I've just read a blog about charging coupled capacitors and was wondering if anyone has further information on the subject?
Kingfisher
Kingfisher
I think your question is too vague to get a sensible answer. Could you provide a link to the blog and/or summarize in a bit more detail what it was about?
So it's about using series connections of capacitors with a DC bias instead of a single unbiased capacitor in passive crossover filters. I could imagine that will help keeping the dielectric of electrolytic capacitors in shape; it is well-known that electrolytic capacitors that have had little or no voltage across them for decades have a much increased leakage current that disappears again when you slowly charge (reform) them.
I've never heard about DC bias reducing the dielectric absorption of film capacitors, though. As far as I know, dielectric absorption is an almost linear process that doesn't get worse when signals are close to zero and doesn't improve when the signals are kept far away from zero. In fact the only method I know to reduce dielectric absorption is to use capacitors with a different dielectric that absorbs less.
I've never heard about DC bias reducing the dielectric absorption of film capacitors, though. As far as I know, dielectric absorption is an almost linear process that doesn't get worse when signals are close to zero and doesn't improve when the signals are kept far away from zero. In fact the only method I know to reduce dielectric absorption is to use capacitors with a different dielectric that absorbs less.
Capacitors are routinely used at microvolt levels without any DC bias in RF circuits. If they suffered from zero crossing distortion, that shouldn't work.
Regarding piezoelectric effect: ceramic class 2 capacitors have piezoelectric effect, but they are such poor capacitors that they should not be used in crossover filters at all.
Regarding piezoelectric effect: ceramic class 2 capacitors have piezoelectric effect, but they are such poor capacitors that they should not be used in crossover filters at all.
References talk too much and offer too little, if anything at all.
Just a couple unfounded assumptions, zero measurements, borderline BS/snake oil
Their best effort is:
Best case, a non solution to a non problem.
Just a couple unfounded assumptions, zero measurements, borderline BS/snake oil
Their best effort is:
Besides showing zero proof, he uses the red flag BS words, so beware!!!
Best case, a non solution to a non problem.