[sdiy] Eurorack Power Protection

Laurie elby_designs at ozemail.com.au
Wed Jan 4 01:24:54 CET 2017

It is frustrating that there are no standards out there. For what it is 
worth, there are a group of manufacturers who are supposed to be working 
together to form a 'EuroSynth Body' but I don't think it is moving 
anywhere at the moment and is probably far too late in the day to define 
some 'proper' standards and will most likely have to try and define the 
existing figures in to a formal document so that we at least have some 
common ground to work with.

If you don't use ferrite beads then you should use a resistor of between 
10R and 22R.
The diodes as shown will force the power rails in to an 'out of 
specification' area so should not be used (certainly not in that 
10uF is ample especially given the number of modules in any system and 
the inability for some supplies to handle large inrush currents

Best Regards
Laurie Biddulph
Mobile: +61 0400 257 645
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Happy New Year

On 4/01/2017 9:35 AM, Jacob Watters wrote:
> 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?
> http://www.doepfer.de/a100_man/a100b_e.gif
> Diode
> It seems like I should just not use it?
> Resistor
> 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?
> Capacitors
> 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 
> <mailto: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/
>     <http://www.teaser.fr/%7Eamajorel/>
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