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In Reply to: RE: How do you represent your tubes in PSUD2? posted by Tre' on May 29, 2017 at 20:50:44
No, I'm definitely not talking about a supply Dennis Fraker would use. I usually use choke input critical inductance filters. I'm too tired to model and show you what I'm talking about. Maybe later....
I re-model my critical inductance choke input supply and just by lowering the last cap to 50uf the voltage dip in the first 12.5ms is 2 volts (and of course the ripple is up) and the total drop is still 4.5 volts because the DCR didn't change.
I believe that's in keeping with what you said.
So I conclude it's all about storage. The bigger the last cap the more voltage is stored and the longer it takes for that voltage to drop due to a change is current draw. The supply has a lower impedance.
When the current draw increase is sustained long enough then the voltage eventually drops in accordance with the DCR of the rest of the supply.
The DCR of the supply vs. the impedance of the supply.
I conclude that designing for a fast settling time is designing for a high impedance supply.
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I tried a few PSUD runs, and the more capacitance there is on the south end of a northbound LC supply the smaller the drop, the smaller the rise and lower is the ripple.
For PP, Class A, I have yet to see where this sounds worse than a liddle capacitor, ripply supply.
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