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Questions tagged [electrolytic-capacitor]

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

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36 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
70 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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21 views

Direction of the electric field & displacement current within a rolled capacitor?

Considering that the direction of the E-field and the displacement current with a classical parallel plate capacitor are perpendicular to the plate's area; I'm not sure how they would be if the ...
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1answer
97 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
52 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
50 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
74 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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59 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
68 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
56 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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0answers
58 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
98 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
130 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
219 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
64 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
128 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
206 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
59 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
102 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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335 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
382 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
38 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
150 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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103 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
82 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 ...
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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 ...
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2answers
224 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 ...
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1answer
150 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 ...
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1answer
88 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? ...
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2answers
339 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.
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571 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 ...
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1answer
172 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 ...
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3answers
153 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 ...
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3answers
61 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 ...
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1answer
337 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 ...
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1answer
247 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 ...
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1answer
116 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 ...
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1answer
356 views

Surface mounted electrolytic capacitor markings

Is this 22uf / 16v? General rule of thumb for these markings?
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1answer
89 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 ...
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2answers
497 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 ...
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1answer
63 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 ...
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67 views

common mode and diff-mode

if we have this circuit and we want calculate output volt is common mode effect in this circuit if for example cmrr=100dB and Ac=10^-3 and Ad=100, Is common mode effect in this circuit?
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3answers
449 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 ...
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1answer
123 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?
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1answer
265 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 ...
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107 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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2answers
960 views

What do “cycles” in a capacitor mean?

I'm trying to replace some old leaky capacitors for this radio I'm working on and in the data sheet they have this rating of cycles for the large capacitors near the bottom of the sheet here: What ...