Why MUR860? Why not bridge module?

yusuf · 16th March 2007, 05:00 AM

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.

leadbelly · 16th March 2007, 05:18 AM

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!

yusuf · 16th March 2007, 05:42 AM

Thanks for reply. I keep on hearing "it sounds better" but why? How does diode will effect the sound?

Switching noise? Is it noticeable?

luka · 16th March 2007, 06:27 AM

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

leadbelly · 16th March 2007, 06:45 AM

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.

yusuf · 16th March 2007, 07:13 AM

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?

phn · 16th March 2007, 07:22 AM

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?

yusuf · 16th March 2007, 07:33 AM

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.

Eva · 16th March 2007, 08:03 AM

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...

theAnonymous1 · 16th March 2007, 01:10 PM

Because TO-220 is secksy and DF, KBB, KBP, GBU, GBL, KBPC, KAB, GBPC, and MB are all ugly fat has-beens!!!

16th March 2007, 05:00 AM	#1
yusuf diyAudio Member Join Date: Jan 2007	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.

16th March 2007, 05:18 AM	#2
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	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! __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

16th March 2007, 06:27 AM	#4
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	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 __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA

16th March 2007, 01:10 PM	#10
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	Because TO-220 is secksy and DF, KBB, KBP, GBU, GBL, KBPC, KAB, GBPC, and MB are all ugly fat has-beens!!! __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

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16th March 2007, 05:42 AM	#3
yusuf diyAudio Member Join Date: Jan 2007	Thanks for reply. I keep on hearing "it sounds better" but why? How does diode will effect the sound? Switching noise? Is it noticeable?

16th March 2007, 07:22 AM	#7
phn diyAudio Member Join Date: Oct 2004	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?

16th March 2007, 07:33 AM	#8
yusuf diyAudio Member Join Date: Jan 2007	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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