[sdiy] Choice of ferrite bead inductor

[Seb Francis]

Thanks Eric & Simon for your answers.

Seems with multi-layer SMD beads that the higher the inductance the 
lower the current capability.

So I guess I should use a different inductor for when I want good 
isolation from noisy digital power with little current needed, and for 
the general power-input inductors which need to pass more current but 
should have less noise to filter.

>
> Also, I'd recommend that you include a smaller-valued cap (0.1uf) in 
> addition to the 10uf in order to clean up the high-frequency crud.

> In agreement with Eric I would use ceramic capacitors of 100nF in 
> parallel with the electrolytics. 

Actually for the 10uF decoupling caps I was going to use X5R ceramics.

And there are a few 100nF caps scattered around.  I've shown them near 
the things they are decoupling as they will be placed physically close.  
Do you think I also need 100nF physically close to the inductor?

Seb