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Old 7th November 2005, 06:24 AM   #1
HugoR is offline HugoR  Canada
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Default 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
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Old 7th November 2005, 11:07 AM   #2
HugoR is offline HugoR  Canada
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Trying to post PS circuit here. Sorry.
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File Type: jpg amp ps.sch.jpg (89.5 KB, 377 views)
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Old 7th November 2005, 08:42 PM   #3
amperex is offline amperex  United States
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Replace with silicon diodes.
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Old 7th November 2005, 10:54 PM   #4
HugoR is offline HugoR  Canada
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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
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Old 7th November 2005, 11:58 PM   #5
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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.
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Old 8th November 2005, 02:04 AM   #6
HugoR is offline HugoR  Canada
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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
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Old 8th November 2005, 02:20 AM   #7
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hello

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

berry
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Old 8th November 2005, 02:46 AM   #8
HugoR is offline HugoR  Canada
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Hi Berry,

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

Hugo
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Old 8th November 2005, 10:45 PM   #9
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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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Old 9th November 2005, 08:34 AM   #10
EC8010 is offline EC8010  United Kingdom
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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.
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