[sdiy] Eurorack Power Protection

Jacob Watters jacobwatters at gmail.com
Wed Jan 4 03:57:57 CET 2017


Ok thank you very much for the feedback. I know what to do now.

You guys are all a great help. Thanks!

On Tue, Jan 3, 2017 at 9:55 PM, matt holland <matt at mattholland.org> wrote:

> I'm not a euro mfg so take this all with grain of salt.
>
> On Tue, Jan 3, 2017 at 2:35 PM, Jacob Watters <jacobwatters at gmail.com>
> 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
>>
>
> pin1 is not labeled in that image. this gets to the heart of all the red
> stripe problems.
>
>
>>
>>
>> Diode
>> It seems like I should just not use it?
>>
>
> diodes are always a good idea where it's possible to connect power
> incorrectly.
>
>
>>
>> Resistor
>> Don't use it?
>>
>
> It doesn't hurt anything, and it's nice to have series elements on power
> inputs to experiment with in case you determine filtering is needed, or for
> current measurements.
>
>
>>
>> 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?
>>
>
> If you determine you need a ferrite, you can put it in the spot that
> resistor above was using, otherwise don't worry about it.
>
>
>
>>
>> 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.
>>
>
> Caps at power entry are "bulk" caps and their value isn't critical as long
> as they are large. What is "large" would be relative to the inductance seen
> on the ribbon cable, bus board, etc and the instantaneous current draw of
> the module as a whole,  but would probably be something like 10uF or 22uF
> or higher.
>
>
>
>>
>>
>> I wish that there was a standard for this so I knew what to do :(
>>
>
> No standard required. Just pick a reasonable worst case scenario and
> design/test to that (easier said than done I know).
>
> mh
>
>
>>
>>
>> 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/
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at synth-diy.org
>>> http://synth-diy.org/mailman/listinfo/synth-diy
>>>
>>
>>
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>>
>
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