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Old 26th August 2010, 03:23 AM   #1
GregH2 is offline GregH2  Australia
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Default PS Caps

Hi All,

Due to transformer options I have decided to go for a full dual mono power supply with my Aleph 3 project (two individual 300VA transformers). The aleph 3 requires about 100 000 uF per channel. I am going this route as I can use cheap off the shelf toroids this way.

As I am going for a dual rectifier design, and will therefore have a total of 4 bridge rectifiers, things are going to get complicated and messy if I use p2p wiring and big discreet capacitors.

I am contemplating making a power supply PCB with the rectifiers on the board, and using many 3900uF panasonic FC caps in parallel, also mounted on the PCB. I will have the PCB specially made using extra thick laminate and lots of mounting holes to try and reduce vibration and microphonics.

Can anyone see any problems or disadvantages with this approach over using big discreet capacitors, as per the norm?

Also, when using two toroidal transformers, is it ok to mount them on top of eachother using a single bolt down the middle and a rubber gasket in between?

Your advice is appreciated!

Greg.
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Old 26th August 2010, 06:55 AM   #2
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by swordfishy View Post
Hi All,



Can anyone see any problems or disadvantages with this approach over using big discreet capacitors, as per the norm?
nope .



Quote:
Originally Posted by swordfishy View Post
Hi All,

Also, when using two toroidal transformers, is it ok to mount them on top of eachother using a single bolt down the middle and a rubber gasket in between?

yes .
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Old 26th August 2010, 01:16 PM   #3
GregH2 is offline GregH2  Australia
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Thanks. After all this I found some cheapish 100k uF caps that I have decided to use so my initial post is now obsolete. They can be seen here:

Digi-Key - 495-4219-ND (Manufacturer - B41456B7100M)

Hope they're adequate!
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Old 26th August 2010, 02:15 PM   #4
GregH2 is offline GregH2  Australia
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Hmm,

I ordered the above 100 000uF caps thinking the ESR was quite low (4.1 milliohms), but now I see the ESL is perhaps quite high (20nH). Actually I don't know what is regarded as good... but I see they offer a 12nH low inductance version that may have been better...dammit!

This is one expensive learning curve...
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Old 26th August 2010, 02:28 PM   #5
Zen Mod is offline Zen Mod  Serbia
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EPCOS - use them and switch the brain off ;

besides that - when you're using insane amount of capacity - put 50uF motor run caps as bypass , and enjoy . so - one motor run for positive , one for negative PSU leg
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Old 26th August 2010, 02:33 PM   #6
GregH2 is offline GregH2  Australia
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Great thanks.

Everything is ordered. Looking forward to getting it together!

Interesting the use of motor run caps. Never heard of that before but I guess it's a neat way to get high capacitance film capacitors....interesting.

And yes, I do think too much and I also never sleep...
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Old 26th August 2010, 03:05 PM   #7
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by swordfishy View Post
......

Interesting the use of motor run caps. Never heard of that before but I guess it's a neat way to get high capacitance film capacitors....interesting.

.....
that's old story

cheap and pretty much best solution to have pro quality film caps .

not just a few audiophool caps are rebranded and sometimes re-cased industrial caps
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