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for filtering only: you don't need the 4700 bulk cap.

Hi Jolida,

Yes. If you want too filter the output too the Juli@ and/or the P4 than filter has too be between the PSU and the Juli@ / P4.

Following the Muratta Paper on the use of ferrites or the Altera AN 583 paper, I just copied the values they where using in their experiments.
The values I copied from these papers too create a pi filter are: 470 uF before and 47uF behind
If these are appropriate values for what I’m trying too do, I don’t know. I just copied.
Never the less, the effects on SQ in my setup are remarkable.

=>P4
* 12v linear psu => 470uF => 2 ferrites with each 3 or 4 turns (!) => 47uF => P4

=> P24
* Pico => P24 extension cable => 470 uF => 7 flat bead ferrites for flat ribon cable => 47 uF => P24
Too avoid a DC bias, all P24 wire must go through the ferrite. Also on all wires must be caps (except for the ON/OFF wire).
Van on filtering, de-coupling, demping, ect

=> SSD
* 12v power line => 470uF => 1 ferrite with 5 tot 6 turns (!) => 47uF => SSD
* 5v power line => 470uF => 1 ferrite with 5 tot 6 turns (!) => 47uF => SSD
Van on filtering, de-coupling, demping, ect

Note:
- use as much ferrites as you can.
The intention is to create an impedance of 500 - 1000 ohm at the targeted frequencies.
This means you need 5 to 7 ferrites in series.
Or you need to make use of turns around the ferrites too reach this.

- As the Muratta paper stresses it is important to use caps with good HF qualities.
Van on filtering, de-coupling, demping, ect

Right now I’m also experimenting with other filter methods.
Like filtering with ferrite based chokes/coils.
My first impression is: these work equally well.
More on this too come.

Mark


Edits: 08/26/11
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  • for filtering only: you don't need the 4700 bulk cap. - hfavandepas 09:52:34 08/26/11 (0)
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