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Something to think about ...

Mikey

>> It's not obvious to me why a large cap cannot deliver
>> energy to the load as quickly as a small cap.

Just listen to a large vs small cap in a coupling situation.
The larger cap does bass better but the smaller cap does
high frequency much better because it is quicker.

>> A large cap has more stored energy than a small cap -
>> why would it not be able to deliver more energy (current)
>> to the load at the same speed as a small cap?

Internal resistance would be my guess.
Why would a Corvette be slower off the line than a Honda?
The Corvette has higher power and much better specs but
also more vehicle weight and more engine mass to accelerate.
Choosing the right cap size is a matter of compromise.
Speed vs ripple reduction.

>> That means, I contend, the the effective output impedance
>> of the power supply at a given frequency decreases with
>> increasing capacitance (of the last cap).

Assuming that the caps have the same internal resistance.
Which they don't - unless one goes to a better cap for
bigger values which would get very expensive very quickly.

DanL


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