# Tagged Questions

1answer
59 views

### For which frequency is ESR specified by default?

I'm playing around with an REF5010 voltage reference, and its data sheet specifies an output capacitor with an ESR of 1 to 1.5Ω for best performance. Now when I measure the ESR of electrolytic ...
1answer
85 views

### Determine the polarity of aluminium electrolytic capacitor

This question was inspired by this one: Determine Polaritry of Aluminum Electrolytic Capacitor. I thought that the question would be on how to determine the polarity if there are no markings and the ...
3answers
180 views

### Aluminum Electrolytic Capacitor Dissipation Factor

I am using a big aluminum electrolytic capacitor (400V/470uF/105°C) after a 220VAC bridge rectifier in a motor application. During the burn-in test (180VDC, 6A seen by the motor) with a constant ...
1answer
142 views

### Why do some electrolytic capacitors increase in capacitance with age?

All in the title really; I've been repairing music equipment for years and replace electrolytic capacitors quite often. Many times I've measured the capacitance of an old cap and it will read double ...
1answer
244 views

### Will a capacitor of 10uf 250v work as good as a cap 10uf 50v?

what is the difference between electrolytic capacitors 10uf 250v and 10uf 50v? if i connect it to my circuit with a 9v battery? will the 250v cap work? or which is the most preferred for a 9v ...
1answer
92 views

### Substition of electrolytic capacitors in surface mount applications

I understand there are advantages and disadvantages against using electrolytic capacitors over others, such as ceramic, but from what I understand the main reason of choosing electrolytic caps is ...
2answers
146 views

### Will LEDs in opposing directions be damaged?

I was trying to build a simple RC circuit that causes an LED to fade in and out. However, I have electrolytic capacitors, which means that they have polarity. If I connect a circuit as follows , is ...
3answers
234 views

### Charge discharge curve of a capacitor, Arduino

I'm trying to visualize the charge discharge curve of a capacitor with Arduino. This is my curcuit: simulate this circuit – Schematic created using CircuitLab 13 is pin 13 of the Arduino ...
1answer
274 views

### How do I decide what capacitor to use in a circuit?

I am using a voltage regulator, and to get cleaner power, the datasheet recommends using a 0.33uF capacitor. However, it doesn't say what type it wants. Stupidly, I ...
2answers
510 views

### Should I discard my inventory of old electrolytic capacitors?

I have been doing hobby electronics for more than 10 years, and some of my electrolytic capacitors are easily that age. They seem to work just fine and do not show corrosion or other visible defects, ...
1answer
159 views

### Help with figuring out asus motherboard capacitor values [closed]

I have dented capacitor on my mobo which creates short... I need to replace it but i am having tough time figuring out which one it is. First Line : FP 2nd Line : 22Dx 3rd Line : 10 1 4th line : ...
2answers
377 views

### What direction to place electrolytic caps for AC coupling?

If using polarised electrolytic caps in an amplifier circuit as shown below, Does it matter which way round I place the caps? If so, why?
3answers
2k views

### Replacing (and perhaps upgrading) bad capacitors within a speaker system? [closed]

A few months ago the volume of the left speaker of my pair of low-cost audio monitors began slowly diminishing. Every day it seemed to lose a fraction of it's normal operating volume until the speaker ...
2answers
1k views

### Why does an ideal capacitor give rise to a rectangular cyclic voltammogram (CV)?

Many scientists are interested in developing supercapacitors, which have electrolyte rather than solid dielectric between the charged plates. In the field of electrochemistry, cyclic voltammetry (CV) ...
3answers
783 views

### Diagnosing cause of electrolytic capacitor failing

I am hoping somebody could help me diagnose the cause of failing electrolytic capacitors in a circuit. The context is a charger circuit, more specifically its power supply unit: Given a diode bridge ...
5answers
1k views

### How to remove remnants of a capacitor pin?

I want to replace swollen capacitors on a motherboard. Unfortunately, when removing one of them, a fragment of a pin has stuck in the PCB: I tried to remove it using pliers, but it only made the ...
4answers
6k views

### Footprints for SMD electrolytic capacitors

Does Altium Designer Summer 09 has footprints for SMD electrolytic capacitors? If so, where can I find them? I've noticed the dimensions of these type of capacitors are given in diameter x height. ...
4answers
11k views

### Can you make a non-polar electrolytic capacitor out of two regular electrolytic capacitors?

There was some discussion on this question What are some reasons to connect capacitors in series? What are some reasons to connect capacitors in series? which I don't see as being conclusively ...
4answers
6k views

### Do electrolytic capacitors have a limited shelf life?

Do electrolytic capacitors have a limited shelf life? I would like to know for both aluminium and tantalum.
3answers
679 views

### What are markings on top of electrolytic capacitors?

I often see a marking like the following pattern on the top of radial PTH elcos. What does it mean? Is it an identification of the manufacturer?