PSU Design help !!!

costa23 · 18th September 2008, 01:15 AM

does anyone know about this psu design name ?
how about this design ? i wanna use this to drive my 5687 pararel single ended line stage.
please advice...
thanks a lot

Eli Duttman · 18th September 2008, 01:31 AM

That's a hybrid bridge rectifier. The "sand" diodes form the path to ground. Use UF4007s in parallel with 10 nF. high WVDC snubber caps., to keep SS diode switching noise out of the power trafo.

costa23 · 18th September 2008, 02:16 AM

What the quality if compare to pure tube rectifier ?
thanks

costa23 · 18th September 2008, 02:23 AM

Eli, do you mean the 10nF is parareled to ss rectifier ?
thanks

volavola · 19th September 2008, 06:52 PM

Hi Costa
5687 merit something better. Why you want to use that circuit?
I think just tube it's better but 470uF after 6X4 it's wrong. I'm not sure but I remember 8uf it's the limit for 6X4 rectifier. Anyway you can use a capacitance multiplier with great satisfaction.
Good work

Tom Bavis · 19th September 2008, 07:16 PM

The limitation is peak current - if there's enough series resistance, 4700 uF would be OK... PSU Designer (program form duncanamps.com) can tell you what the peak current is...

costa23 · 20th September 2008, 01:22 AM

oopss sorry ...
there is 47 uF not 470 uF.
Do you mean the pure tube rectifier is sound better ?

Tweeker · 20th September 2008, 05:37 AM

The 10nF is connected one capacitor across each silicon diode.

ray_moth · 20th September 2008, 06:17 AM

Quote:

Do you mean the pure tube rectifier is sound better ?

No, pure tube will not sound any better IMHO. Using a tube rectifier for half of the bridge effectively suppresses noise from the other half (the SS half). It's a good solution, and the best tube diodes to use are TV damper diodes.

Merlinb · 20th September 2008, 03:42 PM

Quote:

Originally posted by costa23
What the quality if compare to pure tube rectifier ?
thanks

It will sound the same as a pure tube rectifier.

18th September 2008, 01:31 AM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	That's a hybrid bridge rectifier. The "sand" diodes form the path to ground. Use UF4007s in parallel with 10 nF. high WVDC snubber caps., to keep SS diode switching noise out of the power trafo. __________________ Eli D.

20th September 2008, 05:37 AM	#8
Tweeker diyAudio Member Join Date: Dec 2004 Location: Cincinnati, Ohio	The 10nF is connected one capacitor across each silicon diode. __________________ Be sure your foil hat has a good low impedance ground.

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18th September 2008, 02:16 AM	#3
costa23 diyAudio Member Join Date: Aug 2008	What the quality if compare to pure tube rectifier ? thanks

18th September 2008, 02:23 AM	#4
costa23 diyAudio Member Join Date: Aug 2008	Eli, do you mean the 10nF is parareled to ss rectifier ? thanks

19th September 2008, 06:52 PM	#5
volavola diyAudio Member Join Date: Feb 2005 Location: Florence	Hi Costa 5687 merit something better. Why you want to use that circuit? I think just tube it's better but 470uF after 6X4 it's wrong. I'm not sure but I remember 8uf it's the limit for 6X4 rectifier. Anyway you can use a capacitance multiplier with great satisfaction. Good work

19th September 2008, 07:16 PM	#6
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	The limitation is peak current - if there's enough series resistance, 4700 uF would be OK... PSU Designer (program form duncanamps.com) can tell you what the peak current is...

20th September 2008, 01:22 AM	#7
costa23 diyAudio Member Join Date: Aug 2008	oopss sorry ... there is 47 uF not 470 uF. Do you mean the pure tube rectifier is sound better ?

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