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Old 19th August 2006, 02:43 AM   #1
Leolabs is offline Leolabs  Malaysia
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Question schotty vs bridge rectifier

For Gainclone application,is there really an audible difference between them???
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Old 19th August 2006, 03:25 AM   #2
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It depends on the amount of snake oil you rub on them
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Old 19th August 2006, 09:07 AM   #3
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Old 19th August 2006, 09:48 AM   #4
owen is offline owen  United Kingdom
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its also a question that is applicable to chip amps vs discrete..

The schottky diodes are discrete, and have a very nice cut off characteristic, whereas the bridge's that are available tend to be encapsulated single wafer 'ordinary' diodes.

However, and heres the rub - single wafer items are usually much, much better matched interms of the charecteristics in comparison to thier discrete counterparts - so in the gainclone, the psu behaves in a more uniform way with a bridge, compared to a discrete bridge made of schottkys. The downside is that most cheapo bridges have quite nasty sharp cut-off characteristics, and unless properly managed (in the power supply), can inject large amounts of RF into the circuitry bevause of it.

This is often audible in a simple PSU, however it is so easily blocked using a high amperage choke (it only needs to be a few mH, and ferrite cores are ok in this instance) after the caps, on in each rail, and one in the ground connection, and then comparisons become in the main academic between the two types...


Just my thoughts


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Old 19th August 2006, 06:50 PM   #5
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i just thought i'd say... stop stealing my name! im the only owen in this village...
just kidding..
i always wondered about what diod's to use for a rectifier.. but never really paid too much atention to it and always just used what i had lying around that was up to the job..
Owen
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Old 19th August 2006, 10:26 PM   #6
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Its the surge current rating which is important, Schotty's tend to have a lower surge rating for a given nominal current. Its not just the switch on surge, the diodes only conduct for a short period of the sine wave see:
http://www.siteswithstyle.com/VoltSe...and_xfmrs.html
which show it aint so simple!
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Old 20th August 2006, 03:15 PM   #7
cpemma is offline cpemma  United Kingdom
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If I can butt in without going too far OT, with silicon diodes/bridges, is "glass-passivated" of any concern when buying? My google skills fail on pros & cons re audio.
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Old 20th August 2006, 04:05 PM   #8
owen is offline owen  United Kingdom
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DP,

I've been in this village for years, and other villages for longer - its just taken a while for another to join with the same name...


Owen
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