100VA transformer into 2 Farads to make 5VDC! What rectification?
Personally, I am much more interested in the capacitor technology!
2 Farads is comparable to DS Audio’s higher-end Equalizers. With the custom capacitors they use, this much capacitance weighs about 20-kgs. The less the separation between the capacitor 'plates', the greater the capacitance but also the greater the risk of leakage and premature failure. Mr. Nixie claims similar capacitance in a much lighter package, if I am reading the specifications correctly.
As for the transformer rating, their most expensive Equalizer uses three transformers, but I have not been able to discover their VA rating.
My SoulNote Equalizer scrapes by with
A 260VA non-impregnated large toroidal transformer is incorporated into the phono equalizer. Darlington ripple filter circuits, fast recovery diodes, and ten parallel 1,000μF filter capacitors combine in a non-NFB power supply
260-VA, on paper at least, is ten times overkill for a unit that consumes 24-Watts, given that Watts approximates VA.
Earlier in this thread you posted calculations giving the capacitance required to smooth various output voltages. With respect, your formulae did not factor in the acceptable ripple level on the output. Adding more capacitance asymptotically reduces ripple and in that sense you are only subject to the law of diminishing returns in terms of cost, weight, volume.
Also, the more current extracted from the power supply, the greater the ripple will be. So overkill is good.
*Non-NFB means negative feedback is not used

