[sdiy] Eurorack Power Protection

Tim Ressel timr at circuitabbey.com
Tue Jan 3 23:59:34 CET 2017


The diodes are a good idea even if you used a boxed connector. They 
protect from mis-made power cables, which happens all too often.

--tr



On 1/3/2017 2:35 PM, 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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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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