[sdiy] Eurorack Power Protection

Jacob Watters jacobwatters at gmail.com
Tue Jan 3 23:35:27 CET 2017

Thanks for all of the feedback so far. Here are my notes:

Boxed Header
This is what I plan to use. Maybe my pin umbers are off. I was going by the
image linked below. Is pin 1 on the bottom right in this image?


It seems like I should just not use it?

Don't use it?

Ferrite Bead
Some people are telling me outside this list that ferrite is more for
digital stuff and that the capacitor should be fine. If I don't use the
ferrite then should I use a resistor instead?

Only use the larger one (I use a 0.1uF bypass cap at each IC anyway). Some
say increase and some say decrease. In non-modular stuff I usually use
larger ones, so I am leaning towards 22uF.

I wish that there was a standard for this so I knew what to do :(

On Tue, Jan 3, 2017 at 4:52 PM, Andre Majorel <aym-htnys at teaser.fr> wrote:

> On 2017-01-03 12:56 -0800, Tim Ressel wrote:
> > I found a 22uF bulk cap is the minimum for noise reduction.
> > Remember the rails in Eurorack case can be noisy. 10 ohms is
> > okay for a module that pulls little current. I use 1 ohm.
> Some years ago, Tony Allgood mentioned that he had to switch
> from 22 to 2.2 µF per rail because the surge current from lots
> of 22 µF capacitors in parallel made certain Power-one supplies
> misbehave on power-up. But that was with ferrite beads, not
> resistors.
> --
> André Majorel http://www.teaser.fr/~amajorel/
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