| mateo88 |
| Just wondering, with a regulated power supply, does the type of bridge rectifier or diodes used make a difference? I know MUR860's are good, as well as others, but with a regulated power supply would there be any difference between say an MUR860 and a cheapo bridge rectifier from Radio Shack or something? |
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| cdoggy81 |
Good question as I was wondering the same thing. How does a MUR860 compare to a RURP860. What about in bridged apps where more amps are needed? Would one of those work or would something like this be better?
http://www.partsexpress.com/images/050-060m.jpg
400V 25A BRIDGE RECTIFIER |
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| alexw88 |
| I also found that 35A 1000V bridge is also quite cheap. It may be slower than the MUR860 but with the use of regulator do we really need a fast rectifier? |
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| Peter Daniel |
| quote: | Originally posted by mateo88
Just wondering, with a regulated power supply, does the type of bridge rectifier or diodes used make a difference? I know MUR860's are good, as well as others, but with a regulated power supply would there be any difference between say an MUR860 and a cheapo bridge rectifier from Radio Shack or something? |
Yes, it does make a difference. I also don't like caps across MUR diodes. I did some testing yesterday, and it confirms it. |
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| sam9 |
Somewhere there is an app note that touches on rectifier noise that argues that "fast" vs "slow" inot that important if goal is just to get very quiet DC from mains AC. Instead the "softness" of the recovery is the important factor. Parts of the app note seem to be consistent the Hagerman article on snubbers. But anyway, faster and ultra-fast recifiers surveyed tended not to qualify as soft recovery, while in the "soft recovery" group the 1N400x group were just as "soft" as the more exotic and expensive types.
I think thos was a Fairchild or a Diodes,Inc app note.
I would imageine that standard bridge rectifiers behave pretter similarly to the standard single 1N400x types. Anyway, if you can calculate the optimum snubbers from the Hagerman article (www.hagtech.com), you chould be abble to air wire them to the corners of a typical bridge rectifier and good beginning to a very quiet regulated supply.
PS: Some folks think it is more fun and satifying to get good performance from thoughtful use or ordinary components than by "buying your solution". Some like the exotic components for the coolness factor. |
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| Sherman |
| quote: | Originally posted by mateo88
Just wondering, with a regulated power supply, does the type of bridge rectifier or diodes used make a difference?... |
I'm not able to answer your question from training or vast experience but it seems that one could use any diodes of the proper values by simply taking the output of the bridge through a
single soft/fast recovery diode. (My experience doing this includes only 2 projects, so take this with a grain of salt.)
I tried it on a tube amp because of this site- http://www.siteswithstyle.com/VoltS...Push_Pull.html, scroll about 3/4 of the way down to the section titled "Adding an Ultra Fast Diode in Series With the Diode Bridge".
I also tried it on a GC with unregulated supply, using the PE bridge. The only effect I noticed was less "hum" when no source was playing and the volume was turned very high. (To be honest, even without the diode hum is inaudible unless very close to the speakers with the volume set pretty high, but it was definitely lower with a single fast/soft diode after the bridge.) |
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| falcott |
Hi Sherman, the link doesn't seem to work for me... Is it correct :confused:
edit: ahh, I've got it. Just delete the comma at the end, and it works :) |
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| mateo88 |
Peter, might I inquire as to what difference there is? I haven't tested it yet, I was just wondering.
That's an interesting idea, Sherman. I might have to give that a shot. |
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