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Old 4th January 2013, 04:00 PM   #91
6L6 is offline 6L6  United States
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When connecting the bridges to the cap board, the acid test is to make sure that the bridge negative connects to the capacitor negative.
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Old 4th January 2013, 04:02 PM   #92
6L6 is offline 6L6  United States
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Quote:
Originally Posted by oneplustwo View Post
Now... to decide which rectifiers to get... I'm inclined to just the cheap 35A fairchild ones. Open to suggestions.
Just get the Vishay bridges with slow diodes in them. Nelson prefers them for high-current supplies. I will link to the article where he talks about it.
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Old 4th January 2013, 04:05 PM   #93
6L6 is offline 6L6  United States
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Ok, here it is - read the heading under "rectifiers".

http://www.passdiy.com/pdf/powersupply.pdf

If you want to use a snubber capacitor (the caps he mentions in the last sentence) place a .22uf film cap across the AC side of the bridge. At least a 63v volt cap. Easy!
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Old 4th January 2013, 04:58 PM   #94
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Awesome... four rectifiers and four snubber capacitors are in my future.

Perhaps these. Hopefully I can find some .22uF film caps in my parts bin.
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Old 4th January 2013, 05:04 PM   #95
6L6 is offline 6L6  United States
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There is no real need for the 1000v rating. Use the 200v... Nelson does.

If your box is bare, something like this seems good - ECQ-V1J224JM Panasonic Electronic Components | Mouser
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Old 4th January 2013, 05:12 PM   #96
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They were only pennies more expensive so I thought why not. Is there a downside other than the extra few nickels I'll spend?
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Old 4th January 2013, 05:25 PM   #97
6L6 is offline 6L6  United States
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That has always been a question of mine as well... There has to be something, if there wasn't why wouldn't all diodes be 1000v??

I honestly don't know. I'm sure there is a discussion about it somewhere... I will ask my Guru when I get a chance also.
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Old 4th January 2013, 05:41 PM   #98
toufu is offline toufu  United States
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Hi Oneplustwo, I am thinking of building an 100watt Aleph X also. Can you post the BOM you are using? Thanks.
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Old 5th January 2013, 06:48 AM   #99
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@toufu - PM sent. Good to see a fellow San Franciscan on diyaudio!

@6L6 - Let me know if you find anything out. I'll probably just go ahead and order the 200V ones. Go with the devil you know and all.

Unless someone has 4 they have lying around they'd like to part with. Pet peeve paying more for shipping than the parts are worth! Too bad there's not amazon Prime for bridge rectifiers.
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Old 6th January 2013, 12:12 AM   #100
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6L6 - For the snubber caps, is .22uF critical? I have some that wima 1uF 100V caps and a few that are .1uF as well in the parts bin. I'll just order new ones if I need to... they're not that much anyway. Just feels good to use spare parts! =)

Also, could I use different ones for different rectifiers? Seems like a somewhat less than critical part where I can get away with that.
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