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Are dual rectifier bridges useful?
Are dual rectifier bridges useful?
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Old 22nd February 2004, 03:10 PM   #21
runebivrin is offline runebivrin  Sweden
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Wow, there's certainly a wealth of information to be found if you're willing to shut up and listen.

I looked into the thread pointed out to me by UrSv (yes, I should've found it myself...), and I must say Fred made a very clear case for how dual bridges can help reduce grounding issues, once I digested the details. From what I understand, this also means a high ESR will contribute a substantial saw tooth ripple as the charge currents get larger under load, which should then cause a greater content of harmonics on the supply voltage, which is more likely to propagate to other parts of the circuit.

On the other hand, low ESR would let the pulse current be greater, which would also cause greater ripple, and also make inductive coupling from the non DC parts of the PSU to the amplifier circuit more of a problem.

Ah well, it sure is an interesting can of worms, once you start getting below the surface...

One of the problems with being an amateur is not having access to particularly exciting measurment tools, so I guess I'll have to take Johns word for the garbage being spewed out by regular slow diode bridges and single bridges. Whether I'm able to hear the difference is another issue alltogether.

Do wizards use spell checkers?
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Old 22nd February 2004, 03:56 PM   #22
Peter Daniel is offline Peter Daniel  Canada
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I believe Fred's thread on diodes was somewhat influenced by my "experimentation" with the sound of different diodes at that time

Not only high speed diodes sound different than regular bridges, but they also sound different from one another, depending on type, rating and even manufacturer.

After many tries, I finally settled on MUR860 in my amp. I was suggested that MSR860 might have been even a better choice, but after extensive listening I found it too bright.

Yet, in my DAC, it's MSR860 that sounds better and actually less bright than MUR860. As always experimentation and listening test are recommended.
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Old 22nd February 2004, 11:30 PM   #23
john curl is online now john curl  United States
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Peter and Fred, I tend to agree with both of you. Looking at your previous inputs, I am impressed! Fred, your explanation of why we use dual bridges is excellent. I am, of course, not the first to tell you this. Peter, your diode comparison is very similar to what we have found.
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Old 23rd February 2004, 09:15 AM   #24
Fred Dieckmann is offline Fred Dieckmann  United States
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Wink Live and let diode

"I am, of course, not the first to tell you this."

But maybe the last I expected to. I will have to keep on my toes if people with the experience you have are going to read my post.
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Old 23rd February 2004, 10:33 AM   #25
millwood is offline millwood  United States
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I tried a few soft recovery diodes vs. conventional bridges and I couldnt' hear any differrence.

I am not sure if the whole thing is a fad or what.
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Old 23rd February 2004, 11:56 PM   #26
Jocko Homo is offline Jocko Homo  United States
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Why am I not surprised................

BTW, John.............the prices on the really good diodes has dropped over the last few years as they become more popular. Seems that we are not the only ones who now use twice as many as needed.

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