Hi,
Someone tell me that the AC cap (e.g. for motor starting etc) can be used in audio amp as a normal DC cap.
Is it possible?
If yes, how to calculate the votage spec?
(e.g. AC 500V cap = DC XXXV?)
Thank you for your help.
Someone tell me that the AC cap (e.g. for motor starting etc) can be used in audio amp as a normal DC cap.
Is it possible?
If yes, how to calculate the votage spec?
(e.g. AC 500V cap = DC XXXV?)
Thank you for your help.
Hi TunaFish,
I have used AC caps in DC circuits using: AC V=DC V*1.4
They are still working.....😉
Cheers,
I have used AC caps in DC circuits using: AC V=DC V*1.4
They are still working.....😉
Cheers,
Go ahead and try it.
I hear alot of people use them. Shouldn't be any problem with breakdown, as dh says. Sonic qualities will be interesting, depending on type, oil, pp, terminations etc.
Good luck.
I hear alot of people use them. Shouldn't be any problem with breakdown, as dh says. Sonic qualities will be interesting, depending on type, oil, pp, terminations etc.
Good luck.
I use a lot of GEC paper in oil AC caps in my projects.
They are rated 370V AC and I´ve run them up to 480V DC without problems.
They are rated 370V AC and I´ve run them up to 480V DC without problems.
The only caps I use now are GE or ASC PP in oils for the PSU.
Pete Millett made a post on the Tube DIY board at Audio Asylum a while back after he'd emailled ASC for their opinions on the safe DC working voltages from their AC cap ratings. The 1.414 John mentions above was about the minimum in most cases.
Pete Millett made a post on the Tube DIY board at Audio Asylum a while back after he'd emailled ASC for their opinions on the safe DC working voltages from their AC cap ratings. The 1.414 John mentions above was about the minimum in most cases.
dhaen said:
You've got that the other way around:
DC V = AC V * 1.414
Rectified DC voltage is the square root of 2 * RMS AC voltage.
Hallo,
I have some of those AC use only paper in oil caps. They are are marked outside with the warning against PCB use. What does that mean? If we move the cap ouside the chasssis, then it's safe then?
My point is: if you can put or fix the cap on the PCB careful, then why it is dangerous?? Leakage? Very unlikely, right??
cchen
I have some of those AC use only paper in oil caps. They are are marked outside with the warning against PCB use. What does that mean? If we move the cap ouside the chasssis, then it's safe then?
My point is: if you can put or fix the cap on the PCB careful, then why it is dangerous?? Leakage? Very unlikely, right??
cchen
Wait a minute!
Those old schematics around 50's use a lot of this type of capacitor as the first line defence against high voltage in power-filtering!
But, how do they sound??
😱 😱 😱
Those old schematics around 50's use a lot of this type of capacitor as the first line defence against high voltage in power-filtering!
But, how do they sound??
😱 😱 😱
Note this is normally valid for 50/60 Hz. For other frequencies you must consult the datasheet of the cap. If you take 1 MHz and 100 V and use a 100 V AC capacitors it will probably die!schmad said:
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