Questions tagged [electrolytic-capacitor]
An energy-dense capacitor type, used in low frequency filtering applications.
0
votes
1answer
45 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 ...
1
vote
2answers
50 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 ...
2
votes
1answer
470 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 ...
1
vote
2answers
84 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 ...
0
votes
1answer
86 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 ...
0
votes
1answer
90 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 ...
2
votes
1answer
49 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....
1
vote
3answers
147 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 ...
1
vote
2answers
98 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 ...
0
votes
0answers
28 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 ...
11
votes
1answer
943 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
166 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
369 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
98 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
213 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
116 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
70 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
53 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
201 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?
2
votes
2answers
156 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
76 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
107 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
90 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
474 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
146 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
303 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
70 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
184 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
408 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
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 ...
0
votes
2answers
177 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
628 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 ...
5
votes
1answer
473 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
228 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
192 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
117 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
367 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
239 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
111 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
681 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
932 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
276 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
182 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
69 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
538 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 ...
