would the discoloration around the negative lead of these capacitors be a sign of failure? If so, why would the negative lead darken instead of the positive - or both leads. They are Maron EFM 35 ...
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Precise capacitor in parallel to power supply

I found this schematic in ADNS-2610 datasheet. There are two capacitors in parallel between pins 6 and 7 (GND and VDD.) One is 4.7 uF and the another is 0.1 uF, so the parallel result is 4.8 uF. Why ...
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Proper material for testing capacitor at 105°C

I've built a circuit to estimate capacitors life. I need to test it at 105°C. I have no idea which material to use for the chamber that I want to put my capacitor in and control the temperature.
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What is the effect of operating an electrolytic capacitor beyond the rated temperature?

I know that the life expectancy of an electrolytic capacitor doubles by 10 degrees decrease in ambient temperature. Is this rule applicable when working beyond the rated temperature or maximum ...
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Capacitor Lifetime

Can anyone some sample calculation on how to calculate the lifetime on an Aluminum Electrolytic capacitor who's Endurance value (Assumed as Lifetime value is 2000 hours at 105degC). The manufacturer ...
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capacitor uF values question

Can I put a bunch of 220 uF caps together to get a higher uF value? or is it best to replace with the same value of cap.
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2 answers
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Non polarized capacitor uses

I am fascinated with capacitors. The ones I am most familiar with are the polarized capacitors. I know how they work and what to use them for. There is one capacitor though that I am not familiar with....
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6 votes
3 answers
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Why are some capacitors bent on old boards?

I've noticed that on older boards some of the electrolytic capacitors don't sit up straight, they're not totally vertical. I wonder why this happens, is it because they were soldered by hand and the ...
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3 answers
446 views

Can we use a capacitor with battery to fast charge it?

Consider this. Many capacitors connected in parallel to an input line, those capacitors are in series connected to battery. Whenever we need to charge, we plug in adapter that charges the capacitors. ...
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