schotty vs bridge rectifier

Leolabs · 19th August 2006, 01:43 AM

For Gainclone application,is there really an audible difference between them???

billdinva · 19th August 2006, 02:25 AM

It depends on the amount of snake oil you rub on them

Nuuk · 19th August 2006, 08:07 AM

It doesn't cost much to find out!

owen · 19th August 2006, 08:48 AM

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

Owen

DoomPixie · 19th August 2006, 05:50 PM

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

consort_ee_um · 19th August 2006, 09:26 PM

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!

cpemma · 20th August 2006, 02:15 PM

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.

owen · 20th August 2006, 03:05 PM

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

19th August 2006, 01:43 AM	#1
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	schotty vs bridge rectifier For Gainclone application,is there really an audible difference between them???

19th August 2006, 08:07 AM	#3
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	It doesn't cost much to find out! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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19th August 2006, 02:25 AM	#2
billdinva diyAudio Member Join Date: Mar 2006 Location: Virginia	It depends on the amount of snake oil you rub on them

19th August 2006, 08:48 AM	#4
owen diyAudio Member Join Date: Mar 2004 Location: Shilton	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 Owen

19th August 2006, 05:50 PM	#5
DoomPixie diyAudio Member Join Date: Jun 2005 Location: Aberystwyth / Llanelli (wales)	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

19th August 2006, 09:26 PM	#6
consort_ee_um diyAudio Member Join Date: May 2004 Location: Hertfordshire	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!

20th August 2006, 02:15 PM	#7
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	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.

20th August 2006, 03:05 PM	#8
owen diyAudio Member Join Date: Mar 2004 Location: Shilton	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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