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It's not the caps in the Juli@ + First impressions on: Ferrites & decoupling caps

Hi Theo,

* caps on the Juli@ digital part
Today I removed the bulky Audyn elco bipolar speaker crossover caps and replaced them with two Oscon 330 uF caps that arrived yesterday (along with the flat ferrites for ribbon cables).

I still can warm boot into 100 and cold boot into 110 – 115 (I don’t know why this isn’t always the same value). So the Audyn caps on the digital part play no role in it.

These Oscon caps again brought a clear noticeable improvement in SQ. Hearing what SQ improvement is achieved only trough changing caps, I think i’m going too closely study how I can power the digital part by battery like you do. I expect some significant SQ improvement.

* About the ferrites on the P24: use them with decoupling caps.
I feel I have a clear picture now on how ferrites on the P24 best can be used. It is just as one can read in several articles: ferrites are best used together with decoupling caps.
So I placed caps on the 3.3 , 5 and 12 volt lines (between the Antec PSU and the ferrites).
This results in a very significant SQ improvement!
Without the caps in place, ferrites on the P24 give a nice little subtle improvement.
But with the caps added it’s a bigger improvement than adding a SSD. So not small!

What is even more astonishing, I do these experiments with the Antec ATX. Because the Pico can’t handle big caps (4700 uF + 47uF + 0,47 uF) on the P24 because pico’s can’t deliver the big rush in currents too the 4700 cap when switched on.

* After 4 weeks of tweaking with ferrites the preliminary conclusion is:
With a lot of ferrites + decoupling caps on the Antec ATX the SQ is very good.
I don’t feel any need too swap the Pico back in place.
The Antex + (a lot of) ferrites + decoupling caps sounds very good too me.

Mark

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