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M³ capacitor voltages

post #1 of 11
12/3/09 at 9:33pm
Thread Starter 
Hey guys, just joined the forum and wanted to say hi and ask a question also.
I am doing my first amp and PSU build and decided to go with a 24V σ11 and M³. I am very excited and have been working on ordering parts for the past week or so.
In AMB's parts list he says to use 50V electrolytics for the M³ and 63V electrolytics for the σ11. I am looking at using the Silmic II's for both and the most readily available parts are 35V. Will these work just fine with the PSU voltage at 24V? Also, will using a higher voltage capacitor just ensure the capacitor works for a longer period of time?
Thanks in advance
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post #2 of 11
12/3/09 at 9:49pm
If you're running the M3 off 24V, 35V caps should be fine - even 25V caps are fine. Just a note though - higher voltage caps usually have higher ripple rejection. Capacitor life span has no correlation to voltage rating.
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post #3 of 11
12/3/09 at 10:11pm
Thread Starter 
Thanks FallenAngel. Well, since I don't really need "boutique" caps in the power supply, maybe I should use a different cap with a higher voltage rating for that and still use the 35V Silmic II's in the amp.
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post #4 of 11
12/3/09 at 10:28pm
I'd use these from amb's parts list:

Panasonic FM (Digi-Key 100µF/50V: P12392-ND, 330µF/50V: P12399-ND)

These are all used for PSU filtering (C4, C5 and C7), and FMs are really good for that application; I'd take these over Silmics anyday.
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post #5 of 11
12/3/09 at 10:54pm
Thread Starter 
I had actually read a post or two about those Panasonic's and everyone seems very pleased with them. I'll check around for them, I noticed Mouser and Digikey both don't have the values I need (in stock).
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post #6 of 11
12/4/09 at 3:23am
Quote:
higher voltage caps usually have higher ripple rejection.
What the heck do you mean by "ripple rejection"?
Ripple current?
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post #7 of 11
12/4/09 at 3:25am
Mouser doesn,t carry the FMs. Digikey is showing a ship date of 12/10/2009 for the 100uf/50V P12392-ND that they are currently out of, so not a big deal. Digikey also carries Silmics BTW.
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post #8 of 11
12/4/09 at 4:08am
Quote:
Originally Posted by MisterX View Post
What the heck do you mean by "ripple rejection"?
Ripple current?
Yep - that would be it.
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post #9 of 11
12/4/09 at 4:51am
Thread Starter 
Lol, I had never heard of ripple rejection but I assumed you meant ripple current. So guys I have to ask what's the big deal with Muse and Rubicon Black Gate's and Silmic's in signal path applications.

Everywhere I turn I see people who swap out caps and find that these seem to sound better. I can understand that these are probably not suited for power supply use but in the signal path do they really make that much of a difference?

Now let me just say I have a 2-year degree in electronics, but this audio stuff is a whole new realm for me. I have a lot to learn, so I've just been reading as much as I can about all this.
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post #10 of 11
12/4/09 at 5:07am

P=I²R

Quote:
Originally Posted by FallenAngel View Post
Yep - that would be it.
In that case... it's not just the voltage rating.
the physical size of the capacitor also effects the the power dissipation.
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post #11 of 11
12/4/09 at 5:56am
Thread Starter 
Ok, I just went over the schematic again and understand there are no electrolytics in the signal path. I should just go with what amb lists as well as Pars recommended, the Panasonic FM's. Also ran across this recent thread. http://www.head-fi.org/forums/f6/amb...estion-456549/ Not sure if I will install the bass boost or not yet. Sorry guys I should've known to use the search more. The answers are right in front of my face. Thanks
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