Heres a good one, anyone know what surge (in amps) can be expected on a very low impedance low reactance load using 10000 uf 450 volt caps seriesed versus 6000 uf 450 volt caps seriesed with supply voltage of 300 vdc? The caps have fairly low ESR and low ESL but I have no way of checking
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Re: Cap surge current
Let me clarify that the caps are placed in a switch mode power supply type application -
Re: Cap surge current
Here is a sch of caps and they are actually parallel my bad https://www.badcaps.net/forum/attach...3&d=1364173402Comment
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I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
Hello
this is a rio volt portable mp3 cd player main board
accidentally its 120ac power adapter was used with 220ac
the unit worked for few seconds and then off and never worked again
it normally takes 3volts batts or 4.5dc from the adapter socket
in the picture I believe this is the main power IC (4 channels)
it is the only area in the board that barely gets warm after few minutes
drawing 0.4 watts in total continuously
i did checked all the caps on the board including these caps around the IC
nothing is shorted... -
Hello,
First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.
I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.
I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
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I have a battery operated tab welder and the battery does not have enough current for the battery tab welder because after about 30 welded it does not have the same current output it voltage has gone down by at least 0.500 volts or maybe a more than that
I can fit 21700 battery cells in the enclosure it is very tight fit for four of them that are 35 amp high current capacity 35X4=140 high current output this should work a lot better than what is installed right now
I tested the battery cells there are installed right now and they are testing good with no issues that I... -
Hello!
I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.
The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.
I have studied the board and...
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