In Reply to: Updating & Refining the " DCR " Topic posted by drlowmu on March 7, 2007 at 12:10:47:
"SMALL capacitors"You want a low Z (output impedance) power supply that can supply lot's of instaneous current. Than why not use a large capactor for the last element in the filter? Caps are voltage storage devices, and can (if large enough) supply lots of instaneous current. They need to have low ESR, of course, to well above the audio frequency range. Most "electrolytic" capacitors are rather poor in this respect.
"The rectifier doesn't matter at all-- as to DCR. It is super-active, and can address current/voltage changes rather instantaneously. BUT-- just as in the transformer-- extra current capability here is a winner, regardless of DCR."
I don't see a rectifier as an active device, in the sense that there is no feedback from input to output. A rectifier is essentialy a non linear resistor (low ohms in one direction and very high ohms in the other) that appears in series with the transformer winding. Is a resistor an active device? No ...
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Follow Ups
- I don't get it ... - mikeyb 14:00:11 03/07/07 (14)
- The problem with large capacitors - JLH 05:00:00 03/08/07 (13)
- You want rapid response , , , - Ray Moth 12:36:36 03/08/07 (0)
- Re: The problem with large capacitors - rdf 10:26:55 03/08/07 (0)
- I gota think about this ... - mikeyb 06:58:43 03/08/07 (9)
- Something to think about ... - danlaudionut 17:16:35 03/08/07 (6)
- Re: Something to think about ... - rdf 10:50:04 03/09/07 (1)
- Re: Something to think about ... - danlaudionut 15:15:59 03/09/07 (0)
- I don't buy it. - arend-jan 05:44:28 03/09/07 (3)
- Re: I don't buy it. - danlaudionut 06:09:21 03/09/07 (2)
- Re: I don't buy it. - arend-jan 14:05:39 03/09/07 (1)
- Re: I don't buy it. - danlaudionut 15:32:01 03/09/07 (0)
- ..... think Dynamic, not Static - drlowmu 07:28:42 03/08/07 (1)
- Huh? - mikeyb 10:06:03 03/08/07 (0)
- JLH gets it good !!! - drlowmu 06:49:36 03/08/07 (0)