[sdiy] Eurorack Power Protection

Kylee Kennedy kmkennedy at gmail.com
Wed Jan 4 00:25:29 CET 2017


If you're making your own power cables you should grab one of the DIY pcbs
out there that test all the wires on the ribbon cable after assembly. It's
worth it to know any build issues aren't from a missaligned power cable. I
test all my power cables now before first use.

Kylee




On Tuesday, January 3, 2017, Tim Ressel <timr at circuitabbey.com> wrote:

> 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
> <javascript:_e(%7B%7D,'cvml','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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>>
>
>
>
> _______________________________________________
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>
> --
> --Tim Ressel
> Circuit Abbeytimr at circuitabbey.com <javascript:_e(%7B%7D,'cvml','timr at circuitabbey.com');>
>
>
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