Power supply question

HugoR · 7th November 2005, 06:24 AM

Hi,

I am building this PS

[IMG]C:\amp ps.sch.jpg[/IMG]

Circuit shows 25ma 600v selenium rectifiers (SR1, SR2). I was wondering if I should simply use a silicon diode or bridge rectifier in place of SRs.

A fullwave rectifier is taking advantage of both sides of the sine wave? Does it will make a difference here?

Also, don't know if I should go with fast recovery diodes, Standard Recovery, or Glass Passivated, or etc.

Thanks for the help folks. I surely appreciate it!
HugoR

HugoR · 7th November 2005, 11:07 AM

Trying to post PS circuit here. Sorry.

amperex · 7th November 2005, 08:42 PM

Replace with silicon diodes.

HugoR · 7th November 2005, 10:54 PM

My intent was to use silicon diodes. But seeking for more info about using simple diode vs bridge rectifier. Also seeking for info about diodes type: fast recovery, std recovery, Glass Passivated and Schottky... What type to use in audio.

Thanks for any and all help.
Hugo

Eli Duttman · 7th November 2005, 11:58 PM

If the cost does not put you off, use Schottkys. The reason is simple, ZERO switching noise. Even the very best PN junction diodes, say FREDs, produce some switching noise.

HugoR · 8th November 2005, 02:04 AM

Hi Eli,

2 Infineon Schottkys rated 600V, 4A cost 5.28 $CAN at Digikey. I can afford that. But does it really worth it?

FRED is about 2 $CAN.

Thanks folks.
All the best,
Hugo

opamps suck · 8th November 2005, 02:20 AM

hello

just curious about that PSU. would you mind telling me the values of R53 & R54 and C25 & C26? thank you

berry

HugoR · 8th November 2005, 02:46 AM

Hi Berry,

R53 = R54 = 27000 ohm, 1W
and
C25 = C26 = .05 uF/600V

Hugo

zarniwoop · 8th November 2005, 10:45 PM

sr1/2 are bias supply half-wave rectifier diodes, right? You don't need 600V for those, but schottky type is okay. I'd ditch the dual gz34 for schottky diodes too, but then you will need 1200V type... Well unless you must use tube rectification. correct me if I am wrong anyone.

EC8010 · 9th November 2005, 08:34 AM

You can almost certainly get away with 600V Schottky in place of those horrible selenium things, but I'd be distinctly nervous about replacing the GZ34 even with 1200V Schottky. I still remember the bright light that came from a bridge rectifier using 600V Schottky attempting to deliver 400V HT. The circuit had been carefully simulated in PSUD and although it was close to the limits, it was below all of them even at simulated switch-on. Clearly, reality was a little different. I went back to using ordinary (robust) diodes.

7th November 2005, 06:24 AM	#1
HugoR diyAudio Member Join Date: Oct 2005	Power supply question Hi, I am building this PS [IMG]C:\amp ps.sch.jpg[/IMG] Circuit shows 25ma 600v selenium rectifiers (SR1, SR2). I was wondering if I should simply use a silicon diode or bridge rectifier in place of SRs. A fullwave rectifier is taking advantage of both sides of the sine wave? Does it will make a difference here? Also, don't know if I should go with fast recovery diodes, Standard Recovery, or Glass Passivated, or etc. Thanks for the help folks. I surely appreciate it! HugoR

7th November 2005, 11:58 PM	#5
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	If the cost does not put you off, use Schottkys. The reason is simple, ZERO switching noise. Even the very best PN junction diodes, say FREDs, produce some switching noise. __________________ Eli D.

9th November 2005, 08:34 AM	#10
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	You can almost certainly get away with 600V Schottky in place of those horrible selenium things, but I'd be distinctly nervous about replacing the GZ34 even with 1200V Schottky. I still remember the bright light that came from a bridge rectifier using 600V Schottky attempting to deliver 400V HT. The circuit had been carefully simulated in PSUD and although it was close to the limits, it was below all of them even at simulated switch-on. Clearly, reality was a little different. I went back to using ordinary (robust) diodes. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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7th November 2005, 08:42 PM	#3
amperex diyAudio Member Join Date: Feb 2005 Location: MI	Replace with silicon diodes.

7th November 2005, 10:54 PM	#4
HugoR diyAudio Member Join Date: Oct 2005	My intent was to use silicon diodes. But seeking for more info about using simple diode vs bridge rectifier. Also seeking for info about diodes type: fast recovery, std recovery, Glass Passivated and Schottky... What type to use in audio. Thanks for any and all help. Hugo

8th November 2005, 02:04 AM	#6
HugoR diyAudio Member Join Date: Oct 2005	Hi Eli, 2 Infineon Schottkys rated 600V, 4A cost 5.28 $CAN at Digikey. I can afford that. But does it really worth it? FRED is about 2 $CAN. Thanks folks. All the best, Hugo

8th November 2005, 02:20 AM	#7
opamps suck diyAudio Member Join Date: Nov 2005	hello just curious about that PSU. would you mind telling me the values of R53 & R54 and C25 & C26? thank you berry

8th November 2005, 02:46 AM	#8
HugoR diyAudio Member Join Date: Oct 2005	Hi Berry, R53 = R54 = 27000 ohm, 1W and C25 = C26 = .05 uF/600V Hugo

8th November 2005, 10:45 PM	#9
zarniwoop diyAudio Member Join Date: Nov 2003 Location: NY	sr1/2 are bias supply half-wave rectifier diodes, right? You don't need 600V for those, but schottky type is okay. I'd ditch the dual gz34 for schottky diodes too, but then you will need 1200V type... Well unless you must use tube rectification. correct me if I am wrong anyone.

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