All Questions
Tagged with electrolytic-capacitor capacitor
189
questions
0
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1
answer
34
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Energy stored in a capacitor with dielectric
This is a problem from a book. The exact words of the problem are below:
A condenser of 1 µF contains titanium oxide (\$TiO_2\$) as a dielecric with \$ε_r\$ = 100. For an applied D-C voltage of 1000 ...
- 701
0
votes
1
answer
94
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Why are there capacitors in series in this AC/DC converter?
In a circuit with an AC/DC converter that supplies 12V and then only 11.4V because of a diode (D16), I have found capacitors in series (C33 and C38, each 100µF 35V.) That makes no sense to me since ...
- 456
0
votes
1
answer
68
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Cyclic Voltammetry for a Capacitor - Positive Current, Potential is decreasing?
In the boxed red region, why is the potential decreasing when the current is still positive? To my understanding, when the current is still positive (i.e. not changing direction), the capacitor will ...
- 1
-3
votes
3
answers
126
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Blowing up capacitors with a 9v battery [closed]
Hello, I have a 9V battery I would like to blow up some capacitors with; currently I have 6.3v 180uF capacitors that don't seem to blow up at least in a good time(I'm aiming for <5 seconds), they ...
- 43
1
vote
1
answer
89
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Electrolytic 3-lead capacitor
I have a 3-lead capacitor that I'm having a hard time identifying. It is from an old Lafayette PF-30 receiver. I don't have schematics or a manual.
It has a high squeal when turned on, and my first ...
- 13
1
vote
1
answer
194
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How does temperature affect ripple current parameter in electrolytic capacitors?
A maximum ripple current declared, for example, at 100 kHz and at a temperature of +105 ℃ for an electrolytic capacitor, if estimated at a temperature of +85 °C, how much does it increase? What order ...
- 105
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1
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144
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Can you replace ceramic or tantalum capacitors with aluminum electrolytic capacitors?
I have a question about the hookup for my 12VDC to 5VDC step down module - the K7805JT-500R3.
It states in the datasheet that ceramic capacitors are what can be used but it also states that tantalum ...
- 797
0
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1
answer
87
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Calculate capacitor charging constant time connected to battery and boost converter
I know the formula to calculate the constant time for capacitor is t=RC and for full charge t=5RC.
In the following example there is not resistor in the circuit but of course we are not in the ideal ...
2
votes
3
answers
573
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Formula for calculating capacitor balance resistor values
The following formula is generally used for calculating balance resistor values used for overvoltage protection of capacitors in series when the individual capacitor voltage ratings are below the ...
- 206
5
votes
2
answers
805
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Voltage drop due to leakage current in capacitors in series
When capacitors are connected in series in a DC circuit, the voltage drop across individual capacitors at and immediately after the initial charging period is inversely proportional to the individual ...
- 206
4
votes
2
answers
1k
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Footprint for Electrolytic Capacitor
I plan on using this capacitor on my project:
https://datasheet.lcsc.com/lcsc/2209011730_KNSCHA-RVT330UF50V167RV085_C5155333.pdf
This is an electrolytic capacitor (this means it has polarity.).
The ...
- 1,369
1
vote
1
answer
99
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Why does this Zenith Phonograph schematic separate electrolytic and fixed capacitors
I'm currently in the process of restoring a 1960's phonograph made by Zenith. My plan is to replace all the capacitors among other things. I have the original schematic, purchased from Sam's Technical ...
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11
votes
1
answer
1k
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Do electrolytic capacitors lose lifetime during soldering in reflow oven?
Electrolytic capacitors service time is based on maximum operating temperature, among other things. When they are inside an SMD soldering oven, the temperature increases to over 375°C. Most of the ...
- 2,519
2
votes
0
answers
72
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Do I need to insulate the case of an electrolytic capacitor from ground? [duplicate]
I'm designing a motor controller, and I'm trying to understand if I need to add insulation between the case of the bulk input capacitors and the grounded aluminum heatsink. I know that relying on the ...
- 237
1
vote
1
answer
403
views
Identifying a vintage capacitor
This is inside an Allen Wales (Model 9E) adding machine. It was manufactured in the late 30s or maybe sometime in the 40s from what I've read. There are notes from a technician scratched on the inside ...
- 11
1
vote
1
answer
108
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How to visually distinguish metal film and ceramic capacitors (leaded)?
This question only involves the leaded components.
Electrolytic capacitors are each to recognize since they are usually in cylindrical cans. However, I am not sure about distinguishing the other two ...
- 749
0
votes
1
answer
86
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Verifying my capacitor calculation
I just received in the mail a 0-60 V power supply that has the capability of outputting 24 A. I needed a high-voltage, high-current power supply to help design and test high-powered LED arrays for ...
22
votes
7
answers
6k
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Why are electrolytic capacitors still in production?
What are the advantages of using electrolytic capacitors?
I know in the past electrolytic capacitors would have more capacitance, but with Multi-layer ceramic capacitors (MLCC) they seem completely ...
2
votes
2
answers
280
views
How important is capacitor life span? [closed]
As above.
I am deciding between 3 capacitors. I need 6 capacitors arranged in 2 banks with 3 capacitors in parallel each for a V+/V- unregulated power supply for an audio amplifier.
Capacitor 1: ...
- 409
3
votes
1
answer
1k
views
Connecting electrolytic capacitors in series to increase maximum voltage
I need to use a capacitor in a DC circuit where it would store somewhat higher voltage (hundreds of volts). The cheapest way to do that (in my case) is to connect multiple electrolytic capacitors in ...
- 248
0
votes
1
answer
211
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Electrolytic capacitor with zero bias
This is a very common trick used in many audio amplifiers with an op amp topology to minimise the output offset by creating a unity gain for DC. Usually the electrolytic capacitor sits on the ground ...
- 613
0
votes
4
answers
474
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Is it possible to replace the electrolytic capacitor in a full wave rectifier bridge with a ceramic capacitor?
Why do we use electrolytic capacitors in full wave rectifier bridges? Is it because we can have huge capacitance with electrolytic type or is it because the output is DC voltage where polarity is a ...
- 19
1
vote
0
answers
133
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Tantalum capacitor at low temperatures
What could happen to a solid tantalum capacitor that operates below the lower temperature range defined by the manufacturer (-55°C)?
From my understanding, there would be a performance issue with ...
- 11
3
votes
2
answers
542
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Electrolytic capacitor and AC
I'm doing an experiment to investigate the relationship between frequency and capacitance. The experimental setup is to connect an aluminum electrolytic capacitor to a function generator and use an ...
- 105
1
vote
4
answers
2k
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Can I substitute a capacitor with the same rated capacity and voltage but a lower inductance and higher rated ripple current for a mobo repair?
I have an early to mid 2000's motherboard that I am trying to restore. It looks to be mostly in good condition but a blown radial electrolytic capacitor might be causing trouble. From the placement of ...
- 21
0
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1
answer
219
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ESR of aluminum electrolytic capacitors [closed]
Is there any way to calculate the ESR of electrolytic capacitors for high frequencies?
In aluminum electrolytic capacitor datasheets, the dissipation factor is given with low frequency(100Hz-120Hz) ...
- 319
2
votes
3
answers
141
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What is the result of wiring an electrolytic cap in series with a ceramic when parallel was intended?
FINAL UPDATE A reassessment of my power consumption has led me to the solution to all of my problems. I picked up a 5V, 5A power supply (giving me plenty of overhead), reassembled my project, and it ...
- 123
1
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1
answer
3k
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How to Calculate Ripple Current?
How do I calculate the ripple current a capacitor will experience for a given circuit?
For example, let's say I have a smoothing capacitor on the output of a full-wave bridge rectifier (120VAC, 60Hz) ...
- 868
12
votes
2
answers
3k
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Which manufacturer's logo is this?
I'm trying to identify the manufacturer (and hopefully part number) for these capacitors.
My guess is they're standard aluminium electrolytics, rather than something fancy like alupoly, but I can't ...
- 10.8k
0
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4
answers
639
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What is the purpose of these different-value capacitors? [duplicate]
I guess I am trying to figure out why we wouldn't just consolidate these into one single 22.11uF capacitor.
My initial understanding was that each capacitor was better at filtering certain frequencies,...
- 868