would the attached be classed as low leakage, or would it need to be less.
i have a couple of 1uf caps in an amp im working on that are below the threshold of what is stated in the spec(reading around 0.25uf) and need to replace them.
the drawing denotes them as low leakage, so i need to know if these would be suitable
just as a note what would be classed as low leakage for my future reference many thanks
i have a couple of 1uf caps in an amp im working on that are below the threshold of what is stated in the spec(reading around 0.25uf) and need to replace them.
the drawing denotes them as low leakage, so i need to know if these would be suitable
just as a note what would be classed as low leakage for my future reference many thanks
What is Capacitor Leakage Current and How to Reduce It
Its usually applied to electrolytic capacitors , at that value (1uF) I would always install film capacitors especially polypropylene, others might have their own favourite type of film capacitor in audio.
Film capacitors would be classed as low leakage in comparison to electrolytic like Teflon/polypropylene/polystyrene.
Its usually applied to electrolytic capacitors , at that value (1uF) I would always install film capacitors especially polypropylene, others might have their own favourite type of film capacitor in audio.
Film capacitors would be classed as low leakage in comparison to electrolytic like Teflon/polypropylene/polystyrene.
An example. It also helps to use a higher than necessary voltage rating.
https://www.mouser.com/datasheet/2/293/e_ukl-1919114.pdf
https://www.mouser.com/datasheet/2/293/e_ukl-1919114.pdf
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C401 & C403----BIN the electrolytics at those low values and fit Film Capacitors they are directly in the signal path at the input .
No I don't agree with D.Self and I am not about to change that opinion.
No I don't agree with D.Self and I am not about to change that opinion.
Nichicon defines low leakage as "After 1 minute (for case size 10 = 12.5 or smaller) or 2 minutes
(for case size 10 = 16 or larger) application of rated voltage at 20°C, leakage current is not more
than 0.002CV or 0.2 (µA) whichever is greater."
Other mfrs may differ. You would have to analyze the circuit to determine how much leakage is acceptable.
Certainly a good film type would be sufficiently low in most cases, if its physical size fits.
(for case size 10 = 16 or larger) application of rated voltage at 20°C, leakage current is not more
than 0.002CV or 0.2 (µA) whichever is greater."
Other mfrs may differ. You would have to analyze the circuit to determine how much leakage is acceptable.
Certainly a good film type would be sufficiently low in most cases, if its physical size fits.
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Yes, if you use electrolytic types. Film types are not polarized.
Polarization of electrolytic capacitors is a limitation, not a feature.
Polarization of electrolytic capacitors is a limitation, not a feature.
A capacitor in a circuit has a function. Being polarized is a limitation, not a feature.
A nonpolar (unpolarized) film capacitor can serve just as well if not better, provided that
its larger size and higher cost is acceptable.
Electrolytic capacitors are used primarily where their limitations (high leakage, loose tolerance,
poor lifetime, poor reliability) must be tolerated for various other reasons (small size, low cost).
As you have found, electrolytic types have poor reliability. Film types would not have done this.
A nonpolar (unpolarized) film capacitor can serve just as well if not better, provided that
its larger size and higher cost is acceptable.
Electrolytic capacitors are used primarily where their limitations (high leakage, loose tolerance,
poor lifetime, poor reliability) must be tolerated for various other reasons (small size, low cost).
As you have found, electrolytic types have poor reliability. Film types would not have done this.
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Why would you want to use polyester when other film types are technically superior to it ?
My comment about D.Self wasn't aimed at you Poundy its a difference of opinion between two groups of people.
My comment about D.Self wasn't aimed at you Poundy its a difference of opinion between two groups of people.
How much room is available for the new part? Polypropylene film is preferred in most cases,
but such a part will be larger in physical size than an electrolytic type. It may be necessary
to use an electrolytic just because of the space available on the board.
but such a part will be larger in physical size than an electrolytic type. It may be necessary
to use an electrolytic just because of the space available on the board.
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The problem with fitting film types is that you probably will not get them to fit the board neatly, not if the originals have a 2.5mm lead pitch.
Tbh I would be totally happy to fit good commercial quality electrolytics as was originally fitted.
Tbh I would be totally happy to fit good commercial quality electrolytics as was originally fitted.
The original question was because the old caps were low leakage types, and he didn't know what to do.
He also thought that polarized capacitors were necessary, to function properly in the circuit.
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I use Kemet R82EC4100Z370K or Epcos B32529D1105J as 5mm pitch replacement for vintage electrolytics on the signal path. They aren't the best audio capacitors, but still better than electrolytics while still fitting on most of the boards. Wima MKS02/1.0/50/20 have the tight 2.5mm pitch.