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Electrical Engineering

Questions tagged [electrolytic-capacitor]

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

208 questions
info Newest Frequent Votes Active Unanswered
9
votes
1answer
529 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 ...
1
vote
1answer
146 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 ...
15
votes
3answers
362 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 ...
0
votes
2answers
63 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 ...
1
vote
3answers
116 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 ...
0
votes
1answer
112 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 ...
0
votes
1answer
62 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 ...
0
votes
1answer
52 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 ...
1
vote
2answers
104 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?
1
vote
2answers
125 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 ...
2
votes
1answer
70 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 ...
2
votes
1answer
76 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 ...
2
votes
0answers
74 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 ...
6
votes
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 ...
0
votes
1answer
153 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 ...
1
vote
3answers
137 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 ...
4
votes
2answers
273 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 ...
17
votes
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 ...
0
votes
1answer
68 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 ...
0
votes
1answer
157 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 ...
0
votes
4answers
312 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 ...
2
votes
1answer
60 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 ...
0
votes
2answers
142 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 ...
0
votes
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?
0
votes
2answers
468 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 ...
4
votes
1answer
437 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 ...
1
vote
1answer
39 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 ...
1
vote
2answers
180 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
0
votes
0answers
142 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 ...
1
vote
1answer
93 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 ...
0
votes
1answer
42 views

Capacitor Charging Voltages

I am trying to create a capacitor bank and don't know what voltage to put through. Do i add the voltage of all the capacitors up and apply that or just provide the voltage for one. e.g. If I have 10 ...
1
vote
2answers
299 views

How to replace electrolytic capacitors with non-electrolytic ones?

guys I've a little project and want to make a PCB for it, as small and thin as possible, but the electrolytic SMD ones are bigger than I wanted. With that I faced a small problem that led me to a ...
0
votes
1answer
196 views

Reducing voltage/current of AC circuit with makeshift bi-polar capacitor

WARNING! To others reading this question: This circuit uses high voltage. DO NOT mess with 220V/110V unless you know what you're doing and know the risks (electrocution and death, mainly) Now that ...
0
votes
1answer
96 views

0.1uf electrolytic substitute

I am replacing all electrolytic capacitors in an old CB radio but can't find a local source for this capacitor. Is there another type I can use in its place? Does it have to be an electrolytic type? ...
0
votes
2answers
527 views

Why capacitor are used in amplifiers

I made a sound amplifier and it requires a Capacitor, i removed the capacitor and my amplifier stopped working, what was amplifier doing in that circuit? Why on removing it circuit stopped working.
0
votes
3answers
774 views

Capacitor Value in Bass amplifier to speaker circuit

Replacing electrolytics in a 30+ year old Ampeg BT-15 bass amplifier. The PS filter caps are \$ 2500 \mu F/80V\$ which are rare to be found; I know that 3300/100 would be okay for the filter. There's ...
1
vote
1answer
233 views

Tube power supply capacitors replacement

I'm building the following power supply (credits to Audio design guide): I would like to replace C5, C8 and C9 with 1000uF capacitors (with the same voltage rate). From my understanding these ...
2
votes
3answers
165 views

Capacitors for 7805CV?

I have some questions about using capacitors with an L7805CV According to the datasheet, on page 4, it shows I need: C1 = 0.33 uF C0 = 0.1 uF I bought a few sets some time ago with 'common' values ...
0
votes
3answers
62 views

Unpolarized Capacitors in place of Polarized ones

I have found some projects of interest, and on them there are generally a polarized capacitor in the range of 10 multiple (0.1uf, 1f, 10uf, 100uf, etc), and I do not know why I ordered a lot of ...
0
votes
1answer
444 views

SMPS output regulation - should I use capacitance multiplier?

I'm trying to design a flyback converter to power my stuffs, I need about 3 A of current at 24 V. At first I though this was straightforward. However, after reading "Design Guidelines for Off-line ...
0
votes
1answer
280 views

Identifying the polarity of the aluminium electrolytic capacitor

I have the following device - polar electrolytic capacitor (it is/was having stripe on its sleeve): I know its capacitance and voltage rating - 2.2 uF / 400 V, but accidentally removed the remainders ...
1
vote
1answer
142 views

ESD and Electrolytics

Consider the simple circuit schematic below: 1) Would a high voltage (say 1kV-25kV) human body ESD discharge event (1ns rise time, 100ns total) at OUT have a negative effect (damage or destroy) the ...
1
vote
1answer
423 views

Surface mounted electrolytic capacitor markings

Is this 22uf / 16v? General rule of thumb for these markings?
0
votes
1answer
98 views

Busted Capacitor [closed]

I have a motherboard with a capacitor busted. When I put the CMOS battery on it, it randomly reboots after a couple of minutes. The busted Capacitor has a rating of 6.3V 3300uf 150*c. But the problem ...
0
votes
2answers
617 views

AMS1117 33 sot223: is it ok with ceramic capacitors?

This is the datasheet of voltage regulator that I would use: http://www.advanced-monolithic.com/pdf/ds1117.pdf Is it possible to exchange that 22uF with an equivalent (or larger) ceramic instead of ...
-1
votes
1answer
67 views

If I added a Capacitor to this circuit would it charge both and would the charge led still work?

If I were to add a second capacitor to this circuit of roughly the same capacitance (120uf). Would this circuit charge both up completely, and would the LED still accurately depict if the combined two ...
1
vote
3answers
599 views

Calculating total capacitance of a circuit

simulate this circuit – Schematic created using CircuitLab Question is, how to calculate capacitance of such a circuit. I made a schematic with resistors (because that i can measure) and from ...
1
vote
1answer
157 views

LM2664 can I use the ceramic capacitors instead of the electrolytic ones?

I need the negative voltage for my OPAMP and I use the LM2664 inverter. I have a very limited space available on my PCB. Is it OK to replace the electrolytic capacitors with the ceramic ones?
0
votes
1answer
298 views

Polarised capacitor - negative voltage?

I designed a circuit that is similar to the circuit on the picture below. The main difference in my design is that I am using a 3V battery and more LEDs. I am using UNPOLARISED capacitors because I ...
0
votes
0answers
124 views

Serial DC-link Capacitor to increase the effective voltage rating

I am developing a 2-phase motor driver system, which requires my inverter's DC-link to be near 480V. 480V is used to generate 2 line-line voltage of 220Vac(using 3-phase inverter). The Aluminium ...

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