Questions tagged [electrolytic-capacitor]

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

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51 views

My RT8272 buck dc converter fried in my test charging circuit for arduino

I'm building a circuit to power an arduino and later a stepper motor from a 3A 24V DC source. The DC power source is a switching power supply, much like those used in notebooks. I'll need after ...
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1answer
74 views

Can a castellated PCB/module have electrolytic capacitors in it?

We're designing a small module (3in x 3in) that will have castellations on the edges for connection. I just watched a video on castellation PCB design. The video talked about the module going thru ...
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39 views

How to calculate a capacitor's discharge time? [duplicate]

How do i calculate a capacitor with a specific capacitance loaded with a specific resistance discharge time and reach a specific voltage? So let's say i have a 22uF capacitor charged with 12 volts ...
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41 views

Discharging radial electrolytic capacitors

I'm a beginner/intermediate in electric engineering and had to discharge a few electrolytic capacitors last week in a hobby starter kit (not too high voltage) and now I have to discharge some more ...
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1answer
405 views

Why do some devices use electrolytic capacitors instead of ceramics for small value components?

I've recently run into a number of consumer-grade devices that use 50v, 0.22uF electrolytic capacitors, as well as other similarly rated parts, all below about 10uF. In use, the voltages on them are ...
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1answer
70 views

Safe way to reform high-voltage capacitor

This week I received an old photographic studio flash unit made in the early 1960'ies. Inside is a huge 40µF/2500V capacitor. I don't know the usage history of the unit; it may not have been used for ...
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21 views

Aluminum Electrolytic Capacitor submersed in synthetic (PAO) oil

We are testing solar water pumps which have the 3phase inverter for the BLDC in the down hole pump. The boards (one power board, one controller board) are submersed in the lubricant oil that is used ...
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1answer
59 views

Assembling and Dis-assembling a Charged Capacitor

If I have an electrolytic capacitor, which is a cylindrical body in which the two plates are rolled-up with a dielectric paper in between them, of very high value (say 1F) and I charge it using a DC ...
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61 views

Brand / Supplier of this capacitor

Having trouble to identify this capacitor, not for its values but its specifics. They're all being used in the AKAI reference series. This particular photo was taken from the power supply board of the ...
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3answers
4k views

Is the capacitor drawn or wired wrongly?

In my recent study of electronics, I chance upon a guide on building a line-following robot. In one of the diagram shown, I realized that the capacitors, namely, C1, C2, C4 and C5, all marked with red ...
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1answer
66 views

Two modes of electrostatic force with charged capacitors?

During a charged state of a capacitor (Regardless of the type of capacitor), Simple parallel plate: .png Parallel plate with dielectric material in the gap: ]3 Supercapacitor: How is the ...
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2answers
93 views

Bulk Capacitor for Motor Driver

I'm creating a motor driver for a BLDC motor. I was wondering how we can calculate or choose what capacitance we need for our purposes. We're using the motor driver for a chain drive /transmission ...
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1answer
483 views

Can you identify these SMD Electrolytic capacitors? [closed]

I'm fairly sure I need to replace the capacitors in this LCD panel from 1993, but I'm not 100% sure I'm reading them correctly. I'm guessing that the large ones are 47uF 16V, the medium ones are 10uF ...
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89 views

Decoupling capacitor placements and ratings - how to choose?

I am building a circuit with 2 hybrid stepper motors each powered by a stepper motor driver A4988 and both drivers are connected to an Arduino UNO R3. Before soldering the components together on a ...
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1answer
88 views

How to tell if a printed capacitance is the actual value or a capacitance code?

My confusion was inspired by this question. The OP asked to identify an electrolytic surface mount capacitor and its ratings. I answered assuming the pictured capacitor's capacitance was a three ...
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1answer
110 views

Will this capacitive discharge welder design work?

I'm an electronics newbie trying to learn about the subject through tinkering, and my current project is a capacitive discharge welder for welding on battery terminals. I thought I'd better have ...
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1answer
52 views

What happens when a Cap fails?

I am trying to understand What happens when the Electrolytic caps fail at the input terminal of a charger? What about at the output of the bridge rectifier? These two caps below are rated 100uF @ 200V....
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3answers
205 views

Can you replace electrolytic capacitors with tantalum ones?

Due to size constraints on a custom PCB, I have opted out for using the smallest type of electrolytic capacitors (3 mm diameter.) However, capacitors in such a small diameter are almost impossible to ...
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2answers
122 views

Why do bipolar electrolytic caps have a long and short lead?

Ok maybe not all, but the Nichicon UES series of bipolar "audio-grade" electrolytic through-hole caps have a short lead and a long lead.. Why? The datasheet has nothing to say about it. This fairly ...
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35 views

1V Overshoot and Undershoot on Power Rails of LTE Module

I have designed a PCB (four layer) having SIM7600I LTE Module. The Stackup is: Signal & Component Layer with Ground Pour Internal Ground Power Plane Internal ...
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1answer
947 views

Storage of electrolytic capacitors - how long?

I have a high voltage (750V) high value electrolytic cap about as big as my forearm. It has been in my storage box for about 20 years. In general, do electrolytics degrade under normal storage ...
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1answer
179 views

Why is the electrolytic capacitor not polarity sensitive?

The issue I was making a project in which I had to use a 2.2uF electrolytic capacitor in series with a microphone and weirdly, the circuit works even if I toggle the polarity of the capacitor, that ...
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3answers
376 views

Maximal operational pressure of tantalum and electrolytic capacitors

I need to design a device that have to operate in an high pressure environment (Nitrogen gas). The operational pressure may vary from 1bar (atmospheric) up to 20..30bar gauge pressure. The regular ...
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2answers
119 views

Replacing a Capacitor on an Onkyo HT-R960 A/V Receiver

I have an Onkyo HT-R960 receiver that's been acting very flaky for the past couple of months. I've had to let it warm up for several minutes before being able to use it. I would also have to turn it ...
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3answers
282 views

Capacitor max safe operating voltage

I'm currently making a power supply with a 32 volt AC out, so the rectified voltage would be 32*1.414-diode drop. The value comes around 44 volts. My question is, is it okay to hook up a 50 V rated ...
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1answer
131 views

THAT4315 audio analyzer - capacitors getting hot

I have designed a audio spectrum analyzer circuit with THAT4315 and a drivers for IN-13 bar graph nixie tube to visualize the signal level. To supply +-12V to the opamps, the Meanwell NSD15 module is ...
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1answer
76 views

What is this solar power RC circuit doing?

I am a CSE student working on a project. We are using a solar powered microcontroller. The solar panel's power goes through a fuse and an RC circuit with a varistor to the charging system. What ...
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1answer
55 views

Series capacitors; negative voltage

Interesting observation today; I set up a series stack of 4 cheap electrolytic capacitors (10V 220u) and after about 5 mins of applying 30V the lower most cap had settled at -300mV. The other three ...
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2answers
264 views

Identifying polarity of capacitor from PCB printing

I took out the old capacitor and didn't remember to check the polarity because I assumed the board would have more standard markings. Is there any way to figure it out with a meter or by the printing?
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189 views

Non-Polarized Electrolytic Capacitor Replacement

To the best of my abilities, I'm trying to repair an Atari 800XL which was sold as "non working unit". I found a new graphics chip and it's working ok. I though that, since I had it opened up, it ...
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1answer
79 views

How far does reforming a capacitor help? Does it have any adverse effect on using such a capacitor on components?

I read a few articles on the internet about reforming capacitors. Does this actually apply only to a capacitor that was stored during a certain period of time or can it be used on any electrolytic ...
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1answer
125 views

electrolytic cap shelf-life after being mounted on circuit borad

My question is about whether there would be a problem with aluminum electrolytic capacitors that have been installed in an amplifier, then factory tested (so a current was run through them), then ...
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109 views

Replace filtering(?) capacitor on CRT deflection Board

I am doing partial recap on CRT monitor Sony PVM 20m2e. (monitor was working, but RGB lines at the top of screen which should be hidden were visible and geometry is not top notch) I desoldered C584 ...
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2answers
2k 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 ...
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1answer
844 views

Can I change a capacitor with one with a higher capacitance?

Hi I have just joined after lurking a lot because I haven't found an answer that was specific enough for me. I have a Soviet synthesizer (TOM 1501) and it has some odd defects such as clicking noises ...
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3answers
158 views

How an electrolytic capacitor survives in negative half cycle?

An electrolytic capacitor doesn't like higher voltage at its opposite terminal i.e higher voltage should only be at positive terminal as per convention.If that so how the capacitor survives in this ...
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2answers
321 views

Can I place an electrolytic capacitor close to a solder point on a two sided pcb?

I’m designing a pcb, which is going to be installed inside a metal chassis. To minimize space I will make it a two sided pcb. (See pictures) Because there will be parts mounted on the top face of the ...
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3answers
2k views

How to Measure Very Large Capacitance e.g. Super/Ultra Capacitors

I have recently acquired a couple of mysterious ultra/super capacitors from my brother. Apparently he doesn't remember any of the specifications or even brand... To further complicate matters, they ...
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1answer
71 views

Chargng Capacitors in series

I am trying to build a capacitor bank for a project in order to feed an inductor with "high" voltage(500V) however I only have a dc generator rated at 100V at my disposal. Charging 5 identical ...
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1answer
202 views

Electrolytic Capacitor Internal Resistance

I'm doing an experiment to investigate the internal resistance of an electrolytic capacitor in a DC circuit. Doing this I am measuring the discharge voltage against time, finding tau and from there ...
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4answers
476 views

Could a larger capacitor, at the output of the SMPS, destroy components with larger current draw when its being charged?

I am designing a SEPIC converter using a LT8364 for "power aplications" and a buck converter using a TPS62125 for powering a MCU. Since I have a bunch (>100pcs) of 100uF, 16V, electrolitic caps ...
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1answer
62 views

Using a higher C than necessary in a voltage regulator circuit

I've two questions: If I've a voltage regulator that says in the datasheet to use electrolytic capacitors is it possible to use 'normal' capacitors with the same capacitance? I've the circuit drawn ...
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2answers
212 views

How to tell solid vs. non-solid electrolytic capacitor?

Datasheet of these capacitors (Panasonic FK series -- surface mount) does not say anything about it (https://industrial.panasonic.com/cdbs/www-data/pdf/RDE0000/ABA0000C1181.pdf). For reliability ...
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1answer
51 views

Capacitance of a circuit [duplicate]

In a circuit diagram were capacitance value of an electrolytic capacitor is given, how do you know the capacitor voltage to use?
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730 views

Electrolytic Capacitor Tolerances

Recently I went to order a set of these 100uF electrolytic capacitors with 10% tolerance, needed for impedance balance for an audio output. When I noticed they were out of stock, I decided to order a ...
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1answer
497 views

Electrolytics and PCB Routing

In researching whether or not it's common practice to run traces/place vias underneath electrolytic capacitors (specifically SMD electrolytics, didn't seem like it would be an issue to me), I came ...
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1answer
41 views

Is it safe to plug the connection end of a capacitor?

I need to put a capacitor between my motor power supply and ground cables, and have covered the connection with resin for safety. Is it safe to do this? It's an aluminium electrolytic capacitor by ...
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2answers
283 views

Aluminum Electrolytic Capacitor with small dent still usable?

I have three 10000µF 75V Aluminum Electrolytic Capacitors. The aluminum can has a very shallow dent. Would you think this is still safe to use them? I have three of them, and they are expensive
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230 views

Maximum frequency for use of polarized electrolytic capacitors in voltage multiplier circuits

I would like to build a capacitor-diode style voltage quadrupler driven by a sine wave or square wave generator with frequency in the range 10khz-100khz. My concern is the type of capacitor I need to ...
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1answer
122 views

Decreasing measure of capacitance

I pulled a handful of electrolytic capacitors from a PCB and checked their capacitance on a multimeter. The number was not stable, but it also didn't average about some central value but rather ...