Re: Cap Datasheet Depot
It seems Samwha Capacitors missed...
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Re: Any more info on counterfeit Nichicons?
maybe someone has seen which capacitors brand have such a bottom with circles ?
...Last edited by AleXis6; 09-13-2023, 04:06 AM.
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Re: Fake Nichicon 100uF 450v GN (M)
when it was produced?
based on the current datasheet 40*22 is size for 100uF*500V
but I never seen Nichicon with such top picture...Last edited by AleXis6; 09-04-2023, 01:42 AM.
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Re: Fluke 289 bad supercapacitor replacement repair
quick measurement - voltage of the supercapacitor (Panasonic) in FLUKE 289
HH:MM V
00:00 - 3,223
00:08 - 3,207
00:22 - 3,14
01:00 - 2,973
01:32 - 2,833
02:00 - 2,715
02:31 - 2,593
03:00 - 2,484
03:20 - 2,406
Date &time have been saved after 210 minutes
after about 360-400 minutes Date&time was lost
The minimum required voltage I think in a range 2-2.4 VLast edited by AleXis6; 07-14-2023, 06:19 PM.
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Re: Fluke 289 bad supercapacitor replacement repair
who tested after what minimum voltage on the capacitor Fluke lost date and time settings?
1 year ago I replaced the capacitor and yesterday was surprised that after 6 hours date&time settings was lost. Now I measure the minutes/voltage but I have no idea what is the minimum required voltage
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Re: Calculating ESR from tan delta -- tan delta's dependence on capacitance
an example impedance vs ESR (I found a datasheet with both)
[url=https://ibb.co/dBPbhjJ][/url]Re: Calculating ESR from tan delta -- tan delta's dependence on capacitance
an example impedance vs ESR (I found a datasheet with both)
[url=https://ibb.co/dBPbhjJ][/url]
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Re: Picking caps for Antec SU-380
ripple current :
1,13A your Hitachi
1,1A Nichicon LGU...
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Re: Caps dimensions
please read the datasheet about working hours.4
Within the same series, often a larger diameter means more operating hours
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Re: Fake polymers?
but polymers without any print are available from aliexpress...
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Re: purchasing caps from aliexpress
LCSC usually selling capacitors which produced 1-3 may be 5 years ago,
After that they provide huge discount (like 30-70%).
Aliexpress has series which produced 20 years ago.
About how detect read [URL="https://www.badcaps.net/forum/showthread.php?t=99791"]this topic[/URL] it is easy for Nichicon, Rubycon and some another brandsRe: purchasing caps from aliexpress
LCSC usually selling capacitors which produced 1-3 may be 5 years ago,
After that they provide...
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Re: purchasing caps from aliexpress
yes, remember not always
and capacitors are usually very old.
this shop also offers capacitors by weight - 500g, 100, 200
so You can try this just to receive different ones for non important repairs - but see feedback pictures before.
look also these:
CHEN-components Store
JiaGuan's Store
these 2 shops provide periodically good coupons for followers and from my point of view they have better capacitors than yingfu
last order from Chen -I received Nichicon audio series 2019-2020 years...Last edited by AleXis6; 11-19-2022, 11:02 AM.
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Re: purchasing caps from aliexpress
you should have download datasheet and usually ESR not described for audio capacitors.
and your simple meter uses not standard frequency for esr calculation.
standard I mean - 100 kHz, 120 Hz...
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Re: purchasing caps from aliexpress
I bought several times from this shop, they also represented at ebay.
you have a chance but not always they sent genuine caps.
the second problem genuine might be very old and seems like a garbage...
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Re: Does higher voltage tolerance mean more robust?
If you change within the same series, most likely yes.
Look at the datasheet, it usually specifies the runtime at operating voltage and temperature and this value in hours often correlates to the size of the capacitor.
i.e. if you put a capacity of the same series at a higher voltage, its size is probably larger and it is likely to indicate more hours of failure (but not always).
see the attached picture of Nichicon HE datasheet, it even describes that higher voltage -> more working hours...
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Re: Ultra low ESR. Much confusion!
usually datasheets provide information about ESR at 100kHz, sometime at 120 Hz.
but such meters use another frequency - so it is not possible to compare their measures with the datasheet for electrolytic capacitors...
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Re: Fluke 289 bad supercapacitor replacement repair
[url=https://ibb.co/8dFQxZm][/url]
The diameter is close to the maximum possible.
The height is normal and might be even greater.
negative leg has been cut.
But the current consumption has increased in sleep mode from about 10 μA to 60 μA (my another multimeter is not very accurate in this mode).
Also I performed a test before soldering- charge the supercapacitor to 3.0V and keep it for 24 hours, the voltage after that was 2,24V.
I found similar supercapacitor...
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Re: Fluke 289 bad supercapacitor replacement repair
I have found a simple approach how to calculate the capacitance.
Charge the supercapacitor through a 1kOhm resistor and measure the time in seconds when the U on the supercapacitor is 0.6331 of the load voltage.
Then multiply the number of seconds by 1000 -> mF
Load 3.0V -> 0.6331*3 = 1.8993V
After 255 seconds the U on the supercapacitor has become 1.8993V, so the capacity is about 255*1000=0.255F this is 23% lower than the nominal I bought 0.33F (+-30%)
[url=https://ibb.co/PGtZpnr][/...
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