All Questions
Tagged with electrolytic-capacitor capacitor
189
questions
0
votes
1
answer
120
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capacitor uF values question
Can I put a bunch of 220 uF caps together to get a higher uF value? or is it best to replace with the same value of cap.
-1
votes
2
answers
445
views
Non polarized capacitor uses
I am fascinated with capacitors. The ones I am most familiar with are the polarized capacitors. I know how they work and what to use them for. There is one capacitor though that I am not familiar with....
- 11
6
votes
3
answers
4k
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Why are some capacitors bent on old boards?
I've noticed that on older boards some of the electrolytic capacitors don't sit up straight, they're not totally vertical. I wonder why this happens, is it because they were soldered by hand and the ...
0
votes
3
answers
2k
views
Can we use a capacitor with battery to fast charge it?
Consider this. Many capacitors connected in parallel to an input line, those capacitors are in series connected to battery. Whenever we need to charge, we plug in adapter that charges the capacitors. ...
8
votes
1
answer
951
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Why do these capacitors have an additional plastic block around them? What kind of capacitor is this?
Just saw these type of capacitors for the first time and I'm curious :
Why do they have this additional block of plastic around them? Some kind of shielding?
Is there some specific reason they didn't ...
- 1,282
1
vote
1
answer
1k
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Are capacitor vents safe to touch?
I couldn't find this information anywhere.
Every tutorial on how to safely handle a capacitor tells you to absolutely avoid touching the capacitors leads, and to grab a capacitor by its insulated ...
- 59
-1
votes
1
answer
361
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How to size a capacitor?
I want to design a PCB with some ICs and I've read that it's recommended to use decoupling capacitors to filter out voltage spikes. There are three ICs on the PCB: Arduino NANO, nRF24l01 module and ...
2
votes
0
answers
55
views
Question about series-connected (pseudo-nonpolar) electrolytics
Another Q&A on this site ("Ceramic caps vs electrolytic. What are the tangible differences in use?") contains good information on capacitors in general, including parameters I wasn't ...
- 31
2
votes
1
answer
122
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Unexpected (unintended) capacitor charging explanation
Please first consider the below schematic. It is the balanced output part of an existing hifi preamp. Not my design, it's confidential so I can only reproduce the relevant part.
Things that might be ...
- 1,023
0
votes
3
answers
340
views
Fake ELNA electrolytic smd capacitor
Few years ago I bought "pack of SMD capacitors", they came only with information about capacitance and voltage. Now I need to use one of them, but I have trouble with find information what ...
- 411
9
votes
3
answers
2k
views
Can an electrolytic capacitor withstand 0.1 V reverse polarity?
Let’s start the question with a brief description of my application.
I am trying to attach a headphone jack with a detect pin to a RDA5807 IC based FM radio project. I am using a separate ...
- 183
1
vote
1
answer
98
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Why could my electrolytic capacitor have current but not my parallel plate capacitor?
This is for a science project. I have built my own electrolytic capacitor with aluminum foil and paper dielectric soaked in salt water solution. My parallel plate capacitor is simply aluminum foil ...
- 107
2
votes
2
answers
631
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Can my circuit be submersed in oil?
I've been asked if a design of mine can be immersed in transformer oil. (And still function properly!)
The circuitry is mostly SMT Qs, ICs, Rs, ceramic Cs all of which I think are OK but I'm unsure ...
- 45
0
votes
3
answers
675
views
Switched power supply capacitors
Lots of electronic hardware gets problems its psu and more specificly: with the electrolytic capacitors.
How do old capacitors usually affect the capacitance of that electrolytic capacitor?
What ...
- 874
0
votes
1
answer
68
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Decoupling capacitors - placement close to DC output
I have a general question regarding the placing of decoupling capacitors.
Example at DC Vout of SMPS or LDO regulators. Does it really matter which capacitor out of 100nF, 1nF and 10uF is placed ...
- 59