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diyAudio Power Supply Circuit Board v3 illustrated build guide
diyAudio Power Supply Circuit Board v3 illustrated build guide
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Old 30th January 2018, 03:10 AM   #621
ticknpop is offline ticknpop  Canada
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Snubbers done correctly are useful for Class A amps too.
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Old 30th January 2018, 03:24 AM   #622
6L6 is offline 6L6  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
1) No, that would actually make the filtering worse.
2) Leave empty. You won't need them. (well, maybe perhaps possibly if you have a horrible and nasty transformer, the input snubber, but the output snubber? Nope)
3) Where are you going to order parts from? I'll happily look and give a specific recommendation.

That said, the most important criteria are that they fit...

Electrolytic capacitor
snap-in
10mm lead spacing 2-pin (normal on 10mm, but make sure)
Max. 35mm diameter
No real limit to height
At least 15,000uF
At least 25V rated

More voltage rating will give longer life.
Also, generally speaking, a bigger can for a given capacitance will have more ripple rating, and, more life due to running it at a lower than maximum load.
105C rated caps will also give longer life since you'll be running them under that rating.

If I was to order tonight from Mouser, I'd get these -

SLP223M035H9P3 Cornell Dubilier - CDE | Mouser

Last edited by 6L6; 30th January 2018 at 03:30 AM.
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Old 30th January 2018, 08:54 AM   #623
mrdave45 is offline mrdave45  United Kingdom
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IIRC the ripple current rating is very important. Unfortunately I cant find the post, maybe someone knows off the top of their head what the minimum requirement is.
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Old 30th January 2018, 09:05 AM   #624
Roo2 is offline Roo2  Australia
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Thanks 6L6. Much appreciated. I can order through either Mouser or Digikey with the latter being slightly easier (only because the BOM has DK product codes) but I'm happy to go with either.
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Old 30th January 2018, 09:34 AM   #625
JeffYoung is offline JeffYoung  Ireland
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diyAudio Power Supply Circuit Board v3 illustrated build guide
Google PSUD2, download it, and play around with it. It's got a terrible user-interface, but is still wonderfully useful.

It will tell you, among other things, the voltage across your capacitors, the ripple current they're getting hit with, and the residual ripple your amplifier will see.

You can then experiment with different R values and different C values.

If you get stuck trying to figure it out, just post here. A lot of us use it.

Cheers,
Jeff.
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Old 30th January 2018, 04:51 PM   #626
AndrewT is offline AndrewT  Scotland
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It is worth reading all the old articles that N.Pass has published.
They give lots of very useful background, much of which will help you to decide where normal parts can be fitted and where selected/special parts are needed. And how to select them.
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Old 30th January 2018, 08:36 PM   #627
fabrice63 is offline fabrice63  France
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you took the words out of my mouth

Mr Pass has said it all already ......


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Last edited by fabrice63; 30th January 2018 at 08:39 PM.
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Old 7th February 2018, 04:54 PM   #628
vlv81 is offline vlv81  New Zealand
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Hi all, just wondering if Cornell Dubilier capacitors are o.k.to use in the power supply build. Digikey part number 338-1579-ND or 338-1614-ND. Was hoping to use some Nichicon, but the snap in of suitable size don't appear to be available for some time, same with the Panasonic that seem to be used in a lot of builds. Some are no longer available. Digikey cross reference some Rubycons or the Cornell Dubilier. The main reason for asking after 6L6 mouser link on 30th Jan is the ones I linked are available locally. I must have missed them off my parts order from Mouser when ordering parts for amp and supply. Thanks and apologies for newbie question.

Last edited by vlv81; 7th February 2018 at 05:22 PM.
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Old 21st February 2018, 10:39 AM   #629
Roo2 is offline Roo2  Australia
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Hello again. All my parts have been delivered. I bought R1 to R8 per the BOM. Do I install them all? I think I saw a photo somewhere here recently with less installed.. It's going to be a supply for an Aleph J.
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Old 21st February 2018, 12:13 PM   #630
6L6 is offline 6L6  United States
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diyAudio Power Supply Circuit Board v3 illustrated build guide
vlv81 - Use whatever caps you can get that are the proper size, value and voltage rating. There's honestly not much difference between capacitors.

Roo2 - Use (4) 0.47ohm 3W resistors per rail. Leave the snubbers empty. Make the bleeder anything between 2.2K and 10K 3W, and the LED resistors 10K or so.
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