In Reply to: ESR & capacitance linearity posted by 13th Duke of Wymbourne on September 22, 2024 at 15:22:52:
Yes, the current flow of a capacitor depends on its impedance. And yes, capacitive reactance aka voltage changes in circuit caused by capacitors changes with frequencies. And yes, impedance can match capacitance this is called the capacitors resonant frequency. Which is something we do not have to worry about in a passive crossover. And yes, ESR is frequency dependent. and yes, voltage coefficient of capacitance or VCC is a product of the dielectric material used so a metalized film capacitor will have a lower VCC than electrolytic and a metal film capacitor will have a lower VCC than a metalized film.
Thankfully we do not have to pay attention to any of this when designing passive crossovers. As speaker designers we just worry about what capacitors fit with our budget. In a commercial design we need to worry about staying on budget to keep production cost low. And in the DIY world we just buy the best we can afford and call it a day and hopefully be happy and thankful for what we have.
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Follow Ups
- RE: ESR & capacitance linearity - seancuster71@gmail.com 19:37:59 09/22/24 (0)