Hi,
I tried to find more about bipolar lytic caps lifespan and loudspeakers because if finding some with capacitance that raise despite fall after 30 years ! Which are modern caps technology as made in the 80s or 90s.
Had already good answers about that and of course the question is not about changing it r not but more about understanding
I found ater some googling than a lytic cap should be sized around 50% to 75% more voltage than the circuit allows for the best lifespan because :
after long time caps spec with undersized voltage rating loose their efficienty, mainly ESR then see the capacitance decreasing. Ok it is known.
But I also read than oversized voltage ratting of caps above the 50 to 75% oversizing rule may introduce with time an increase of the capacitance !😱
I saw no reference about ripple limits & caps life span in this testimonial though... But if speaking about voltage and speaker filters : how one can size the voltage of their bipolar caps ??? Same voltage seen when a cap is in serie in front of a driver and when it is in // with it before it sees the voice coil - plus and minus shunt position in the bass and band pass bass section, impedance correction network- ...
Now about the raw and smooth etching and ESR on lytics bipolar caps as their dielectric material. Is anyone aware of solid type dielectric with some brands about their lytic bipolar caps ? Are they use also water to reduce the ESR of their dielectric gel in their best ESRed caps (smooth foil are said to be 0.025 ESR only but is it due just because the smooth foil vs he rough foil they use for high capacitance caps ?
Rephrasing it: because best ESR bipolar caps would have weter dielectric cause watered means faster drying and gasing so reduced lifespan (of the ESR and capacitance stability) ?
Aware of solid dielectric bipolar lytic caps on the market ?
For the story of it I bought some bipolar caps from Mundorf and JB in a famous online speakers german shop... the capacitance tolerance of the Mundorf raw foil Ecap (10 uF) was up to 12% to 17% instead the 5% advertised. JB was nearerof its 5% with 6% to 9% uper capacitance on a high 100 % value and 1% on a 470 uf cap
sorry, a little metaphysic question, in real life one would go active filter or spend for film caps in their filter what ever the capacitance (if the wallet is ok).
Uh, I'm going to test a speaker filter with circuit polarized caps I measure myself because on hands by putting two in serie in a + - - + arrengment hopping the ripple curent limit is ok for a speaker (yes I know such caps have a much higher ESR... but that's for tests purpose)
I tried to find more about bipolar lytic caps lifespan and loudspeakers because if finding some with capacitance that raise despite fall after 30 years ! Which are modern caps technology as made in the 80s or 90s.
Had already good answers about that and of course the question is not about changing it r not but more about understanding
I found ater some googling than a lytic cap should be sized around 50% to 75% more voltage than the circuit allows for the best lifespan because :
after long time caps spec with undersized voltage rating loose their efficienty, mainly ESR then see the capacitance decreasing. Ok it is known.
But I also read than oversized voltage ratting of caps above the 50 to 75% oversizing rule may introduce with time an increase of the capacitance !😱
I saw no reference about ripple limits & caps life span in this testimonial though... But if speaking about voltage and speaker filters : how one can size the voltage of their bipolar caps ??? Same voltage seen when a cap is in serie in front of a driver and when it is in // with it before it sees the voice coil - plus and minus shunt position in the bass and band pass bass section, impedance correction network- ...
Now about the raw and smooth etching and ESR on lytics bipolar caps as their dielectric material. Is anyone aware of solid type dielectric with some brands about their lytic bipolar caps ? Are they use also water to reduce the ESR of their dielectric gel in their best ESRed caps (smooth foil are said to be 0.025 ESR only but is it due just because the smooth foil vs he rough foil they use for high capacitance caps ?
Rephrasing it: because best ESR bipolar caps would have weter dielectric cause watered means faster drying and gasing so reduced lifespan (of the ESR and capacitance stability) ?
Aware of solid dielectric bipolar lytic caps on the market ?
For the story of it I bought some bipolar caps from Mundorf and JB in a famous online speakers german shop... the capacitance tolerance of the Mundorf raw foil Ecap (10 uF) was up to 12% to 17% instead the 5% advertised. JB was nearerof its 5% with 6% to 9% uper capacitance on a high 100 % value and 1% on a 470 uf cap
sorry, a little metaphysic question, in real life one would go active filter or spend for film caps in their filter what ever the capacitance (if the wallet is ok).
Uh, I'm going to test a speaker filter with circuit polarized caps I measure myself because on hands by putting two in serie in a + - - + arrengment hopping the ripple curent limit is ok for a speaker (yes I know such caps have a much higher ESR... but that's for tests purpose)
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