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Old 26th October 2012, 06:35 AM   #11
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No, it allows for 4 x 35mm or 8 x 20mm. Unless you place 4 on the top and 4 on the bottom. Will make fitting the PCB a challenge, maybe very long stand-offs could work.
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Old 27th October 2012, 12:22 PM   #12
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8 x 30mm size caps will fit.
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Old 27th October 2012, 04:15 PM   #13
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Default Caps?

Could folks give a list of the brand and part # of PSU caps they are using and why they choose them?

I am not familiar with the "speed" rating of caps, just voltage, farads, and ESR.

Looking at some Panasonic Electrolitics because of the value, but wonder if spending 5x on something more esoteric will change the sound drastically.

Mouser gives 4 different part numbers for the same cap, and the prices change a bit, but the data sheet does not show what the differences are.

Thanks.
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Old 27th October 2012, 10:42 PM   #14
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Default More capacitor questions ?

Will the pcb handle using 4 x 33000uf caps as opposed to 8 x 15000uf ? The F4 manual shows a 120,000uf of total capacitance. If so what changes such as resistor values... need to be done ? The transformer I have is a 400VA - 2 x 18v secondary ! Any help would be greatly appreciated. Again thank-you everyone !
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Old 28th October 2012, 08:01 AM   #15
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Mark floats the idea of stacking boards on top of each other in this post. With a bit of creativity, you could stack multiple boards on top of each other using standoffs.
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Old 29th October 2012, 02:30 AM   #16
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Is ok to mount capacitors up-side down ? After looking over the psu board I had thought to possibly use 12 x 10,000uf caps. Mount 8 on top than 4 up-side down on the bottom in the larger cap slots.... This gives me the 120.000uf needed and the additional cost and labor would be less needing 4 more caps and a set of stand-offs.
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Old 29th October 2012, 02:39 AM   #17
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I don't see any reason why it shouldn't work. I have not read any literature stating it's bad to mound caps upside down, unless someone can point me to one as I have less and less time to read nowadays.

Just be mindful of the pin orientation/polarity when installing those capacitors.
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Old 29th October 2012, 02:55 AM   #18
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That is sounds like good news ! What do you and/or anyone else think of these caps ? LKG1V103MESBBK Nichicon | Mouser

Last edited by thor61; 29th October 2012 at 03:15 AM.
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Old 29th October 2012, 03:17 AM   #19
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Those caps looks great. I have used 25V caps with 18V secondary toroidal transformer (as recommended by Nelson Pass in his manuals) without any problems since the power supply is supplying a Class A amp that draws current constantly. That way, you may try to look for 25V 15,000uf caps with a diameter of 30mm and LS of 10mm.

If you plan on doing the "top and bottom" installation, you can use 30mm sized caps on top and then 35mm caps at the bottom side. Just an idea I thought you may like.

don't be afraid to go a little bit over the specified 120,000uf...

"It's better to have more capacitance and not need it, than need capacitance and not have it..."
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Old 29th October 2012, 03:35 AM   #20
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The reason for wanting to use the above posted Nichicons is I have a dozen of them from another unfinished project. The PASS manual says to use 25v, what is the worst thing that could happen if using 35v ? I have looked at a lot of other caps but the problem is either there not stocked or many have to great of a min order.
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