This is where you have to model

Posted by Russ57 (A) on September 19, 2008 at 07:12:13

In Reply to: Speed of chokes versus caps posted by Christopher Witmer on September 18, 2008 at 15:45:57:

Everything is a mix of compromises and trade offs. I understand that you are trying to get a handle on what the parts do. That is smart. Just put at least equal attention into what you need the power supply to "do". What might be right for a class AB1 push pull amp might not be best for a SET amp or a preamp. Some circuits have good PSSR and don't require the same level of filtering.

So you have to decide on the circuit first based upon what needs to be accomplished. Then you look at what that circuit needs from a power supply. Then you consider things like how much room can the power supply take up and what part of the total cost of the amp.

There is no such thing as the "best" and there is no "one size fits all " approach. If I were looking for such a thing I'd go with a large henry, low DCR, choke input supply. I like something at least 10 henry and under 50 ohms. I would use a tube rectifier (damper diodes). I would stay with a strict class A1 design. I would use motor run caps (or film caps). I'd go with a LCLCRC filter. This assumes we are talking about a power amp.

Russ

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Follow Ups Full Thread

Topic - I need to learn the ABCs of chokes & caps in power supplies - Christopher Witmer 23:57:35 09/17/08 (19)

Power supply noise issues. - Al Sekela 11:11:15 09/18/08 (0)

A big advantage for me was getting rid of electrolytic caps - Slider 09:00:23 09/18/08 (8)

RE: A big advantage for me was getting rid of electrolytic caps - Tarquineous 00:06:54 09/21/08 (7)

RE: A big advantage for me was getting rid of electrolytic caps - Slider 08:46:30 09/21/08 (6)

RE: A big advantage for me was getting rid of electrolytic caps - rick_m 09:45:12 09/21/08 (5)

not sure what you mean by outside of the chokes - Slider 10:18:52 09/21/08 (4)

RE: not sure what you mean by outside of the chokes - rick_m 20:20:34 09/21/08 (3)

It is a full wave rectifier - Slider 21:36:50 09/21/08 (2)

RE: It is a full wave rectifier - rick_m 08:16:16 09/22/08 (1)

shunt regulators - Slider 08:36:34 09/22/08 (0)

Take an electronics class - Tweekeng 07:40:38 09/18/08 (0)

I'll gave you some quick info - Russ57 05:10:19 09/18/08 (6)

Is there merit in using both together, or does it "depend"? - Christopher Witmer 06:56:36 09/18/08 (5)

In general, you always would - Russ57 08:35:48 09/18/08 (4)

Speed of chokes versus caps - Christopher Witmer 15:45:57 09/18/08 (3)

"Speed" of chokes and caps - Al Sekela 10:18:49 09/19/08 (1)

We could write a book:) - Russ57 11:57:39 09/19/08 (0)

This is where you have to model - Russ57 07:12:13 09/19/08 (0)

Why not search.... - Uncle Mike 03:56:02 09/18/08 (0)

Follow Ups

This is where you have to model - Russ57 07:12:13 09/19/08 (0)

This is where you have to model

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