[sdiy] Eurorack Power Protection

Laurie elby_designs at ozemail.com.au
Tue Jan 3 22:40:44 CET 2017

All our modules incorporate filtering (we actually use ferrite beads in 
place of resistors for improved performance).
We don't see any rational logic for needing diode protection (or any 
other similar scheme) as we see this as a band-aid solution to the 
problem that is as a result of a different issue which itself, if 
corrected, would almost eliminate the problem in the first place.
And that is the matter of using boxed headers at both ends of the chain 
(busboard and module). With boxed headers and 'technically correct' 
power cables, it is impossible to reverse or mis-connect power cables.
In fact, the drawing you supplied is a prime example of a non-boxed 
header! how can you tell? The pin numbers are WRONG for P3. Pins 1 & 2 
on the IDC connector are -12V NOT pins 15 & 16!!!!!! If you use a 
'proper' power cable and plug in to a boxed header on the busboard then 
you are doomed!

Best Regards
Laurie Biddulph
Mobile: +61 0400 257 645
Phone.: +61 02 4340 0938
Web...: www.elby-designs.com
Skype.: widgetoz

Elby Designs
9 Follan Close
NSW 2250

ABN: 70 022 727 605

Happy New Year

On 4/01/2017 7:41 AM, Jacob Watters wrote:
> Do you do anything to the power rails on your modules to filter the 
> power and/or protect the module?
> Diodes? Caps? Resistors?
> Below is a link to one well protected module that was recommended to 
> me. Note that the power source is the pins on P3 and the power rails 
> are the local ones on the module (kind of confusing in this schematic 
> - it looks like the diodes are backwards).
> I know that the diodes will cause a voltage drop that will limit the 
> overhead for opamps. My module is a filter with an overdrive circuit 
> that clips at +/-5V, so overhead isn't really a concern.
> http://jacobwatters.com/images/synth/europower.png
> Thank you for your feedback and suggestions.
> Sincerely,
> Jacob Watters
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> Synth-diy at synth-diy.org
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