Re: What to replace an unobtainable bipolar elctrolytic?
it should be ok to increase to a few uF without major issue, if a design is critical to excess coupling cap capacitance or inrush charge up time constant, then film cap would have been chosen instead.
I have a build mic peramp that got a 220uf coupling cap between 2nd~3rd opamp stages, 5k ohm resistor to ground in 3rd stage, takes me 2 senconds to settle when powering on before recording, all are fine....
bestsystem
Senior Member
Last Activity: 09-05-2023, 01:30 AM
Joined: 05-11-2011
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Re: What to replace an unobtainable bipolar elctrolytic?
get nichicon muse BP , 1.0uf, 2.2 or even 4.7uf won't go wrong for coupling.
According to audio circuit books by Douglas Self, reasonably oversized coupling electrolytic caps give less distortion.Leave a comment:
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Re: Trying to locate this safety cap
May be this is a cost down safety cap without proper certification approval, a sign of Chinese cost down product.Leave a comment:
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Re: testing voltage of unknown SMD caps
should we expect a test that will determine the max voltage by blowing / breakdown of the MLCC?Leave a comment:
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Re: Surveillance receiver capacitor?
crystals seldom fail, especially the pins re not contaminated with glueLeave a comment:
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Re: Nichicon audio capacitors UFS on Ali
lots of fakes, a weak safeguard is to compare the size and rating with datasheet.
fake bottom bungs have a sense of crudeness, sometimes embossed with ◎Leave a comment:
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Re: what brand caps is this? RM
only Samxon (Man Yue) is stable, also AiSHi does not need to be recapped often
Avoid others at all cost, I have seen them bulged even inside a modest transistor radio....Leave a comment:
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Re: Large vs small electrolytics reliability
film caps, mylar green caps and polyester caps can be short circuited internally, hm meter shown 2.xx Kohm, especially brand new from the bag.Last edited by bestsystem; 03-17-2021, 01:01 AM.Leave a comment:
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Re: HITANO Caps
Hitano is kind of a [COLOR="DarkOrange"]Taiwan[/COLOR]nese brand but manufractured in 東莞, that's commie china.Re: HITANO Caps
Hitano is kind of a [COLOR="DarkOrange"]Taiwan[/COLOR]nese brand but manufractured in 東莞, that's commie china.Re: HITANO Caps
Hitano is kind of a [COLOR="DarkOrange"]Taiwan[/COLOR]nese brand but manufractured in 東莞, that's commie china....Leave a comment:
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Re: Fake Nichicon capacitors with almost-perfect sleeve?
Also, fake caps seldom has cost adding features such as auto inserter bents, ammo drums, really special form factors or recently marketed series etc.Leave a comment:
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Re: SMD capacitor brand identification: CS
for more audio circuits, and capacitor distortion, read the books by D. Self,
Small Signal Audio Design
Audio Power Amplifier Design HandbookLeave a comment:
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Re: Fake Nichicon capacitors with almost-perfect sleeve?
Hard to judge authenticity with only a picture, try a ESR meter.
My wisdom is fake caps usually have poorly feeling, thin legs. Some premium real caps feature copper coated legs or even copper core leg, multi coatingLeave a comment:
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Re: How high does plunger come up if bad? Cornell Dubilier 23000UF
A centimeters maybe, imagine the volume ratio, perhaps there is already some atmospheric air inside during the manufacturing process.
Yours one looks normalLeave a comment:
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Re: Why would a 25V cap blow across 19V?
Or sometimes even confused SMD components and caused havoc.Leave a comment:
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Re: Why would a 25V cap blow across 19V?
I still can't identify the polarity of SMD capacitors and diodes reliably.
Got so many mishaps.Leave a comment:
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Re: Panasonic FC series - leaking? quality gone?
Another example to use GBL /low leakage current caps is memory battery backup or clock capacitor.
This capacitor is in parallel with a coin cell battery and provide energy during battery change.
Modern EL / poly caps tend to forsake the low leakage current properties. A 50ua leakage will drain a 100mah cr2025 coin cell in 2000 hours, less than 3 months, unacceptable. I need to keep it under 1ua or less.Last edited by bestsystem; 10-10-2020, 06:15 PM.Leave a comment:
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Re: Premium MLCC Capacitor Selection
Are genuine COG (C0G?) capacitors available in 10 uf+?
i have only encountered pf and nf C0Gs or NP0Leave a comment:
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Re: Panasonic FC series - leaking? quality gone?
[url]http://www.su-scon.com.tw/en/category/L.html[/url]
Su'scon (Taiwanese) catalog is interesting, clearly listing out their anhydrous caps.
They also have audio, low leakage and three types bipolar caps.Re: Panasonic FC series - leaking? q... bipolar caps.Re: PanasonicLeave a comment:
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Re: Do I want Ripple Current high or low?
some of them are rated at 100KHz and some are 120Hz, i don't know why they are not measured at the same frequency?Leave a comment:
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Re: high esr on new rubycon caps
what series is it?Leave a comment:
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