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Old 16th March 2007, 05:00 AM   #1
yusuf is offline yusuf  India
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Question Why MUR860? Why not bridge module?

I see most of the power supply design for gailcone (3886, 4780) are uses discrete diodes (e.g. MUR860 or similar). Any specific reason? Why not bridge modules which are available for any current rating and also have less forward drop compared to discrete diodes bridge. Also, PCB would be simpler.

I am sure there must be good reason to use descrete diodes. Can anyone clarifies.
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Old 16th March 2007, 05:18 AM   #2
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MUR860's were identified by Peter Daniel as sounding better than others he had test driven. Bridges are usually frowned upon because you have a smaller selection, and are tougher to get in fast- and ultrafast-fast recovery flavours, which impart less switching noise.

That being said, don't be afraid to shop around, there's so much out there. I just bough a bunch of 15A, isolated, ultrafasts for $1/each at Digikey, exactly what I need for my next project!
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Old 16th March 2007, 05:42 AM   #3
yusuf is offline yusuf  India
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Thanks for reply. I keep on hearing "it sounds better" but why? How does diode will effect the sound?

Switching noise? Is it noticeable?
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Old 16th March 2007, 06:27 AM   #4
luka is offline luka  Slovenia
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Hi

How can it have less switching noise if there is only 50Hz present, unless you will use SMPS, but even in that case, if designed good you can say it will have zero switching noise.
So I don't see why would Mur's or any fast diodes be better than bridge modules.

And please don't say you can "hear" the difference
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Old 16th March 2007, 06:45 AM   #5
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Quote:
Originally posted by luka
if designed good you can say it will have zero switching noise.
That's a nonsensical statement. Zero noise is a theoretical construct. All circuits have noise.
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Old 16th March 2007, 07:13 AM   #6
yusuf is offline yusuf  India
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Quote:
Originally posted by leadbelly


That's a nonsensical statement. Zero noise is a theoretical construct. All circuits have noise.
I guess he is refering to relative switching noise.

Question remains, does MUR860 really have impact on sound?
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Old 16th March 2007, 07:22 AM   #7
phn is offline phn  Sweden
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I go with bridges any time. It's less manly. But at least I don't have to bother about matching diodes. Of course, matching diodes is even manlier. What's more manly than taking something simple and make it unnecessarily complicated?
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Old 16th March 2007, 07:33 AM   #8
yusuf is offline yusuf  India
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Did some more search, a nice writeup by Bob Pease on similar topic:

http://www.elecdesign.com/Articles/I...rticleID=13166

I also plan to go with bridge but thought I would ask.
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Old 16th March 2007, 08:03 AM   #9
Eva is offline Eva  Spain
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Default Re: Why MUR860? Why not bridge module?

Quote:
Originally posted by yusuf
I see most of the power supply design for gailcone (3886, 4780) are uses discrete diodes (e.g. MUR860 or similar). Any specific reason?
Fashion. Exoticness. Conventional diode bridges are too old and straight...
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Old 16th March 2007, 01:10 PM   #10
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Because TO-220 is secksy and DF, KBB, KBP, GBU, GBL, KBPC, KAB, GBPC, and MB are all ugly fat has-beens!!!
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